diff --git a/src/3rdparty/squirrel/squirrel/sqbaselib.cpp b/src/3rdparty/squirrel/squirrel/sqbaselib.cpp
index 1d4195bea0..c79adadfe6 100644
--- a/src/3rdparty/squirrel/squirrel/sqbaselib.cpp
+++ b/src/3rdparty/squirrel/squirrel/sqbaselib.cpp
@@ -559,7 +559,7 @@ bool _hsort_sift_down(HSQUIRRELVM v,SQArray *arr, SQInteger root, SQInteger bott
 	return true;
 }
 
-bool _hsort(HSQUIRRELVM v,SQObjectPtr &arr, SQInteger l, SQInteger r,SQInteger func)
+bool _hsort(HSQUIRRELVM v,SQObjectPtr &arr, SQInteger, SQInteger,SQInteger func)
 {
 	SQArray *a = _array(arr);
 	SQInteger i;
diff --git a/src/3rdparty/squirrel/squirrel/sqclass.cpp b/src/3rdparty/squirrel/squirrel/sqclass.cpp
index eacb0a8c5a..1e75c9ff7c 100644
--- a/src/3rdparty/squirrel/squirrel/sqclass.cpp
+++ b/src/3rdparty/squirrel/squirrel/sqclass.cpp
@@ -187,7 +187,7 @@ SQInstance::~SQInstance()
 	if(_class){ Finalize(); } //if _class is null it was already finalized by the GC
 }
 
-bool SQInstance::GetMetaMethod(SQVM *v,SQMetaMethod mm,SQObjectPtr &res)
+bool SQInstance::GetMetaMethod(SQVM *,SQMetaMethod mm,SQObjectPtr &res)
 {
 	if(type(_class->_metamethods[mm]) != OT_NULL) {
 		res = _class->_metamethods[mm];
diff --git a/src/3rdparty/squirrel/squirrel/sqobject.h b/src/3rdparty/squirrel/squirrel/sqobject.h
index 77d09301c6..d19aed1f45 100644
--- a/src/3rdparty/squirrel/squirrel/sqobject.h
+++ b/src/3rdparty/squirrel/squirrel/sqobject.h
@@ -76,7 +76,7 @@ struct SQRefCounted
 	}
 
 	/* Never used but required. */
-	inline void operator delete(void *ptr) { NOT_REACHED(); }
+	inline void operator delete(void *) { NOT_REACHED(); }
 
 private:
 	size_t size;
diff --git a/src/3rdparty/squirrel/squirrel/sqstate.cpp b/src/3rdparty/squirrel/squirrel/sqstate.cpp
index ce2fdfa55d..b9afb8b134 100644
--- a/src/3rdparty/squirrel/squirrel/sqstate.cpp
+++ b/src/3rdparty/squirrel/squirrel/sqstate.cpp
@@ -274,7 +274,7 @@ void SQSharedState::EnqueueMarkObject(SQObjectPtr &o,SQGCMarkerQueue &queue)
 }
 
 
-SQInteger SQSharedState::CollectGarbage(SQVM *vm)
+SQInteger SQSharedState::CollectGarbage(SQVM *)
 {
 	SQInteger n=0;
 	SQVM *vms = _thread(_root_vm);
diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
index b3125e8c2e..de8a5fa0b4 100644
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -119,7 +119,7 @@ struct AIConfigWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_AIC_DECREASE_NUMBER:
@@ -181,7 +181,7 @@ struct AIConfigWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_AIC_TEXTFILE && widget < WID_AIC_TEXTFILE + TFT_CONTENT_END) {
 			if (this->selected_slot == INVALID_COMPANY || AIConfig::GetConfig(this->selected_slot) == nullptr) return;
@@ -267,7 +267,7 @@ struct AIConfigWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!IsEditable(this->selected_slot)) {
 			this->selected_slot = INVALID_COMPANY;
diff --git a/src/aircraft_cmd.cpp b/src/aircraft_cmd.cpp
index ea7dad6d2e..a6c3dad2cd 100644
--- a/src/aircraft_cmd.cpp
+++ b/src/aircraft_cmd.cpp
@@ -1282,7 +1282,7 @@ void HandleMissingAircraftOrders(Aircraft *v)
 }
 
 
-TileIndex Aircraft::GetOrderStationLocation(StationID station)
+TileIndex Aircraft::GetOrderStationLocation(StationID)
 {
 	/* Orders are changed in flight, ensure going to the right station. */
 	if (this->state == FLYING) {
@@ -1599,31 +1599,31 @@ static void AircraftEventHandler_AtTerminal(Aircraft *v, const AirportFTAClass *
 	AirportMove(v, apc);
 }
 
-static void AircraftEventHandler_General(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_General(Aircraft *, const AirportFTAClass *)
 {
 	FatalError("OK, you shouldn't be here, check your Airport Scheme!");
 }
 
-static void AircraftEventHandler_TakeOff(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_TakeOff(Aircraft *v, const AirportFTAClass *)
 {
 	PlayAircraftSound(v); // play takeoffsound for airplanes
 	v->state = STARTTAKEOFF;
 }
 
-static void AircraftEventHandler_StartTakeOff(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_StartTakeOff(Aircraft *v, const AirportFTAClass *)
 {
 	v->state = ENDTAKEOFF;
 	v->UpdateDeltaXY();
 }
 
-static void AircraftEventHandler_EndTakeOff(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_EndTakeOff(Aircraft *v, const AirportFTAClass *)
 {
 	v->state = FLYING;
 	/* get the next position to go to, differs per airport */
 	AircraftNextAirportPos_and_Order(v);
 }
 
-static void AircraftEventHandler_HeliTakeOff(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_HeliTakeOff(Aircraft *v, const AirportFTAClass *)
 {
 	v->state = FLYING;
 	v->UpdateDeltaXY();
@@ -1677,7 +1677,7 @@ static void AircraftEventHandler_Flying(Aircraft *v, const AirportFTAClass *apc)
 	v->pos = apc->layout[v->pos].next_position;
 }
 
-static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *)
 {
 	v->state = ENDLANDING;
 	AircraftLandAirplane(v);  // maybe crash airplane
@@ -1690,7 +1690,7 @@ static void AircraftEventHandler_Landing(Aircraft *v, const AirportFTAClass *apc
 	}
 }
 
-static void AircraftEventHandler_HeliLanding(Aircraft *v, const AirportFTAClass *apc)
+static void AircraftEventHandler_HeliLanding(Aircraft *v, const AirportFTAClass *)
 {
 	v->state = HELIENDLANDING;
 	v->UpdateDeltaXY();
diff --git a/src/airport_gui.cpp b/src/airport_gui.cpp
index 3386f99d62..5fe50793ec 100644
--- a/src/airport_gui.cpp
+++ b/src/airport_gui.cpp
@@ -47,7 +47,7 @@ static void ShowBuildAirportPicker(Window *parent);
 
 SpriteID GetCustomAirportSprite(const AirportSpec *as, byte layout);
 
-void CcBuildAirport(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcBuildAirport(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Failed()) return;
 
@@ -102,7 +102,7 @@ struct BuildAirToolbarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -118,7 +118,7 @@ struct BuildAirToolbarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_AT_AIRPORT:
@@ -138,7 +138,7 @@ struct BuildAirToolbarWindow : Window {
 	}
 
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (this->last_user_action) {
 			case WID_AT_AIRPORT:
@@ -153,12 +153,12 @@ struct BuildAirToolbarWindow : Window {
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1 && select_proc == DDSP_DEMOLISH_AREA) {
 			GUIPlaceProcDragXY(select_proc, start_tile, end_tile);
@@ -316,7 +316,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_AP_CLASS_DROPDOWN: {
@@ -487,7 +487,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_AP_CLASS_DROPDOWN:
@@ -569,7 +569,7 @@ public:
 		this->SelectFirstAvailableAirport(false);
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		CheckRedrawStationCoverage(this);
 	}
diff --git a/src/autoreplace_gui.cpp b/src/autoreplace_gui.cpp
index afe9b65fe6..2a0f49e1c9 100644
--- a/src/autoreplace_gui.cpp
+++ b/src/autoreplace_gui.cpp
@@ -300,7 +300,7 @@ public:
 		this->sel_group = id_g;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_RV_SORT_ASCENDING_DESCENDING: {
@@ -539,7 +539,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_RV_SORT_ASCENDING_DESCENDING:
@@ -712,7 +712,7 @@ public:
 		}
 	}
 
-	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override
+	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override
 	{
 		if (widget != WID_RV_TRAIN_WAGONREMOVE_TOGGLE) return false;
 
@@ -736,7 +736,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data != 0) {
 			/* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
diff --git a/src/base_media_func.h b/src/base_media_func.h
index f83c792f92..9ea40f2de8 100644
--- a/src/base_media_func.h
+++ b/src/base_media_func.h
@@ -153,7 +153,7 @@ bool BaseSet<T, Tnum_files, Tsearch_in_tars>::FillSetDetails(IniFile *ini, const
 }
 
 template <class Tbase_set>
-bool BaseMedia<Tbase_set>::AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+bool BaseMedia<Tbase_set>::AddFile(const std::string &filename, size_t basepath_length, const std::string &)
 {
 	bool ret = false;
 	Debug(grf, 1, "Checking {} for base " SET_TYPE " set", filename);
diff --git a/src/blitter/32bpp_base.cpp b/src/blitter/32bpp_base.cpp
index a6d71998bd..eef00b404d 100644
--- a/src/blitter/32bpp_base.cpp
+++ b/src/blitter/32bpp_base.cpp
@@ -145,7 +145,7 @@ size_t Blitter_32bppBase::BufferSize(uint width, uint height)
 	return sizeof(uint32_t) * width * height;
 }
 
-void Blitter_32bppBase::PaletteAnimate(const Palette &palette)
+void Blitter_32bppBase::PaletteAnimate(const Palette &)
 {
 	/* By default, 32bpp doesn't have palette animation */
 }
diff --git a/src/blitter/32bpp_sse_func.hpp b/src/blitter/32bpp_sse_func.hpp
index f0ef4ef266..6215e093b6 100644
--- a/src/blitter/32bpp_sse_func.hpp
+++ b/src/blitter/32bpp_sse_func.hpp
@@ -154,7 +154,7 @@ static inline Colour AdjustBrightneSSE(Colour colour, uint8_t brightness)
 }
 
 GNU_TARGET(SSE_TARGET)
-static inline __m128i AdjustBrightnessOfTwoPixels(__m128i from, uint32_t brightness)
+static inline __m128i AdjustBrightnessOfTwoPixels([[maybe_unused]] __m128i from, [[maybe_unused]] uint32_t brightness)
 {
 #if (SSE_VERSION < 3)
 	NOT_REACHED();
diff --git a/src/blitter/8bpp_base.cpp b/src/blitter/8bpp_base.cpp
index ab6f0057c9..a972a27d3d 100644
--- a/src/blitter/8bpp_base.cpp
+++ b/src/blitter/8bpp_base.cpp
@@ -149,7 +149,7 @@ size_t Blitter_8bppBase::BufferSize(uint width, uint height)
 	return static_cast<size_t>(width) * height;
 }
 
-void Blitter_8bppBase::PaletteAnimate(const Palette &palette)
+void Blitter_8bppBase::PaletteAnimate(const Palette &)
 {
 	/* Video backend takes care of the palette animation */
 }
diff --git a/src/blitter/null.hpp b/src/blitter/null.hpp
index 9eec944708..26e807c061 100644
--- a/src/blitter/null.hpp
+++ b/src/blitter/null.hpp
@@ -16,19 +16,19 @@
 class Blitter_Null : public Blitter {
 public:
 	uint8_t GetScreenDepth() override { return 0; }
-	void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override {};
-	void DrawColourMappingRect(void *dst, int width, int height, PaletteID pal) override {};
+	void Draw(Blitter::BlitterParams *, BlitterMode, ZoomLevel) override {};
+	void DrawColourMappingRect(void *, int, int, PaletteID) override {};
 	Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) override;
-	void *MoveTo(void *video, int x, int y) override { return nullptr; };
-	void SetPixel(void *video, int x, int y, uint8_t colour) override {};
-	void DrawRect(void *video, int width, int height, uint8_t colour) override {};
-	void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8_t colour, int width, int dash) override {};
-	void CopyFromBuffer(void *video, const void *src, int width, int height) override {};
-	void CopyToBuffer(const void *video, void *dst, int width, int height) override {};
-	void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) override {};
-	void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) override {};
-	size_t BufferSize(uint width, uint height) override { return 0; };
-	void PaletteAnimate(const Palette &palette) override { };
+	void *MoveTo(void *, int, int) override { return nullptr; };
+	void SetPixel(void *, int, int, uint8_t) override {};
+	void DrawRect(void *, int, int, uint8_t) override {};
+	void DrawLine(void *, int, int, int, int, int, int, uint8_t, int, int) override {};
+	void CopyFromBuffer(void *, const void *, int, int) override {};
+	void CopyToBuffer(const void *, void *, int, int) override {};
+	void CopyImageToBuffer(const void *, void *, int, int, int) override {};
+	void ScrollBuffer(void *, int &, int &, int &, int &, int, int) override {};
+	size_t BufferSize(uint, uint) override { return 0; };
+	void PaletteAnimate(const Palette &) override { };
 	Blitter::PaletteAnimation UsePaletteAnimation() override { return Blitter::PALETTE_ANIMATION_NONE; };
 
 	const char *GetName() override { return "null"; }
diff --git a/src/bootstrap_gui.cpp b/src/bootstrap_gui.cpp
index 386883c1e2..9859fb6b56 100644
--- a/src/bootstrap_gui.cpp
+++ b/src/bootstrap_gui.cpp
@@ -56,7 +56,7 @@ public:
 		ResizeWindow(this, _screen.width, _screen.height);
 	}
 
-	void DrawWidget(const Rect &r, int widget) const override
+	void DrawWidget(const Rect &r, int) const override
 	{
 		GfxFillRect(r.left, r.top, r.right, r.bottom, 4, FILLRECT_OPAQUE);
 		GfxFillRect(r.left, r.top, r.right, r.bottom, 0, FILLRECT_CHECKER);
@@ -98,7 +98,7 @@ public:
 		this->Window::Close();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_BEM_MESSAGE) {
 			*size = GetStringBoundingBox(STR_MISSING_GRAPHICS_ERROR);
@@ -114,7 +114,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget == WID_BEM_QUIT) {
 			_exit_game = true;
@@ -159,7 +159,7 @@ public:
 		this->BaseNetworkContentDownloadStatusWindow::Close();
 	}
 
-	void OnDownloadComplete(ContentID cid) override
+	void OnDownloadComplete(ContentID) override
 	{
 		/* We have completed downloading. We can trigger finding the right set now. */
 		BaseGraphics::FindSets();
@@ -214,7 +214,7 @@ public:
 		this->Window::Close();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		/* We cache the button size. This is safe as no reinit can happen here. */
 		if (this->button_size.width == 0) {
@@ -244,7 +244,7 @@ public:
 		DrawStringMultiLine(r.Shrink(WidgetDimensions::scaled.frametext), STR_MISSING_GRAPHICS_SET_MESSAGE, TC_FROMSTRING, SA_CENTER);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BAFD_YES:
@@ -334,7 +334,7 @@ public:
 		EM_ASM({ if (window["openttd_bootstrap"]) openttd_bootstrap($0, $1); }, this->downloaded_bytes, this->total_bytes);
 	}
 
-	void OnDownloadProgress(const ContentInfo *ci, int bytes) override
+	void OnDownloadProgress(const ContentInfo *, int bytes) override
 	{
 		/* A negative value means we are resetting; for example, when retrying or using a fallback. */
 		if (bytes < 0) {
@@ -346,7 +346,7 @@ public:
 		EM_ASM({ if (window["openttd_bootstrap"]) openttd_bootstrap($0, $1); }, this->downloaded_bytes, this->total_bytes);
 	}
 
-	void OnDownloadComplete(ContentID cid) override
+	void OnDownloadComplete(ContentID) override
 	{
 		/* _exit_game is used to break out of the outer video driver's MainLoop. */
 		_exit_game = true;
diff --git a/src/bridge_gui.cpp b/src/bridge_gui.cpp
index 367e634411..b7f89ef975 100644
--- a/src/bridge_gui.cpp
+++ b/src/bridge_gui.cpp
@@ -50,12 +50,11 @@ typedef GUIList<BuildBridgeData> GUIBridgeList; ///< List of bridges, used in #B
  * Callback executed after a build Bridge CMD has been called
  *
  * @param result Whether the build succeeded
- * @param cmd unused
  * @param end_tile End tile of the bridge.
  * @param tile_start start tile
  * @param transport_type transport type.
  */
-void CcBuildBridge(Commands cmd, const CommandCost &result, TileIndex end_tile, TileIndex tile_start, TransportType transport_type, BridgeType, byte)
+void CcBuildBridge(Commands, const CommandCost &result, TileIndex end_tile, TileIndex tile_start, TransportType transport_type, BridgeType, byte)
 {
 	if (result.Failed()) return;
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_27_CONSTRUCTION_BRIDGE, end_tile);
@@ -175,7 +174,7 @@ public:
 		this->last_sorting = this->bridges.GetListing();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BBS_DROPDOWN_ORDER: {
@@ -212,7 +211,7 @@ public:
 		}
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		/* Position the window so hopefully the first bridge from the list is under the mouse pointer. */
 		NWidgetBase *list = this->GetWidget<NWidgetBase>(WID_BBS_BRIDGE_LIST);
@@ -244,7 +243,7 @@ public:
 		}
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		const uint8_t i = keycode - '1';
 		if (i < 9 && i < this->bridges.size()) {
@@ -256,7 +255,7 @@ public:
 		return ES_NOT_HANDLED;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			default: break;
diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
index 08f6955120..707715a28e 100644
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -1581,7 +1581,7 @@ struct BuildVehicleWindow : Window {
 		this->eng_list.RebuildDone();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BV_SORT_ASCENDING_DESCENDING:
@@ -1688,7 +1688,7 @@ struct BuildVehicleWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* When switching to original acceleration model for road vehicles, clear the selected sort criteria if it is not available now. */
@@ -1736,7 +1736,7 @@ struct BuildVehicleWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BV_LIST:
diff --git a/src/cheat_gui.cpp b/src/cheat_gui.cpp
index 37239d1339..7fa5b42fa0 100644
--- a/src/cheat_gui.cpp
+++ b/src/cheat_gui.cpp
@@ -51,11 +51,10 @@ static int32_t _money_cheat_amount = 10000000;
  * Note that the amount of money of a company must be changed through a command
  * rather than by setting a variable. Since the cheat data structure expects a
  * variable, the amount of given/taken money is used for this purpose.
- * @param new_value not used.
  * @param change_direction is -1 or +1 (down/up)
  * @return Amount of money cheat.
  */
-static int32_t ClickMoneyCheat(int32_t new_value, int32_t change_direction)
+static int32_t ClickMoneyCheat(int32_t, int32_t change_direction)
 {
 	Command<CMD_MONEY_CHEAT>::Post(Money(_money_cheat_amount) * change_direction);
 	return _money_cheat_amount;
@@ -83,10 +82,9 @@ static int32_t ClickChangeCompanyCheat(int32_t new_value, int32_t change_directi
 /**
  * Allow (or disallow) changing production of all industries.
  * @param new_value new value
- * @param change_direction unused
  * @return New value allowing change of industry production.
  */
-static int32_t ClickSetProdCheat(int32_t new_value, int32_t change_direction)
+static int32_t ClickSetProdCheat(int32_t new_value, int32_t)
 {
 	_cheats.setup_prod.value = (new_value != 0);
 	InvalidateWindowClassesData(WC_INDUSTRY_VIEW);
@@ -98,10 +96,9 @@ extern void EnginesMonthlyLoop();
 /**
  * Handle changing of the current year.
  * @param new_value The chosen year to change to.
- * @param change_direction +1 (increase) or -1 (decrease).
  * @return New year.
  */
-static int32_t ClickChangeDateCheat(int32_t new_value, int32_t change_direction)
+static int32_t ClickChangeDateCheat(int32_t new_value, int32_t)
 {
 	/* Don't allow changing to an invalid year, or the current year. */
 	auto new_year = Clamp(TimerGameCalendar::Year(new_value), CalendarTime::MIN_YEAR, CalendarTime::MAX_YEAR);
@@ -131,11 +128,10 @@ static int32_t ClickChangeDateCheat(int32_t new_value, int32_t change_direction)
 /**
  * Allow (or disallow) a change of the maximum allowed heightlevel.
  * @param new_value new value
- * @param change_direction unused
  * @return New value (or unchanged old value) of the maximum
  *         allowed heightlevel value.
  */
-static int32_t ClickChangeMaxHlCheat(int32_t new_value, int32_t change_direction)
+static int32_t ClickChangeMaxHlCheat(int32_t new_value, int32_t)
 {
 	new_value = Clamp(new_value, MIN_MAP_HEIGHT_LIMIT, MAX_MAP_HEIGHT_LIMIT);
 
@@ -301,7 +297,7 @@ struct CheatWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_C_PANEL) return;
 
@@ -347,7 +343,7 @@ struct CheatWindow : Window {
 		size->height = WidgetDimensions::scaled.framerect.Vertical() + this->line_height * lengthof(_cheats_ui);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		Rect r = this->GetWidget<NWidgetBase>(WID_C_PANEL)->GetCurrentRect().Shrink(WidgetDimensions::scaled.framerect);
 		uint btn = (pt.y - r.top) / this->line_height;
diff --git a/src/clear_cmd.cpp b/src/clear_cmd.cpp
index 6a1132ac2b..5cd00738df 100644
--- a/src/clear_cmd.cpp
+++ b/src/clear_cmd.cpp
@@ -127,7 +127,7 @@ static void DrawTile_Clear(TileInfo *ti)
 	DrawBridgeMiddle(ti);
 }
 
-static int GetSlopePixelZ_Clear(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Clear(TileIndex tile, uint x, uint y, bool)
 {
 	int z;
 	Slope tileh = GetTilePixelSlope(tile, &z);
@@ -135,7 +135,7 @@ static int GetSlopePixelZ_Clear(TileIndex tile, uint x, uint y, bool ground_vehi
 	return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
 }
 
-static Foundation GetFoundation_Clear(TileIndex tile, Slope tileh)
+static Foundation GetFoundation_Clear(TileIndex, Slope)
 {
 	return FOUNDATION_NONE;
 }
@@ -341,7 +341,7 @@ get_out:;
 	} while (--i);
 }
 
-static TrackStatus GetTileTrackStatus_Clear(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Clear(TileIndex, TransportType, uint, DiagDirection)
 {
 	return 0;
 }
@@ -365,12 +365,12 @@ static void GetTileDesc_Clear(TileIndex tile, TileDesc *td)
 	td->owner[0] = GetTileOwner(tile);
 }
 
-static void ChangeTileOwner_Clear(TileIndex tile, Owner old_owner, Owner new_owner)
+static void ChangeTileOwner_Clear(TileIndex, Owner, Owner)
 {
 	return;
 }
 
-static CommandCost TerraformTile_Clear(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
+static CommandCost TerraformTile_Clear(TileIndex tile, DoCommandFlag flags, int, Slope)
 {
 	return Command<CMD_LANDSCAPE_CLEAR>::Do(flags, tile);
 }
diff --git a/src/command.cpp b/src/command.cpp
index dfc82536c4..c2f16a55f6 100644
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -280,11 +280,10 @@ void CommandHelperBase::LogCommandExecution(Commands cmd, StringID err_message,
 /**
  * Prepare for the test run of a command proc call.
  * @param cmd_flags Command flags.
- * @param tile Tile of command execution.
  * @param[in,out] cur_company Backup of current company at start of command execution.
  * @return True if test run can go ahead, false on error.
  */
-bool CommandHelperBase::InternalExecutePrepTest(CommandFlags cmd_flags, TileIndex tile, Backup<CompanyID> &cur_company)
+bool CommandHelperBase::InternalExecutePrepTest(CommandFlags cmd_flags, TileIndex, Backup<CompanyID> &cur_company)
 {
 	/* Always execute server and spectator commands as spectator */
 	bool exec_as_spectator = (cmd_flags & (CMD_SPECTATOR | CMD_SERVER)) != 0;
@@ -314,7 +313,7 @@ bool CommandHelperBase::InternalExecutePrepTest(CommandFlags cmd_flags, TileInde
  * @param[in,out] cur_company Backup of current company at start of command execution.
  * @return True if test run can go ahead, false on error.
  */
-std::tuple<bool, bool, bool> CommandHelperBase::InternalExecuteValidateTestAndPrepExec(CommandCost &res, CommandFlags cmd_flags, bool estimate_only, bool network_command, Backup<CompanyID> &cur_company)
+std::tuple<bool, bool, bool> CommandHelperBase::InternalExecuteValidateTestAndPrepExec(CommandCost &res, CommandFlags cmd_flags, bool estimate_only, bool network_command, [[maybe_unused]] Backup<CompanyID> &cur_company)
 {
 	BasePersistentStorageArray::SwitchMode(PSM_LEAVE_TESTMODE);
 	SetTownRatingTestMode(false);
@@ -354,7 +353,7 @@ std::tuple<bool, bool, bool> CommandHelperBase::InternalExecuteValidateTestAndPr
  * @param[in,out] cur_company Backup of current company at start of command execution.
  * @return Final command result.
  */
-CommandCost CommandHelperBase::InternalExecuteProcessResult(Commands cmd, CommandFlags cmd_flags, const CommandCost &res_test, const CommandCost &res_exec, Money extra_cash, TileIndex tile, Backup<CompanyID> &cur_company)
+CommandCost CommandHelperBase::InternalExecuteProcessResult(Commands cmd, CommandFlags cmd_flags, [[maybe_unused]] const CommandCost &res_test, const CommandCost &res_exec, Money extra_cash, TileIndex tile, Backup<CompanyID> &cur_company)
 {
 	BasePersistentStorageArray::SwitchMode(PSM_LEAVE_COMMAND);
 
diff --git a/src/command_func.h b/src/command_func.h
index d10340146d..35aadb7591 100644
--- a/src/command_func.h
+++ b/src/command_func.h
@@ -257,7 +257,7 @@ public:
 protected:
 	/** Helper to process a single ClientID argument. */
 	template <class T>
-	static inline void SetClientIdHelper(T &data)
+	static inline void SetClientIdHelper([[maybe_unused]] T &data)
 	{
 		if constexpr (std::is_same_v<ClientID, T>) {
 			if (data == INVALID_CLIENT_ID) data = CLIENT_ID_SERVER;
@@ -333,7 +333,7 @@ protected:
 
 	/** Helper to process a single ClientID argument. */
 	template <class T>
-	static inline bool ClientIdIsSet(T &data)
+	static inline bool ClientIdIsSet([[maybe_unused]] T &data)
 	{
 		if constexpr (std::is_same_v<ClientID, T>) {
 			return data != INVALID_CLIENT_ID;
@@ -350,7 +350,7 @@ protected:
 	}
 
 	template<class Ttuple>
-	static inline Money ExtractAdditionalMoney(Ttuple &values)
+	static inline Money ExtractAdditionalMoney([[maybe_unused]] Ttuple &values)
 	{
 		if constexpr (std::is_same_v<std::tuple_element_t<1, Tret>, Money>) {
 			return std::get<1>(values);
@@ -359,7 +359,7 @@ protected:
 		}
 	}
 
-	static Tret Execute(StringID err_message, CommandCallback *callback, bool my_cmd, bool estimate_only, bool network_command, TileIndex tile, std::tuple<Targs...> args)
+	static Tret Execute(StringID err_message, CommandCallback *callback, bool, bool estimate_only, bool network_command, TileIndex tile, std::tuple<Targs...> args)
 	{
 		/* Prevent recursion; it gives a mess over the network */
 		RecursiveCommandCounter counter{};
diff --git a/src/company_gui.cpp b/src/company_gui.cpp
index b10c43bdbf..12c377319b 100644
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -396,7 +396,7 @@ struct CompanyFinancesWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_CF_EXPS_CATEGORY:
@@ -492,7 +492,7 @@ struct CompanyFinancesWindow : Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_CF_TOGGLE_SIZE: // toggle size
@@ -597,7 +597,7 @@ public:
 		return ScaleGUITrad(28) + WidgetDimensions::scaled.hsep_normal + GetStringBoundingBox(this->String()).width + WidgetDimensions::scaled.dropdowntext.Horizontal();
 	}
 
-	uint Height(uint width) const override
+	uint Height(uint) const override
 	{
 		return std::max(FONT_HEIGHT_NORMAL, ScaleGUITrad(12) + WidgetDimensions::scaled.vsep_normal);
 	}
@@ -607,7 +607,7 @@ public:
 		return true;
 	}
 
-	void Draw(const Rect &r, bool sel, Colours bg_colour) const override
+	void Draw(const Rect &r, bool sel, Colours) const override
 	{
 		bool rtl = _current_text_dir == TD_RTL;
 		int icon_y = CenterBounds(r.top, r.bottom, 0);
@@ -806,7 +806,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SCL_SPACER_DROPDOWN: {
@@ -977,7 +977,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			/* Livery Class buttons */
@@ -1082,7 +1082,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -1471,7 +1471,7 @@ public:
 		this->number_dim = number_dim;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SCMF_HAS_MOUSTACHE_EARRING_TEXT:
@@ -1647,7 +1647,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			/* Toggle size, advanced/simple face selection */
@@ -1909,7 +1909,7 @@ struct CompanyInfrastructureWindow : Window
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		const Company *c = Company::Get((CompanyID)this->window_number);
 
@@ -2136,7 +2136,7 @@ struct CompanyInfrastructureWindow : Window
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -2359,7 +2359,7 @@ struct CompanyWindow : Window
 		this->DrawWidgets();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_C_FACE: {
@@ -2545,7 +2545,7 @@ struct CompanyWindow : Window
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_C_NEW_FACE: DoSelectCompanyManagerFace(this); break;
@@ -2641,7 +2641,7 @@ struct CompanyWindow : Window
 		this->SetDirty();
 	}};
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		if (Command<CMD_BUILD_OBJECT>::Post(STR_ERROR_CAN_T_BUILD_COMPANY_HEADQUARTERS, tile, OBJECT_HQ, 0) && !_shift_pressed) {
 			ResetObjectToPlace();
@@ -2719,7 +2719,7 @@ struct BuyCompanyWindow : Window {
 		this->company_value = hostile_takeover ? CalculateHostileTakeoverValue(c) : c->bankrupt_value;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BC_FACE:
@@ -2764,7 +2764,7 @@ struct BuyCompanyWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BC_NO:
diff --git a/src/company_manager_face.h b/src/company_manager_face.h
index d7d94a74c4..0cd4805974 100644
--- a/src/company_manager_face.h
+++ b/src/company_manager_face.h
@@ -93,7 +93,7 @@ static_assert(lengthof(_cmf_info) == CMFV_END);
  * @pre _cmf_info[cmfv].valid_values[ge] != 0
  * @return the requested bits
  */
-static inline uint GetCompanyManagerFaceBits(CompanyManagerFace cmf, CompanyManagerFaceVariable cmfv, GenderEthnicity ge)
+static inline uint GetCompanyManagerFaceBits(CompanyManagerFace cmf, CompanyManagerFaceVariable cmfv, [[maybe_unused]] GenderEthnicity ge)
 {
 	assert(_cmf_info[cmfv].valid_values[ge] != 0);
 
@@ -108,7 +108,7 @@ static inline uint GetCompanyManagerFaceBits(CompanyManagerFace cmf, CompanyMana
  * @param val  the new value
  * @pre val < _cmf_info[cmfv].valid_values[ge]
  */
-static inline void SetCompanyManagerFaceBits(CompanyManagerFace &cmf, CompanyManagerFaceVariable cmfv, GenderEthnicity ge, uint val)
+static inline void SetCompanyManagerFaceBits(CompanyManagerFace &cmf, CompanyManagerFaceVariable cmfv, [[maybe_unused]] GenderEthnicity ge, uint val)
 {
 	assert(val < _cmf_info[cmfv].valid_values[ge]);
 
diff --git a/src/console_cmds.cpp b/src/console_cmds.cpp
index 5c773d573f..eaf2609014 100644
--- a/src/console_cmds.cpp
+++ b/src/console_cmds.cpp
@@ -86,7 +86,7 @@ public:
 static ConsoleFileList _console_file_list; ///< File storage cache for the console.
 
 /* console command defines */
-#define DEF_CONSOLE_CMD(function) static bool function(byte argc, char *argv[])
+#define DEF_CONSOLE_CMD(function) static bool function([[maybe_unused]] byte argc, [[maybe_unused]] char *argv[])
 #define DEF_CONSOLE_HOOK(function) static ConsoleHookResult function(bool echo)
 
 
diff --git a/src/console_gui.cpp b/src/console_gui.cpp
index 047f8a1780..82f70210a4 100644
--- a/src/console_gui.cpp
+++ b/src/console_gui.cpp
@@ -200,7 +200,7 @@ struct IConsoleWindow : Window
 		if (_iconsole_cmdline.HandleCaret()) this->SetDirty();
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		if (_focused_window != this) return ES_NOT_HANDLED;
 
@@ -271,7 +271,7 @@ struct IConsoleWindow : Window
 		return ES_HANDLED;
 	}
 
-	void InsertTextString(int wid, const char *str, bool marked, const char *caret, const char *insert_location, const char *replacement_end) override
+	void InsertTextString(int, const char *str, bool marked, const char *caret, const char *insert_location, const char *replacement_end) override
 	{
 		if (_iconsole_cmdline.InsertString(str, marked, caret, insert_location, replacement_end)) {
 			IConsoleWindow::scroll = 0;
@@ -323,7 +323,7 @@ struct IConsoleWindow : Window
 		VideoDriver::GetInstance()->EditBoxGainedFocus();
 	}
 
-	void OnFocusLost(bool closing) override
+	void OnFocusLost(bool) override
 	{
 		VideoDriver::GetInstance()->EditBoxLostFocus();
 	}
diff --git a/src/core/pool_type.hpp b/src/core/pool_type.hpp
index 63278c8d17..11190bdc00 100644
--- a/src/core/pool_type.hpp
+++ b/src/core/pool_type.hpp
@@ -275,13 +275,12 @@ struct Pool : PoolBase {
 
 		/**
 		 * Allocates space for new Titem at given memory address
-		 * @param size size of Titem
 		 * @param ptr where are we allocating the item?
 		 * @return pointer to allocated memory (== ptr)
 		 * @note use of this is strongly discouraged
 		 * @pre the memory must not be allocated in the Pool!
 		 */
-		inline void *operator new(size_t size, void *ptr)
+		inline void *operator new(size_t, void *ptr)
 		{
 			for (size_t i = 0; i < Tpool->first_unused; i++) {
 				/* Don't allow creating new objects over existing.
@@ -375,7 +374,7 @@ struct Pool : PoolBase {
 		 * @note when this function is called, PoolItem::Get(index) == nullptr.
 		 * @note it's called only when !CleaningPool()
 		 */
-		static inline void PostDestructor(size_t index) { }
+		static inline void PostDestructor([[maybe_unused]] size_t index) { }
 
 		/**
 		 * Returns an iterable ensemble of all valid Titem
diff --git a/src/cpu.cpp b/src/cpu.cpp
index 7de424e3d8..239c0e2347 100644
--- a/src/cpu.cpp
+++ b/src/cpu.cpp
@@ -155,7 +155,7 @@ void ottd_cpuid(int info[4], int type)
 	}
 }
 #else
-void ottd_cpuid(int info[4], int type)
+void ottd_cpuid(int info[4], int)
 {
 	info[0] = info[1] = info[2] = info[3] = 0;
 }
diff --git a/src/date_gui.cpp b/src/date_gui.cpp
index 9d94e154da..cb111f50ab 100644
--- a/src/date_gui.cpp
+++ b/src/date_gui.cpp
@@ -55,7 +55,7 @@ struct SetDateWindow : Window {
 		this->date.year = Clamp(this->date.year, min_year, max_year);
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = { this->parent->left + this->parent->width / 2 - sm_width / 2, this->parent->top + this->parent->height / 2 - sm_height / 2 };
 		return pt;
@@ -99,7 +99,7 @@ struct SetDateWindow : Window {
 		ShowDropDownList(this, std::move(list), selected, widget);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		Dimension d = {0, 0};
 		switch (widget) {
@@ -137,7 +137,7 @@ struct SetDateWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SD_DAY:
diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index 28d5d6ea11..4ed3df4bde 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -117,11 +117,10 @@ extern void DepotSortList(VehicleList *list);
 
 /**
  * This is the Callback method after the cloning attempt of a vehicle
- * @param cmd unused
  * @param result the result of the cloning command
  * @param veh_id cloned vehicle ID
  */
-void CcCloneVehicle(Commands cmd, const CommandCost &result, VehicleID veh_id)
+void CcCloneVehicle(Commands, const CommandCost &result, VehicleID veh_id)
 {
 	if (result.Failed()) return;
 
@@ -656,7 +655,7 @@ struct DepotWindow : Window {
 		this->flag_size = maxdim(GetScaledSpriteSize(SPR_FLAG_VEH_STOPPED), GetScaledSpriteSize(SPR_FLAG_VEH_RUNNING));
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_D_MATRIX: {
@@ -704,7 +703,7 @@ struct DepotWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		this->generate_list = true;
 	}
@@ -760,7 +759,7 @@ struct DepotWindow : Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_D_MATRIX: // List
@@ -842,7 +841,7 @@ struct DepotWindow : Window {
 		Command<CMD_RENAME_DEPOT>::Post(STR_ERROR_CAN_T_RENAME_DEPOT, this->GetDepotIndex(), str);
 	}
 
-	bool OnRightClick(Point pt, int widget) override
+	bool OnRightClick([[maybe_unused]] Point pt, int widget) override
 	{
 		if (widget != WID_D_MATRIX) return false;
 
diff --git a/src/disaster_vehicle.cpp b/src/disaster_vehicle.cpp
index 4aa5549c83..fed432fdc4 100644
--- a/src/disaster_vehicle.cpp
+++ b/src/disaster_vehicle.cpp
@@ -690,7 +690,7 @@ static bool DisasterTick_Submarine(DisasterVehicle *v)
 }
 
 
-static bool DisasterTick_NULL(DisasterVehicle *v)
+static bool DisasterTick_NULL(DisasterVehicle *)
 {
 	return true;
 }
diff --git a/src/dock_gui.cpp b/src/dock_gui.cpp
index ee3446e7ba..9c0d9b61d9 100644
--- a/src/dock_gui.cpp
+++ b/src/dock_gui.cpp
@@ -45,7 +45,7 @@ static void ShowBuildDocksDepotPicker(Window *parent);
 
 static Axis _ship_depot_direction;
 
-void CcBuildDocks(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcBuildDocks(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Failed()) return;
 
@@ -53,7 +53,7 @@ void CcBuildDocks(Commands cmd, const CommandCost &result, TileIndex tile)
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
 }
 
-void CcPlaySound_CONSTRUCTION_WATER(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcPlaySound_CONSTRUCTION_WATER(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_02_CONSTRUCTION_WATER, tile);
 }
@@ -120,7 +120,7 @@ struct BuildDocksToolbarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -148,7 +148,7 @@ struct BuildDocksToolbarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_DT_CANAL: // Build canal button
@@ -189,7 +189,7 @@ struct BuildDocksToolbarWindow : Window {
 		this->last_clicked_widget = (DockToolbarWidgets)widget;
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (this->last_clicked_widget) {
 			case WID_DT_CANAL: // Build canal button
@@ -242,12 +242,12 @@ struct BuildDocksToolbarWindow : Window {
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1) {
 			switch (select_proc) {
@@ -278,7 +278,7 @@ struct BuildDocksToolbarWindow : Window {
 		CloseWindowByClass(WC_BUILD_BRIDGE);
 	}
 
-	void OnPlacePresize(Point pt, TileIndex tile_from) override
+	void OnPlacePresize([[maybe_unused]] Point pt, TileIndex tile_from) override
 	{
 		TileIndex tile_to = tile_from;
 
@@ -453,7 +453,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case BDSW_LT_OFF:
@@ -468,7 +468,7 @@ public:
 		}
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		CheckRedrawStationCoverage(this);
 	}
@@ -525,7 +525,7 @@ public:
 		UpdateDocksDirection();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BDD_X:
@@ -559,7 +559,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BDD_X:
diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
index ea580ffe31..3d1cf12781 100644
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -77,7 +77,7 @@ struct EnginePreviewWindow : Window {
 		this->flags |= WF_STICKY;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_EP_QUESTION) return;
 
@@ -122,7 +122,7 @@ struct EnginePreviewWindow : Window {
 		DrawStringMultiLine(r.left, r.right, y, r.bottom, GetEngineInfoString(engine), TC_FROMSTRING, SA_CENTER);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_EP_YES:
@@ -134,7 +134,7 @@ struct EnginePreviewWindow : Window {
 		}
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
diff --git a/src/error_gui.cpp b/src/error_gui.cpp
index 2aacc1eed8..94ac9c7461 100644
--- a/src/error_gui.cpp
+++ b/src/error_gui.cpp
@@ -188,7 +188,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_EM_MESSAGE: {
@@ -217,7 +217,7 @@ public:
 		}
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		/* Position (0, 0) given, center the window. */
 		if (this->position.x == 0 && this->position.y == 0) {
@@ -253,7 +253,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		/* If company gets shut down, while displaying an error about it, remove the error message. */
 		if (this->face != INVALID_COMPANY && !Company::IsValidID(this->face)) this->Close();
diff --git a/src/fileio.cpp b/src/fileio.cpp
index 7e69db0316..e090820e3c 100644
--- a/src/fileio.cpp
+++ b/src/fileio.cpp
@@ -474,7 +474,7 @@ static std::string ExtractString(char *buffer, size_t buffer_length)
 	return StrMakeValid(std::string(buffer, length));
 }
 
-bool TarScanner::AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+bool TarScanner::AddFile(const std::string &filename, size_t, [[maybe_unused]] const std::string &tar_filename)
 {
 	/* No tar within tar. */
 	assert(tar_filename.empty());
diff --git a/src/fios.cpp b/src/fios.cpp
index c2becb25f1..8e150daafd 100644
--- a/src/fios.cpp
+++ b/src/fios.cpp
@@ -275,10 +275,9 @@ public:
 /**
  * Try to add a fios item set with the given filename.
  * @param filename        the full path to the file to read
- * @param basepath_length amount of characters to chop of before to get a relative filename
  * @return true if the file is added.
  */
-bool FiosFileScanner::AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+bool FiosFileScanner::AddFile(const std::string &filename, size_t, const std::string &)
 {
 	auto sep = filename.rfind('.');
 	if (sep == std::string::npos) return false;
@@ -531,7 +530,7 @@ void FiosGetScenarioList(SaveLoadOperation fop, FileList &file_list)
 	FiosGetFileList(fop, &FiosGetScenarioListCallback, subdir, file_list);
 }
 
-static std::tuple<FiosType, std::string> FiosGetHeightmapListCallback(SaveLoadOperation fop, const std::string &file, const std::string_view ext)
+static std::tuple<FiosType, std::string> FiosGetHeightmapListCallback(SaveLoadOperation, const std::string &file, const std::string_view ext)
 {
 	/* Show heightmap files
 	 * .PNG PNG Based heightmap files
@@ -640,7 +639,7 @@ public:
 		this->scanned = true;
 	}
 
-	bool AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename) override
+	bool AddFile(const std::string &filename, size_t, const std::string &) override
 	{
 		FILE *f = FioFOpenFile(filename, "r", SCENARIO_DIR);
 		if (f == nullptr) return false;
@@ -729,7 +728,7 @@ FiosNumberedSaveName::FiosNumberedSaveName(const std::string &prefix) : prefix(p
 	static std::string _prefix; ///< Static as the lambda needs access to it.
 
 	/* Callback for FiosFileScanner. */
-	static FiosGetTypeAndNameProc *proc = [](SaveLoadOperation fop, const std::string &file, const std::string_view ext) {
+	static FiosGetTypeAndNameProc *proc = [](SaveLoadOperation, const std::string &file, const std::string_view ext) {
 		if (StrEqualsIgnoreCase(ext, ".sav") && StrStartsWith(file, _prefix)) return std::tuple(FIOS_TYPE_FILE, std::string{});
 		return std::tuple(FIOS_TYPE_INVALID, std::string{});
 	};
diff --git a/src/fios_gui.cpp b/src/fios_gui.cpp
index 8eb5c7255a..9b7820edcf 100644
--- a/src/fios_gui.cpp
+++ b/src/fios_gui.cpp
@@ -282,13 +282,13 @@ private:
 	QueryString filter_editbox; ///< Filter editbox;
 	std::vector<FiosItem *> display_list; ///< Filtered display list
 
-	static void SaveGameConfirmationCallback(Window *w, bool confirmed)
+	static void SaveGameConfirmationCallback(Window *, bool confirmed)
 	{
 		/* File name has already been written to _file_to_saveload */
 		if (confirmed) _switch_mode = SM_SAVE_GAME;
 	}
 
-	static void SaveHeightmapConfirmationCallback(Window *w, bool confirmed)
+	static void SaveHeightmapConfirmationCallback(Window *, bool confirmed)
 	{
 		/* File name has already been written to _file_to_saveload */
 		if (confirmed) _switch_mode = SM_SAVE_HEIGHTMAP;
@@ -561,7 +561,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SL_BACKGROUND:
@@ -594,7 +594,7 @@ public:
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SL_SORT_BYNAME: // Sort save names by name
@@ -716,7 +716,7 @@ public:
 		}
 	}
 
-	void OnMouseOver(Point pt, int widget) override
+	void OnMouseOver([[maybe_unused]] Point pt, int widget) override
 	{
 		if (widget == WID_SL_DRIVES_DIRECTORIES_LIST) {
 			auto it = this->vscroll->GetScrolledItemFromWidget(this->display_list, pt.y, this, WID_SL_DRIVES_DIRECTORIES_LIST, WidgetDimensions::scaled.inset.top);
@@ -735,7 +735,7 @@ public:
 		}
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		if (keycode == WKC_ESC) {
 			this->Close();
diff --git a/src/fontcache.cpp b/src/fontcache.cpp
index 096d5eddde..ce5dffe6a4 100644
--- a/src/fontcache.cpp
+++ b/src/fontcache.cpp
@@ -204,5 +204,5 @@ bool HasAntialiasedFonts()
 
 #if !defined(_WIN32) && !defined(__APPLE__) && !defined(WITH_FONTCONFIG) && !defined(WITH_COCOA)
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int winlangid, MissingGlyphSearcher *callback) { return false; }
+bool SetFallbackFont(FontCacheSettings *, const std::string &, int, MissingGlyphSearcher *) { return false; }
 #endif /* !defined(_WIN32) && !defined(__APPLE__) && !defined(WITH_FONTCONFIG) && !defined(WITH_COCOA) */
diff --git a/src/fontcache/freetypefontcache.cpp b/src/fontcache/freetypefontcache.cpp
index 19da21bbe5..bb6f282d0e 100644
--- a/src/fontcache/freetypefontcache.cpp
+++ b/src/fontcache/freetypefontcache.cpp
@@ -63,7 +63,7 @@ FreeTypeFontCache::FreeTypeFontCache(FontSize fs, FT_Face face, int pixels) : Tr
 	this->SetFontSize(fs, face, pixels);
 }
 
-void FreeTypeFontCache::SetFontSize(FontSize fs, FT_Face face, int pixels)
+void FreeTypeFontCache::SetFontSize(FontSize, FT_Face, int pixels)
 {
 	if (pixels == 0) {
 		/* Try to determine a good height based on the minimal height recommended by the font. */
diff --git a/src/fontcache/spritefontcache.h b/src/fontcache/spritefontcache.h
index 6693119f06..4e710c1a93 100644
--- a/src/fontcache/spritefontcache.h
+++ b/src/fontcache/spritefontcache.h
@@ -30,7 +30,7 @@ public:
 	virtual uint GetGlyphWidth(GlyphID key);
 	virtual bool GetDrawGlyphShadow();
 	virtual GlyphID MapCharToGlyph(char32_t key) { assert(IsPrintable(key)); return SPRITE_GLYPH | key; }
-	virtual const void *GetFontTable(uint32_t tag, size_t &length) { length = 0; return nullptr; }
+	const void *GetFontTable(uint32_t, size_t &length) override { length = 0; return nullptr; }
 	virtual std::string GetFontName() { return "sprite"; }
 	virtual bool IsBuiltInFont() { return true; }
 };
diff --git a/src/framerate_gui.cpp b/src/framerate_gui.cpp
index 453d9f142f..40fbaf387c 100644
--- a/src/framerate_gui.cpp
+++ b/src/framerate_gui.cpp
@@ -460,7 +460,7 @@ struct FramerateWindow : Window {
 		ResizeWindow(this, 0, (std::max(MIN_ELEMENTS, this->num_displayed) - MIN_ELEMENTS) * FONT_HEIGHT_NORMAL);
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		/* Check if the shaded state has changed, switch caption text if it has */
 		if (this->small != this->IsShaded()) {
@@ -540,7 +540,7 @@ struct FramerateWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_FRW_RATE_GAMELOOP:
@@ -693,7 +693,7 @@ struct FramerateWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_FRW_TIMES_NAMES:
@@ -780,7 +780,7 @@ struct FrametimeGraphWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_FGW_GRAPH) {
 			SetDParam(0, 100);
@@ -883,7 +883,7 @@ struct FrametimeGraphWindow : Window {
 		this->UpdateScale();
 	}};
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		this->SetDirty();
 	}
diff --git a/src/game/game_gui.cpp b/src/game/game_gui.cpp
index 6a1c89596d..e2142da061 100644
--- a/src/game/game_gui.cpp
+++ b/src/game/game_gui.cpp
@@ -130,7 +130,7 @@ struct GSConfigWindow : public Window {
 		this->vscroll->SetCount(this->visible_settings.size());
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_GSC_SETTINGS:
@@ -238,7 +238,7 @@ struct GSConfigWindow : public Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_GSC_TEXTFILE && widget < WID_GSC_TEXTFILE + TFT_CONTENT_END) {
 			if (GameConfig::GetConfig() == nullptr) return;
@@ -371,7 +371,7 @@ struct GSConfigWindow : public Window {
 		SetValue(index);
 	}
 
-	void OnDropdownClose(Point pt, int widget, int index, bool instant_close) override
+	void OnDropdownClose(Point, int widget, int, bool) override
 	{
 		/* We cannot raise the dropdown button just yet. OnClick needs some hint, whether
 		 * the same dropdown button was clicked again, and then not open the dropdown again.
@@ -398,7 +398,7 @@ struct GSConfigWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
diff --git a/src/game/game_text.cpp b/src/game/game_text.cpp
index 34feb8f119..7c9b900a6d 100644
--- a/src/game/game_text.cpp
+++ b/src/game/game_text.cpp
@@ -121,7 +121,7 @@ struct TranslationWriter : LanguageWriter {
 	{
 	}
 
-	void WriteHeader(const LanguagePackHeader *header)
+	void WriteHeader(const LanguagePackHeader *)
 	{
 		/* We don't use the header. */
 	}
@@ -131,7 +131,7 @@ struct TranslationWriter : LanguageWriter {
 		/* Nothing to do. */
 	}
 
-	void WriteLength(uint length)
+	void WriteLength(uint)
 	{
 		/* We don't write the length. */
 	}
@@ -159,7 +159,7 @@ struct StringNameWriter : HeaderWriter {
 		if (stringid == (int)this->strings.size()) this->strings.emplace_back(name);
 	}
 
-	void Finalise(const StringData &data)
+	void Finalise(const StringData &)
 	{
 		/* Nothing to do. */
 	}
@@ -185,7 +185,7 @@ public:
 		this->FileScanner::Scan(".txt", directory, false);
 	}
 
-	bool AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename) override
+	bool AddFile(const std::string &filename, size_t, const std::string &) override
 	{
 		if (exclude == filename) return true;
 
diff --git a/src/gamelog.cpp b/src/gamelog.cpp
index a0e7d63bff..6ed62159df 100644
--- a/src/gamelog.cpp
+++ b/src/gamelog.cpp
@@ -168,13 +168,13 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 }
 
 
-/* virtual */ void LoggedChangeMode::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeMode::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &, GamelogActionType)
 {
 	/* Changing landscape, or going from scenario editor to game or back. */
 	fmt::format_to(output_iterator, "New game mode: {} landscape: {}", this->mode, this->landscape);
 }
 
-/* virtual */ void LoggedChangeRevision::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeRevision::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &, GamelogActionType)
 {
 	/* The game was loaded in a diffferent version than before. */
 	fmt::format_to(output_iterator, "Revision text changed to {}, savegame version {}, ",
@@ -189,7 +189,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	fmt::format_to(output_iterator, "modified, _openttd_newgrf_version = 0x{:08x}", this->newgrf);
 }
 
-/* virtual */ void LoggedChangeOldVersion::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeOldVersion::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &, GamelogActionType)
 {
 	/* The game was loaded from before 0.7.0-beta1. */
 	fmt::format_to(output_iterator, "Conversion from ");
@@ -221,13 +221,13 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	}
 }
 
-/* virtual */ void LoggedChangeSettingChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeSettingChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &, GamelogActionType)
 {
 	/* A setting with the SF_NO_NETWORK flag got changed; these settings usually affect NewGRFs, such as road side or wagon speed limits. */
 	fmt::format_to(output_iterator, "Setting changed: {} : {} -> {}", this->name, this->oldval, this->newval);
 }
 
-/* virtual */ void LoggedChangeGRFAdd::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeGRFAdd::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType)
 {
 	/* A NewGRF got added to the game, either at the start of the game (never an issue), or later on when it could be an issue. */
 	const GRFConfig *gc = FindGRFConfig(this->grfid, FGCM_EXACT, &this->md5sum);
@@ -256,7 +256,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	}
 }
 
-/* virtual */ void LoggedChangeGRFChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeGRFChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType)
 {
 	/* Another version of the same NewGRF got loaded. */
 	const GRFConfig *gc = FindGRFConfig(this->grfid, FGCM_EXACT, &this->md5sum);
@@ -266,7 +266,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	grf_names[this->grfid] = gc;
 }
 
-/* virtual */ void LoggedChangeGRFParameterChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeGRFParameterChanged::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType)
 {
 	/* A parameter of a NewGRF got changed after the game was started. */
 	auto gm = grf_names.find(this->grfid);
@@ -275,7 +275,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	if (gm == grf_names.end()) fmt::format_to(output_iterator, ". Gamelog inconsistency: GrfID was never added!");
 }
 
-/* virtual */ void LoggedChangeGRFMoved::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeGRFMoved::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType)
 {
 	/* The order of NewGRFs got changed, which might cause some other NewGRFs to behave differently. */
 	auto gm = grf_names.find(this->grfid);
@@ -285,7 +285,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	if (gm == grf_names.end()) fmt::format_to(output_iterator, ". Gamelog inconsistency: GrfID was never added!");
 }
 
-/* virtual */ void LoggedChangeGRFBug::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeGRFBug::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType)
 {
 	/* A specific bug in a NewGRF, that could cause wide spread problems, has been noted during the execution of the game. */
 	auto gm = grf_names.find(this->grfid);
@@ -296,7 +296,7 @@ void Gamelog::Print(std::function<void(const std::string &)> proc)
 	if (gm == grf_names.end()) fmt::format_to(output_iterator, ". Gamelog inconsistency: GrfID was never added!");
 }
 
-/* virtual */ void LoggedChangeEmergencySave::FormatTo(std::back_insert_iterator<std::string> &output_iterator, GrfIDMapping &grf_names, GamelogActionType action_type)
+/* virtual */ void LoggedChangeEmergencySave::FormatTo(std::back_insert_iterator<std::string> &, GrfIDMapping &, GamelogActionType)
 {
 	/* At one point the savegame was made during the handling of a game crash.
 	 * The generic code already mentioned the emergency savegame, and there is no extra information to log. */
diff --git a/src/genworld_gui.cpp b/src/genworld_gui.cpp
index 5dbd1c59b0..8c2ebefb00 100644
--- a/src/genworld_gui.cpp
+++ b/src/genworld_gui.cpp
@@ -520,7 +520,7 @@ struct GenerateLandscapeWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* Update the climate buttons */
@@ -588,7 +588,7 @@ struct GenerateLandscapeWindow : public Window {
 
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		Dimension d{0, (uint)FONT_HEIGHT_NORMAL};
 		const StringID *strs = nullptr;
@@ -681,7 +681,7 @@ struct GenerateLandscapeWindow : public Window {
 		*size = maxdim(*size, d);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GL_TEMPERATE:
@@ -1132,7 +1132,7 @@ struct CreateScenarioWindow : public Window
 		this->DrawWidgets();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		StringID str = STR_JUST_INT;
 		switch (widget) {
@@ -1159,7 +1159,7 @@ struct CreateScenarioWindow : public Window
 		*size = maxdim(*size, d);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_CS_TEMPERATE:
@@ -1372,7 +1372,7 @@ static const StringID _generation_class_table[]  = {
 static_assert(lengthof(_generation_class_table) == GWP_CLASS_COUNT);
 
 
-static void AbortGeneratingWorldCallback(Window *w, bool confirmed)
+static void AbortGeneratingWorldCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		AbortGeneratingWorld();
@@ -1388,7 +1388,7 @@ struct GenerateProgressWindow : public Window {
 		this->InitNested();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GP_ABORT:
@@ -1403,7 +1403,7 @@ struct GenerateProgressWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_GP_PROGRESS_BAR: {
diff --git a/src/gfx_layout_fallback.cpp b/src/gfx_layout_fallback.cpp
index 7982317e63..1b3d020ac4 100644
--- a/src/gfx_layout_fallback.cpp
+++ b/src/gfx_layout_fallback.cpp
@@ -65,7 +65,7 @@ public:
 		int CountRuns() const override;
 		const ParagraphLayouter::VisualRun &GetVisualRun(int run) const override;
 
-		int GetInternalCharLength(char32_t c) const override { return 1; }
+		int GetInternalCharLength(char32_t) const override { return 1; }
 	};
 
 	const char32_t *buffer_begin; ///< Begin of the buffer.
@@ -265,7 +265,7 @@ const ParagraphLayouter::VisualRun &FallbackParagraphLayout::FallbackLine::GetVi
  * @param length The length of the paragraph.
  * @param runs   The font mapping of this paragraph.
  */
-FallbackParagraphLayout::FallbackParagraphLayout(char32_t *buffer, int length, FontMap &runs) : buffer_begin(buffer), buffer(buffer), runs(runs)
+FallbackParagraphLayout::FallbackParagraphLayout(char32_t *buffer, [[maybe_unused]] int length, FontMap &runs) : buffer_begin(buffer), buffer(buffer), runs(runs)
 {
 	assert(runs.rbegin()->first == length);
 }
diff --git a/src/goal_gui.cpp b/src/goal_gui.cpp
index 9ff4a32738..f1e30b6205 100644
--- a/src/goal_gui.cpp
+++ b/src/goal_gui.cpp
@@ -63,7 +63,7 @@ struct GoalListWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GOAL_GLOBAL_BUTTON:
@@ -168,7 +168,7 @@ struct GoalListWindow : public Window {
 		return num;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_GOAL_LIST) return;
 		Dimension d = GetStringBoundingBox(STR_GOALS_NONE);
@@ -269,7 +269,7 @@ struct GoalListWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->vscroll->SetCount(this->CountLines());
@@ -370,7 +370,7 @@ struct GoalQuestionWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GQ_BUTTON_1:
@@ -390,7 +390,7 @@ struct GoalQuestionWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_GQ_QUESTION) return;
 
diff --git a/src/graph_gui.cpp b/src/graph_gui.cpp
index 57f1e80949..c17a916233 100644
--- a/src/graph_gui.cpp
+++ b/src/graph_gui.cpp
@@ -76,7 +76,7 @@ struct GraphLegendWindow : Window {
 		DrawString(tr.left, tr.right, CenterBounds(tr.top, tr.bottom, FONT_HEIGHT_NORMAL), STR_COMPANY_NAME_COMPANY_NUM, HasBit(_legend_excluded_companies, cid) ? TC_BLACK : TC_WHITE);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (!IsInsideMM(widget, WID_GL_FIRST_COMPANY, MAX_COMPANIES + WID_GL_FIRST_COMPANY)) return;
 
@@ -95,7 +95,7 @@ struct GraphLegendWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (Company::IsValidID(data)) return;
@@ -493,7 +493,7 @@ protected:
 	}
 
 public:
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != this->graph_widget) return;
 
@@ -536,12 +536,12 @@ public:
 		DrawGraph(r);
 	}
 
-	virtual OverflowSafeInt64 GetGraphData(const Company *c, int j)
+	virtual OverflowSafeInt64 GetGraphData(const Company *, int)
 	{
 		return INVALID_DATAPOINT;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		/* Clicked on legend? */
 		if (widget == WID_CV_KEY_BUTTON) ShowGraphLegend();
@@ -557,7 +557,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->UpdateStatistics(true);
@@ -782,7 +782,7 @@ struct PerformanceHistoryGraphWindow : BaseGraphWindow {
 		return c->old_economy[j].performance_history;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget == WID_PHG_DETAILED_PERFORMANCE) ShowPerformanceRatingDetail();
 		this->BaseGraphWindow::OnClick(pt, widget, click_count);
@@ -916,7 +916,7 @@ struct PaymentRatesGraphWindow : BaseGraphWindow {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_CPR_MATRIX) {
 			BaseGraphWindow::UpdateWidgetSize(widget, size, padding, fill, resize);
@@ -975,7 +975,7 @@ struct PaymentRatesGraphWindow : BaseGraphWindow {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_CPR_ENABLE_CARGOES:
@@ -1025,7 +1025,7 @@ struct PaymentRatesGraphWindow : BaseGraphWindow {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->UpdatePaymentRates();
@@ -1142,7 +1142,7 @@ struct PerformanceRatingDetailWindow : Window {
 	uint score_detail_left;
 	uint score_detail_right;
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_PRD_SCORE_FIRST:
@@ -1279,7 +1279,7 @@ struct PerformanceRatingDetailWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		/* Check which button is clicked */
 		if (IsInsideMM(widget, WID_PRD_COMPANY_FIRST, WID_PRD_COMPANY_LAST + 1)) {
@@ -1307,7 +1307,7 @@ struct PerformanceRatingDetailWindow : Window {
 	 * @param data the company ID of the company that is going to be removed
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* Disable the companies who are not active */
diff --git a/src/group_gui.cpp b/src/group_gui.cpp
index cc7992497c..c52153fe2f 100644
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -384,7 +384,7 @@ public:
 		*this->sorting = this->vehgroups.GetListing();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_GL_LIST_GROUP:
@@ -442,7 +442,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == 0) {
 			/* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
@@ -651,7 +651,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GL_SORT_BY_ORDER: // Flip sorting method ascending/descending
@@ -1169,14 +1169,12 @@ static void CcCreateGroup(GroupID gid, VehicleType veh_type)
 
 /**
  * Opens a 'Rename group' window for newly created group.
- * @param cmd Unused.
  * @param result Did command succeed?
  * @param new_group ID of the created group.
  * @param vt Vehicle type.
- * @param parent_group Parent group of the new group.
  * @see CmdCreateGroup
  */
-void CcCreateGroup(Commands cmd, const CommandCost &result, GroupID new_group, VehicleType vt, GroupID parent_group)
+void CcCreateGroup(Commands, const CommandCost &result, GroupID new_group, VehicleType vt, GroupID)
 {
 	if (result.Failed()) return;
 
@@ -1186,12 +1184,10 @@ void CcCreateGroup(Commands cmd, const CommandCost &result, GroupID new_group, V
 
 /**
  * Open rename window after adding a vehicle to a new group via drag and drop.
- * @param cmd Unused.
  * @param result Did command succeed?
  * @param new_group ID of the created group.
- * @param veh_id vehicle to add to a group
  */
-void CcAddVehicleNewGroup(Commands cmd, const CommandCost &result, GroupID new_group, GroupID, VehicleID veh_id, bool, const VehicleListIdentifier &)
+void CcAddVehicleNewGroup(Commands, const CommandCost &result, GroupID new_group, GroupID, VehicleID, bool, const VehicleListIdentifier &)
 {
 	if (result.Failed()) return;
 
diff --git a/src/help_gui.cpp b/src/help_gui.cpp
index d575725cdb..5c052af917 100644
--- a/src/help_gui.cpp
+++ b/src/help_gui.cpp
@@ -129,7 +129,7 @@ struct HelpWindow : public Window {
 		this->EnableTextfileButton(LICENSE_FILENAME, WID_HW_LICENSE);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_HW_README:
diff --git a/src/highscore_gui.cpp b/src/highscore_gui.cpp
index 4b55d65586..7989b6071f 100644
--- a/src/highscore_gui.cpp
+++ b/src/highscore_gui.cpp
@@ -65,12 +65,12 @@ struct EndGameHighScoreBaseWindow : Window {
 		return pt;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, [[maybe_unused]] int widget, [[maybe_unused]] int click_count) override
 	{
 		this->Close();
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		/* All keys are 'handled' by this window but we want to make
 		 * sure that 'quit' still works correctly. Not handling the
diff --git a/src/hotkeys.cpp b/src/hotkeys.cpp
index d1374e86e1..478d2ca233 100644
--- a/src/hotkeys.cpp
+++ b/src/hotkeys.cpp
@@ -348,7 +348,7 @@ void SaveHotkeysToConfig()
 	SaveLoadHotkeys(true);
 }
 
-void HandleGlobalHotkeys(char32_t key, uint16_t keycode)
+void HandleGlobalHotkeys([[maybe_unused]] char32_t key, uint16_t keycode)
 {
 	for (HotkeyList *list : *_hotkey_lists) {
 		if (list->global_hotkey_handler == nullptr) continue;
diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index 6d5f17e6ac..64d69988db 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -206,7 +206,7 @@ Industry::~Industry()
  * Invalidating some stuff after removing item from the pool.
  * @param index index of deleted item
  */
-void Industry::PostDestructor(size_t index)
+void Industry::PostDestructor(size_t)
 {
 	InvalidateWindowData(WC_INDUSTRY_DIRECTORY, 0, IDIWD_FORCE_REBUILD);
 	SetWindowDirty(WC_BUILD_INDUSTRY, 0);
@@ -385,7 +385,7 @@ static void DrawTile_Industry(TileInfo *ti)
 	}
 }
 
-static int GetSlopePixelZ_Industry(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Industry(TileIndex tile, uint, uint, bool)
 {
 	return GetTileMaxPixelZ(tile);
 }
@@ -952,7 +952,7 @@ static bool ClickTile_Industry(TileIndex tile)
 	return true;
 }
 
-static TrackStatus GetTileTrackStatus_Industry(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Industry(TileIndex, TransportType, uint, DiagDirection)
 {
 	return 0;
 }
@@ -1094,10 +1094,9 @@ void PlantRandomFarmField(const Industry *i)
 /**
  * Search callback function for ChopLumberMillTrees
  * @param tile to test
- * @param user_data that is passed by the caller.  In this case, nothing
  * @return the result of the test
  */
-static bool SearchLumberMillTrees(TileIndex tile, void *user_data)
+static bool SearchLumberMillTrees(TileIndex tile, void *)
 {
 	if (IsTileType(tile, MP_TREES) && GetTreeGrowth(tile) > 2) { ///< 3 and up means all fully grown trees
 		/* found a tree */
@@ -1225,10 +1224,9 @@ void OnTick_Industry()
 
 /**
  * Check the conditions of #CHECK_NOTHING (Always succeeds).
- * @param tile %Tile to perform the checking.
  * @return Succeeded or failed command.
  */
-static CommandCost CheckNewIndustry_NULL(TileIndex tile)
+static CommandCost CheckNewIndustry_NULL(TileIndex)
 {
 	return CommandCost();
 }
diff --git a/src/industry_gui.cpp b/src/industry_gui.cpp
index 354041b37a..8526a95c8b 100644
--- a/src/industry_gui.cpp
+++ b/src/industry_gui.cpp
@@ -243,12 +243,11 @@ void SortIndustryTypes()
 
 /**
  * Command callback. In case of failure to build an industry, show an error message.
- * @param cmd    Unused.
  * @param result Result of the command.
  * @param tile   Tile where the industry is placed.
  * @param indtype Industry type.
  */
-void CcBuildIndustry(Commands cmd, const CommandCost &result, TileIndex tile, IndustryType indtype, uint32_t, bool, uint32_t)
+void CcBuildIndustry(Commands, const CommandCost &result, TileIndex tile, IndustryType indtype, uint32_t, bool, uint32_t)
 {
 	if (result.Succeeded()) return;
 
@@ -425,7 +424,7 @@ public:
 		this->SetupArrays();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_DPI_MATRIX_WIDGET: {
@@ -598,7 +597,7 @@ public:
 		}
 	}
 
-	static void AskManyRandomIndustriesCallback(Window *w, bool confirmed)
+	static void AskManyRandomIndustriesCallback(Window *, bool confirmed)
 	{
 		if (!confirmed) return;
 
@@ -613,7 +612,7 @@ public:
 		}
 	}
 
-	static void AskRemoveAllIndustriesCallback(Window *w, bool confirmed)
+	static void AskRemoveAllIndustriesCallback(Window *, bool confirmed)
 	{
 		if (!confirmed) return;
 
@@ -629,7 +628,7 @@ public:
 		MarkWholeScreenDirty();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_DPI_CREATE_RANDOM_INDUSTRIES_WIDGET: {
@@ -693,7 +692,7 @@ public:
 		this->vscroll->SetCapacityFromWidget(this, WID_DPI_MATRIX_WIDGET);
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		bool success = true;
 		/* We do not need to protect ourselves against "Random Many Industries" in this mode */
@@ -753,7 +752,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->SetupArrays();
@@ -989,12 +988,12 @@ public:
 		if (widget == WID_IV_CAPTION) SetDParam(0, this->window_number);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_IV_INFO) size->height = this->info_height;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_IV_INFO: {
@@ -1142,7 +1141,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		const Industry *i = Industry::Get(this->window_number);
@@ -1617,7 +1616,7 @@ protected:
 	}
 
 public:
-	IndustryDirectoryWindow(WindowDesc *desc, WindowNumber number) : Window(desc), industry_editbox(MAX_FILTER_LENGTH * MAX_CHAR_LENGTH, MAX_FILTER_LENGTH)
+	IndustryDirectoryWindow(WindowDesc *desc, WindowNumber) : Window(desc), industry_editbox(MAX_FILTER_LENGTH * MAX_CHAR_LENGTH, MAX_FILTER_LENGTH)
 	{
 		this->CreateNestedTree();
 		this->vscroll = this->GetScrollbar(WID_ID_SCROLLBAR);
@@ -1694,7 +1693,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_ID_DROPDOWN_ORDER: {
@@ -1732,7 +1731,7 @@ public:
 	}
 
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_ID_DROPDOWN_ORDER:
@@ -1821,7 +1820,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		switch (data) {
 			case IDIWD_FORCE_REBUILD:
@@ -2586,7 +2585,7 @@ struct IndustryCargoesWindow : public Window {
 		CargoesField::cargo_field_width = CargoesField::cargo_border.width * 2 + CargoesField::cargo_line.width * CargoesField::max_cargoes + CargoesField::cargo_space.width * (CargoesField::max_cargoes - 1);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_IC_PANEL:
@@ -2924,7 +2923,7 @@ struct IndustryCargoesWindow : public Window {
 	 * - data = NUM_INDUSTRYTYPES: Stop sending updates to the smallmap window.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (data == NUM_INDUSTRYTYPES) {
@@ -3021,7 +3020,7 @@ struct IndustryCargoesWindow : public Window {
 		return true;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_IC_PANEL: {
@@ -3108,7 +3107,7 @@ struct IndustryCargoesWindow : public Window {
 		}
 	}
 
-	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override
+	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override
 	{
 		if (widget != WID_IC_PANEL) return false;
 
diff --git a/src/intro_gui.cpp b/src/intro_gui.cpp
index 9ba6dc6b61..4f8dd95db2 100644
--- a/src/intro_gui.cpp
+++ b/src/intro_gui.cpp
@@ -190,7 +190,7 @@ struct SelectGameWindow : public Window {
 		this->mouse_idle_pos = _cursor.pos;
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		/* Move the main game viewport according to intro viewport commands. */
 
@@ -264,7 +264,7 @@ struct SelectGameWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->SetWidgetLoweredState(WID_SGI_TEMPERATE_LANDSCAPE, _settings_newgame.game_creation.landscape == LT_TEMPERATE);
@@ -297,7 +297,7 @@ struct SelectGameWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		StringID str = 0;
 		switch (widget) {
@@ -326,7 +326,7 @@ struct SelectGameWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		/* Do not create a network server when you (just) have closed one of the game
 		 * creation/load windows for the network server. */
@@ -507,7 +507,7 @@ void ShowSelectGameWindow()
 	new SelectGameWindow(&_select_game_desc);
 }
 
-static void AskExitGameCallback(Window *w, bool confirmed)
+static void AskExitGameCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		_survey.Transmit(NetworkSurveyHandler::Reason::EXIT, true);
@@ -527,7 +527,7 @@ void AskExitGame()
 }
 
 
-static void AskExitToGameMenuCallback(Window *w, bool confirmed)
+static void AskExitToGameMenuCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		_switch_mode = SM_MENU;
diff --git a/src/landscape.cpp b/src/landscape.cpp
index 036402bfd1..87c2c73943 100644
--- a/src/landscape.cpp
+++ b/src/landscape.cpp
@@ -978,10 +978,9 @@ static void CreateDesertOrRainForest(uint desert_tropic_line)
 /**
  * Find the spring of a river.
  * @param tile The tile to consider for being the spring.
- * @param user_data Ignored data.
  * @return True iff it is suitable as a spring.
  */
-static bool FindSpring(TileIndex tile, void *user_data)
+static bool FindSpring(TileIndex tile, void *)
 {
 	int referenceHeight;
 	if (!IsTileFlat(tile, &referenceHeight) || IsWaterTile(tile)) return false;
@@ -1216,13 +1215,13 @@ static int32_t River_EndNodeCheck(const AyStar *aystar, const OpenListNode *curr
 }
 
 /* AyStar callback for getting the cost of the current node. */
-static int32_t River_CalculateG(AyStar *aystar, AyStarNode *current, OpenListNode *parent)
+static int32_t River_CalculateG(AyStar *, AyStarNode *, OpenListNode *)
 {
 	return 1 + RandomRange(_settings_game.game_creation.river_route_random);
 }
 
 /* AyStar callback for getting the estimated cost to the destination. */
-static int32_t River_CalculateH(AyStar *aystar, AyStarNode *current, OpenListNode *parent)
+static int32_t River_CalculateH(AyStar *aystar, AyStarNode *current, OpenListNode *)
 {
 	return DistanceManhattan(*(TileIndex*)aystar->user_target, current->tile);
 }
@@ -1283,10 +1282,9 @@ static const uint RIVER_HASH_SIZE = 8; ///< The number of bits the hash for rive
 /**
  * Simple hash function for river tiles to be used by AyStar.
  * @param tile The tile to hash.
- * @param dir The unused direction.
  * @return The hash for the tile.
  */
-static uint River_Hash(TileIndex tile, Trackdir dir)
+static uint River_Hash(TileIndex tile, Trackdir)
 {
 	return GB(TileHash(TileX(tile), TileY(tile)), 0, RIVER_HASH_SIZE);
 }
diff --git a/src/league_gui.cpp b/src/league_gui.cpp
index f97a041604..8775695b16 100644
--- a/src/league_gui.cpp
+++ b/src/league_gui.cpp
@@ -127,7 +127,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_PLT_BACKGROUND) return;
 
@@ -175,7 +175,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == 0) {
 			/* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
@@ -354,7 +354,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_SLT_BACKGROUND) return;
 
@@ -394,7 +394,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget != WID_SLT_BACKGROUND) return;
 
@@ -411,7 +411,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		this->BuildTable();
 		this->ReInit();
diff --git a/src/linkgraph/linkgraph_gui.cpp b/src/linkgraph/linkgraph_gui.cpp
index bcd3325075..e284a156be 100644
--- a/src/linkgraph/linkgraph_gui.cpp
+++ b/src/linkgraph/linkgraph_gui.cpp
@@ -580,7 +580,7 @@ void LinkGraphLegendWindow::SetOverlay(std::shared_ptr<LinkGraphOverlay> overlay
 	}
 }
 
-void LinkGraphLegendWindow::UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
+void LinkGraphLegendWindow::UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize)
 {
 	if (IsInsideMM(widget, WID_LGL_SATURATION_FIRST, WID_LGL_SATURATION_LAST + 1)) {
 		StringID str = STR_NULL;
@@ -639,7 +639,7 @@ void LinkGraphLegendWindow::DrawWidget(const Rect &r, int widget) const
 	}
 }
 
-bool LinkGraphLegendWindow::OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond)
+bool LinkGraphLegendWindow::OnTooltip([[maybe_unused]] Point, int widget, TooltipCloseCondition close_cond)
 {
 	if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
 		if (this->IsWidgetDisabled(widget)) {
@@ -686,7 +686,7 @@ void LinkGraphLegendWindow::UpdateOverlayCargoes()
 	this->overlay->SetCargoMask(mask);
 }
 
-void LinkGraphLegendWindow::OnClick(Point pt, int widget, int click_count)
+void LinkGraphLegendWindow::OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count)
 {
 	/* Check which button is clicked */
 	if (IsInsideMM(widget, WID_LGL_COMPANY_FIRST, WID_LGL_COMPANY_LAST + 1)) {
@@ -718,7 +718,7 @@ void LinkGraphLegendWindow::OnClick(Point pt, int widget, int click_count)
  * @param data ignored
  * @param gui_scope ignored
  */
-void LinkGraphLegendWindow::OnInvalidateData(int data, bool gui_scope)
+void LinkGraphLegendWindow::OnInvalidateData([[maybe_unused]] int data, [[maybe_unused]] bool gui_scope)
 {
 	if (this->num_cargo != _sorted_cargo_specs.size()) {
 		this->Close();
diff --git a/src/linkgraph/linkgraph_gui.h b/src/linkgraph/linkgraph_gui.h
index 17b4731136..db2300e8f7 100644
--- a/src/linkgraph/linkgraph_gui.h
+++ b/src/linkgraph/linkgraph_gui.h
@@ -108,10 +108,10 @@ public:
 	LinkGraphLegendWindow(WindowDesc *desc, int window_number);
 	void SetOverlay(std::shared_ptr<LinkGraphOverlay> overlay);
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override;
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override;
 	void DrawWidget(const Rect &r, int widget) const override;
-	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override;
-	void OnClick(Point pt, int widget, int click_count) override;
+	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override;
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override;
 	void OnInvalidateData(int data = 0, bool gui_scope = true) override;
 
 private:
diff --git a/src/linkgraph/mcf.cpp b/src/linkgraph/mcf.cpp
index 051d50924e..b6160f22f4 100644
--- a/src/linkgraph/mcf.cpp
+++ b/src/linkgraph/mcf.cpp
@@ -108,10 +108,9 @@ public:
 
 	/**
 	 * Setup the node to start iterating at.
-	 * @param source Unused.
 	 * @param node Node to start iterating at.
 	 */
-	void SetNode(NodeID source, NodeID node)
+	void SetNode(NodeID, NodeID node)
 	{
 		this->i = this->job[node].edges.cbegin();
 		this->end = this->job[node].edges.cend();
@@ -197,7 +196,7 @@ public:
  * @return True if base + the new edge would be better than the path associated
  * with this annotation.
  */
-bool DistanceAnnotation::IsBetter(const DistanceAnnotation *base, uint cap,
+bool DistanceAnnotation::IsBetter(const DistanceAnnotation *base, uint,
 		int free_cap, uint dist) const
 {
 	/* If any of the paths is disconnected, the other one is better. If both
diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index d27976bbcc..36578e4672 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -78,7 +78,7 @@ bool HandlePlacePushButton(Window *w, int widget, CursorID cursor, HighLightStyl
 }
 
 
-void CcPlaySound_EXPLOSION(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcPlaySound_EXPLOSION(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_12_EXPLOSION, tile);
 }
@@ -443,7 +443,7 @@ struct MainWindow : Window
 		}
 	}
 
-	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override
+	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override
 	{
 		if (widget != WID_M_VIEWPORT) return false;
 		return this->viewport->overlay->ShowTooltip(pt, close_cond);
@@ -454,7 +454,7 @@ struct MainWindow : Window
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* Forward the message to the appropriate toolbar (ingame or scenario editor) */
diff --git a/src/misc_cmd.cpp b/src/misc_cmd.cpp
index 7b3553810a..aa2f4d6029 100644
--- a/src/misc_cmd.cpp
+++ b/src/misc_cmd.cpp
@@ -121,10 +121,9 @@ CommandCost CmdDecreaseLoan(DoCommandFlag flags, LoanCommand cmd, Money amount)
 /**
  * In case of an unsafe unpause, we want the
  * user to confirm that it might crash.
- * @param w         unused
  * @param confirmed whether the user confirmed their action
  */
-static void AskUnsafeUnpauseCallback(Window *w, bool confirmed)
+static void AskUnsafeUnpauseCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		Command<CMD_PAUSE>::Post(PM_PAUSED_ERROR, false);
@@ -191,11 +190,10 @@ CommandCost CmdPause(DoCommandFlag flags, PauseMode mode, bool pause)
 
 /**
  * Change the financial flow of your company.
- * @param flags operation to perform
  * @param amount the amount of money to receive (if positive), or spend (if negative)
  * @return the cost of this operation or an error
  */
-CommandCost CmdMoneyCheat(DoCommandFlag flags, Money amount)
+CommandCost CmdMoneyCheat(DoCommandFlag, Money amount)
 {
 	return CommandCost(EXPENSES_OTHER, -amount);
 }
diff --git a/src/misc_gui.cpp b/src/misc_gui.cpp
index 658a2ec625..13f97e1b44 100644
--- a/src/misc_gui.cpp
+++ b/src/misc_gui.cpp
@@ -88,7 +88,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_LI_BACKGROUND) return;
 
@@ -339,7 +339,7 @@ public:
 		::ShowNewGRFInspectWindow(GetGrfSpecFeature(this->tile), static_cast<uint32_t>(this->tile));
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_LI_LOCATION:
@@ -357,7 +357,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -483,7 +483,7 @@ struct AboutWindow : public Window {
 		if (widget == WID_A_COPYRIGHT) SetDParamStr(0, _openttd_revision_year);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_A_SCROLLING_TEXT) return;
 
@@ -676,7 +676,7 @@ struct TooltipsWindow : public Window
 		CLRBITS(this->flags, WF_WHITE_BORDER);
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		/* Find the free screen space between the main toolbar at the top, and the statusbar at the bottom.
 		 * Add a fixed distance 2 so the tooltip floats free from both bars.
@@ -696,7 +696,7 @@ struct TooltipsWindow : public Window
 		return pt;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		/* There is only one widget. */
 		CopyInDParam(this->params);
@@ -980,7 +980,7 @@ struct QueryStringWindow : public Window
 		this->ReInit();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_QS_DEFAULT && (this->flags & QSF_ENABLE_DEFAULT) == 0) {
 			/* We don't want this widget to show! */
@@ -1019,7 +1019,7 @@ struct QueryStringWindow : public Window
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_QS_DEFAULT:
@@ -1115,7 +1115,7 @@ struct QueryWindow : public Window {
 		this->Window::Close();
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		/* Position query window over the calling window, ensuring it's within screen bounds. */
 		this->left = SoftClamp(parent->left + (parent->width / 2) - (this->width / 2), 0, _screen.width - this->width);
@@ -1133,7 +1133,7 @@ struct QueryWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_Q_TEXT) return;
 
@@ -1151,7 +1151,7 @@ struct QueryWindow : public Window {
 				this->message, TC_FROMSTRING, SA_CENTER);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_Q_YES: {
@@ -1174,7 +1174,7 @@ struct QueryWindow : public Window {
 		}
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		/* ESC closes the window, Enter confirms the action */
 		switch (keycode) {
diff --git a/src/music/allegro_m.cpp b/src/music/allegro_m.cpp
index de2df23266..b4fd0da8b2 100644
--- a/src/music/allegro_m.cpp
+++ b/src/music/allegro_m.cpp
@@ -26,7 +26,7 @@ static MIDI *_midi = nullptr;
  */
 extern int _allegro_instance_count;
 
-const char *MusicDriver_Allegro::Start(const StringList &param)
+const char *MusicDriver_Allegro::Start(const StringList &)
 {
 	if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, nullptr)) {
 		Debug(driver, 0, "allegro: install_allegro failed '{}'", allegro_error);
diff --git a/src/music/cocoa_m.cpp b/src/music/cocoa_m.cpp
index 5fc69b1f99..bd9dfc59a1 100644
--- a/src/music/cocoa_m.cpp
+++ b/src/music/cocoa_m.cpp
@@ -79,7 +79,7 @@ static void DoSetVolume()
 /**
  * Initialized the MIDI player, including QuickTime initialization.
  */
-const char *MusicDriver_Cocoa::Start(const StringList &parm)
+const char *MusicDriver_Cocoa::Start(const StringList &)
 {
 	if (NewMusicPlayer(&_player) != noErr) return "failed to create music player";
 
diff --git a/src/music/extmidi.cpp b/src/music/extmidi.cpp
index 32fce42e2c..77b7a0c4d6 100644
--- a/src/music/extmidi.cpp
+++ b/src/music/extmidi.cpp
@@ -95,7 +95,7 @@ bool MusicDriver_ExtMidi::IsSongPlaying()
 	return this->pid != -1;
 }
 
-void MusicDriver_ExtMidi::SetVolume(byte vol)
+void MusicDriver_ExtMidi::SetVolume(byte)
 {
 	Debug(driver, 1, "extmidi: set volume not implemented");
 }
diff --git a/src/music/null_m.h b/src/music/null_m.h
index 3a034110dc..5754f55642 100644
--- a/src/music/null_m.h
+++ b/src/music/null_m.h
@@ -15,17 +15,17 @@
 /** The music player that does nothing. */
 class MusicDriver_Null : public MusicDriver {
 public:
-	const char *Start(const StringList &param) override { return nullptr; }
+	const char *Start(const StringList &) override { return nullptr; }
 
 	void Stop() override { }
 
-	void PlaySong(const MusicSongInfo &song) override { }
+	void PlaySong(const MusicSongInfo &) override { }
 
 	void StopSong() override { }
 
 	bool IsSongPlaying() override { return true; }
 
-	void SetVolume(byte vol) override { }
+	void SetVolume(byte) override { }
 	const char *GetName() const override { return "null"; }
 };
 
diff --git a/src/music/win32_m.cpp b/src/music/win32_m.cpp
index c72e8a47e3..2dd16b9c75 100644
--- a/src/music/win32_m.cpp
+++ b/src/music/win32_m.cpp
@@ -59,7 +59,7 @@ static byte ScaleVolume(byte original, byte scale)
 }
 
 
-void CALLBACK MidiOutProc(HMIDIOUT hmo, UINT wMsg, DWORD_PTR dwInstance, DWORD_PTR dwParam1, DWORD_PTR dwParam2)
+void CALLBACK MidiOutProc(HMIDIOUT hmo, UINT wMsg, DWORD_PTR, DWORD_PTR dwParam1, DWORD_PTR)
 {
 	if (wMsg == MOM_DONE) {
 		MIDIHDR *hdr = (LPMIDIHDR)dwParam1;
@@ -108,7 +108,7 @@ static void TransmitStandardSysex(MidiSysexMessage msg)
  * Realtime MIDI playback service routine.
  * This is called by the multimedia timer.
  */
-void CALLBACK TimerCallback(UINT uTimerID, UINT, DWORD_PTR dwUser, DWORD_PTR, DWORD_PTR)
+void CALLBACK TimerCallback(UINT uTimerID, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR)
 {
 	/* Ensure only one timer callback is running at once, and prevent races on status flags */
 	std::unique_lock<std::mutex> mutex_lock(_midi.lock, std::defer_lock);
diff --git a/src/music_gui.cpp b/src/music_gui.cpp
index 7ef06425ce..2a2f1e2832 100644
--- a/src/music_gui.cpp
+++ b/src/music_gui.cpp
@@ -477,7 +477,7 @@ struct MusicTrackSelectionWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		for (int i = 0; i < 6; i++) {
@@ -492,7 +492,7 @@ struct MusicTrackSelectionWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_MTS_PLAYLIST: {
@@ -560,7 +560,7 @@ struct MusicTrackSelectionWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_MTS_LIST_LEFT: { // add to playlist
@@ -674,7 +674,7 @@ struct MusicWindow : public Window {
 			);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			/* Make sure that WID_M_SHUFFLE and WID_M_PROGRAMME have the same size.
@@ -763,7 +763,7 @@ struct MusicWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		for (int i = 0; i < 6; i++) {
@@ -779,7 +779,7 @@ struct MusicWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_M_PREV: // skip to prev
diff --git a/src/network/core/address.cpp b/src/network/core/address.cpp
index fdff89544b..81a072c6e0 100644
--- a/src/network/core/address.cpp
+++ b/src/network/core/address.cpp
@@ -98,10 +98,9 @@ std::string NetworkAddress::GetAddressAsString(bool with_family)
 
 /**
  * Helper function to resolve without opening a socket.
- * @param runp information about the socket to try not
  * @return the opened socket or INVALID_SOCKET
  */
-static SOCKET ResolveLoopProc(addrinfo *runp)
+static SOCKET ResolveLoopProc(addrinfo *)
 {
 	/* We just want the first 'entry', so return a valid socket. */
 	return !INVALID_SOCKET;
diff --git a/src/network/core/http_curl.cpp b/src/network/core/http_curl.cpp
index f8f591eaed..d49f753f3e 100644
--- a/src/network/core/http_curl.cpp
+++ b/src/network/core/http_curl.cpp
@@ -174,7 +174,7 @@ void HttpThread()
 		 * up to a second before this callback is called. There is little we can
 		 * do about this. */
 		curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
-		curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, +[](void *userdata, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) -> int {
+		curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, +[](void *userdata, curl_off_t /*dltotal*/, curl_off_t /*dlnow*/, curl_off_t /*ultotal*/, curl_off_t /*ulnow*/) -> int {
 			const HTTPCallback *callback = static_cast<HTTPCallback *>(userdata);
 			return (callback->IsCancelled() || _http_thread_exit) ? 1 : 0;
 		});
diff --git a/src/network/core/http_none.cpp b/src/network/core/http_none.cpp
index 41ba7c8cba..822c71f01c 100644
--- a/src/network/core/http_none.cpp
+++ b/src/network/core/http_none.cpp
@@ -18,7 +18,7 @@
 
 #include "../../safeguards.h"
 
-/* static */ void NetworkHTTPSocketHandler::Connect(const std::string &uri, HTTPCallback *callback, const std::string data)
+/* static */ void NetworkHTTPSocketHandler::Connect(const std::string &, HTTPCallback *callback, const std::string)
 {
 	/* No valid HTTP backend was compiled in, so we fail all HTTP requests. */
 	callback->OnFailure();
diff --git a/src/network/core/http_winhttp.cpp b/src/network/core/http_winhttp.cpp
index 0d4744a808..c37711119a 100644
--- a/src/network/core/http_winhttp.cpp
+++ b/src/network/core/http_winhttp.cpp
@@ -186,7 +186,7 @@ void NetworkHTTPRequest::WinHttpCallback(DWORD code, void *info, DWORD length)
 	}
 }
 
-static void CALLBACK StaticWinHttpCallback(HINTERNET handle, DWORD_PTR context, DWORD code, void *info, DWORD length)
+static void CALLBACK StaticWinHttpCallback(HINTERNET, DWORD_PTR context, DWORD code, void *info, DWORD length)
 {
 	if (context == 0) return;
 
diff --git a/src/network/core/os_abstraction.cpp b/src/network/core/os_abstraction.cpp
index 74dbc2fe4b..8da0a3f3d0 100644
--- a/src/network/core/os_abstraction.cpp
+++ b/src/network/core/os_abstraction.cpp
@@ -129,7 +129,7 @@ bool NetworkError::HasError() const
  * @param d The socket to set the non-blocking more for.
  * @return True if setting the non-blocking mode succeeded, otherwise false.
  */
-bool SetNonBlocking(SOCKET d)
+bool SetNonBlocking([[maybe_unused]] SOCKET d)
 {
 #if defined(_WIN32)
 	u_long nonblocking = 1;
@@ -147,7 +147,7 @@ bool SetNonBlocking(SOCKET d)
  * @param d The socket to disable the delaying for.
  * @return True if disabling the delaying succeeded, otherwise false.
  */
-bool SetNoDelay(SOCKET d)
+bool SetNoDelay([[maybe_unused]] SOCKET d)
 {
 #ifdef __EMSCRIPTEN__
 	return true;
diff --git a/src/network/core/tcp.cpp b/src/network/core/tcp.cpp
index 3dc2a3fac8..626f978b42 100644
--- a/src/network/core/tcp.cpp
+++ b/src/network/core/tcp.cpp
@@ -62,7 +62,7 @@ void NetworkTCPSocketHandler::CloseSocket()
  * @param error Whether we quit under an error condition or not.
  * @return new status of the connection.
  */
-NetworkRecvStatus NetworkTCPSocketHandler::CloseConnection(bool error)
+NetworkRecvStatus NetworkTCPSocketHandler::CloseConnection([[maybe_unused]] bool error)
 {
 	this->MarkClosed();
 	this->writable = false;
diff --git a/src/network/core/tcp.h b/src/network/core/tcp.h
index 74171ed86c..da79e1fa80 100644
--- a/src/network/core/tcp.h
+++ b/src/network/core/tcp.h
@@ -121,7 +121,7 @@ public:
 	 * Callback when the connection succeeded.
 	 * @param s the socket that we opened
 	 */
-	virtual void OnConnect(SOCKET s) {}
+	virtual void OnConnect([[maybe_unused]] SOCKET s) {}
 
 	/**
 	 * Callback for when the connection attempt failed.
diff --git a/src/network/core/tcp_admin.cpp b/src/network/core/tcp_admin.cpp
index 877ee93b26..895817cad3 100644
--- a/src/network/core/tcp_admin.cpp
+++ b/src/network/core/tcp_admin.cpp
@@ -32,7 +32,7 @@ NetworkAdminSocketHandler::NetworkAdminSocketHandler(SOCKET s) : status(ADMIN_ST
 	this->sock = s;
 }
 
-NetworkRecvStatus NetworkAdminSocketHandler::CloseConnection(bool error)
+NetworkRecvStatus NetworkAdminSocketHandler::CloseConnection(bool)
 {
 	delete this;
 	return NETWORK_RECV_STATUS_CLIENT_QUIT;
@@ -129,40 +129,40 @@ NetworkRecvStatus NetworkAdminSocketHandler::ReceiveInvalidPacket(PacketAdminTyp
 	return NETWORK_RECV_STATUS_MALFORMED_PACKET;
 }
 
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_JOIN(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_JOIN); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_QUIT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_QUIT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_UPDATE_FREQUENCY(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_UPDATE_FREQUENCY); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_POLL(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_POLL); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_CHAT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_CHAT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_EXTERNAL_CHAT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_EXTERNAL_CHAT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_RCON(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_RCON); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_GAMESCRIPT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_GAMESCRIPT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_PING(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_PING); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_JOIN(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_JOIN); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_QUIT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_QUIT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_UPDATE_FREQUENCY(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_UPDATE_FREQUENCY); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_POLL(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_POLL); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_CHAT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_CHAT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_EXTERNAL_CHAT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_EXTERNAL_CHAT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_RCON(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_RCON); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_GAMESCRIPT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_GAMESCRIPT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_ADMIN_PING(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_ADMIN_PING); }
 
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_FULL(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_FULL); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_BANNED(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_BANNED); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_ERROR(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_ERROR); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_PROTOCOL(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_PROTOCOL); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_WELCOME(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_WELCOME); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_NEWGAME(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_NEWGAME); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_SHUTDOWN(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_SHUTDOWN); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_FULL(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_FULL); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_BANNED(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_BANNED); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_ERROR(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_ERROR); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_PROTOCOL(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_PROTOCOL); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_WELCOME(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_WELCOME); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_NEWGAME(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_NEWGAME); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_SHUTDOWN(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_SHUTDOWN); }
 
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_DATE(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_DATE); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_JOIN(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_JOIN); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_INFO(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_INFO); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_UPDATE); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_QUIT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_QUIT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_ERROR(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_ERROR); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_NEW(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_NEW); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_INFO(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_INFO); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_UPDATE); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_REMOVE(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_REMOVE); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_ECONOMY(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_ECONOMY); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_STATS(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_STATS); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CHAT(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CHAT); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_RCON(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_RCON); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CONSOLE(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CONSOLE); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CMD_NAMES(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CMD_NAMES); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CMD_LOGGING(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CMD_LOGGING); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_RCON_END(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_RCON_END); }
-NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_PONG(Packet *p) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_PONG); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_DATE(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_DATE); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_JOIN(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_JOIN); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_INFO(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_INFO); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_UPDATE(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_UPDATE); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_QUIT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_QUIT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CLIENT_ERROR(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CLIENT_ERROR); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_NEW(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_NEW); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_INFO(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_INFO); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_UPDATE(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_UPDATE); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_REMOVE(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_REMOVE); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_ECONOMY(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_ECONOMY); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_COMPANY_STATS(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_COMPANY_STATS); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CHAT(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CHAT); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_RCON(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_RCON); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CONSOLE(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CONSOLE); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CMD_NAMES(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CMD_NAMES); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_CMD_LOGGING(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_CMD_LOGGING); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_RCON_END(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_RCON_END); }
+NetworkRecvStatus NetworkAdminSocketHandler::Receive_SERVER_PONG(Packet *) { return this->ReceiveInvalidPacket(ADMIN_PACKET_SERVER_PONG); }
diff --git a/src/network/core/tcp_content.cpp b/src/network/core/tcp_content.cpp
index 350ae9fbb1..11df443b86 100644
--- a/src/network/core/tcp_content.cpp
+++ b/src/network/core/tcp_content.cpp
@@ -170,13 +170,13 @@ bool NetworkContentSocketHandler::ReceiveInvalidPacket(PacketContentType type)
 	return false;
 }
 
-bool NetworkContentSocketHandler::Receive_CLIENT_INFO_LIST(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_LIST); }
-bool NetworkContentSocketHandler::Receive_CLIENT_INFO_ID(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_ID); }
-bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID); }
-bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID_MD5(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID_MD5); }
-bool NetworkContentSocketHandler::Receive_SERVER_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_INFO); }
-bool NetworkContentSocketHandler::Receive_CLIENT_CONTENT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_CONTENT); }
-bool NetworkContentSocketHandler::Receive_SERVER_CONTENT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_CONTENT); }
+bool NetworkContentSocketHandler::Receive_CLIENT_INFO_LIST(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_LIST); }
+bool NetworkContentSocketHandler::Receive_CLIENT_INFO_ID(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_ID); }
+bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID); }
+bool NetworkContentSocketHandler::Receive_CLIENT_INFO_EXTID_MD5(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_INFO_EXTID_MD5); }
+bool NetworkContentSocketHandler::Receive_SERVER_INFO(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_INFO); }
+bool NetworkContentSocketHandler::Receive_CLIENT_CONTENT(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_CLIENT_CONTENT); }
+bool NetworkContentSocketHandler::Receive_SERVER_CONTENT(Packet *) { return this->ReceiveInvalidPacket(PACKET_CONTENT_SERVER_CONTENT); }
 
 /**
  * Helper to get the subdirectory a #ContentInfo is located in.
diff --git a/src/network/core/tcp_coordinator.cpp b/src/network/core/tcp_coordinator.cpp
index e10a3f9e01..cffb36ab6d 100644
--- a/src/network/core/tcp_coordinator.cpp
+++ b/src/network/core/tcp_coordinator.cpp
@@ -87,20 +87,20 @@ bool NetworkCoordinatorSocketHandler::ReceiveInvalidPacket(PacketCoordinatorType
 	return false;
 }
 
-bool NetworkCoordinatorSocketHandler::Receive_GC_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_ERROR); }
-bool NetworkCoordinatorSocketHandler::Receive_SERVER_REGISTER(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERVER_REGISTER); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_REGISTER_ACK(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_REGISTER_ACK); }
-bool NetworkCoordinatorSocketHandler::Receive_SERVER_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERVER_UPDATE); }
-bool NetworkCoordinatorSocketHandler::Receive_CLIENT_LISTING(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_LISTING); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_LISTING(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_LISTING); }
-bool NetworkCoordinatorSocketHandler::Receive_CLIENT_CONNECT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_CONNECT); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_CONNECTING(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_CONNECTING); }
-bool NetworkCoordinatorSocketHandler::Receive_SERCLI_CONNECT_FAILED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERCLI_CONNECT_FAILED); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_CONNECT_FAILED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_CONNECT_FAILED); }
-bool NetworkCoordinatorSocketHandler::Receive_CLIENT_CONNECTED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_CONNECTED); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_DIRECT_CONNECT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_DIRECT_CONNECT); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_STUN_REQUEST(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_STUN_REQUEST); }
-bool NetworkCoordinatorSocketHandler::Receive_SERCLI_STUN_RESULT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERCLI_STUN_RESULT); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_STUN_CONNECT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_STUN_CONNECT); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_NEWGRF_LOOKUP(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_NEWGRF_LOOKUP); }
-bool NetworkCoordinatorSocketHandler::Receive_GC_TURN_CONNECT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_TURN_CONNECT); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_ERROR(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_ERROR); }
+bool NetworkCoordinatorSocketHandler::Receive_SERVER_REGISTER(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERVER_REGISTER); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_REGISTER_ACK(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_REGISTER_ACK); }
+bool NetworkCoordinatorSocketHandler::Receive_SERVER_UPDATE(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERVER_UPDATE); }
+bool NetworkCoordinatorSocketHandler::Receive_CLIENT_LISTING(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_LISTING); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_LISTING(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_LISTING); }
+bool NetworkCoordinatorSocketHandler::Receive_CLIENT_CONNECT(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_CONNECT); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_CONNECTING(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_CONNECTING); }
+bool NetworkCoordinatorSocketHandler::Receive_SERCLI_CONNECT_FAILED(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERCLI_CONNECT_FAILED); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_CONNECT_FAILED(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_CONNECT_FAILED); }
+bool NetworkCoordinatorSocketHandler::Receive_CLIENT_CONNECTED(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_CLIENT_CONNECTED); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_DIRECT_CONNECT(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_DIRECT_CONNECT); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_STUN_REQUEST(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_STUN_REQUEST); }
+bool NetworkCoordinatorSocketHandler::Receive_SERCLI_STUN_RESULT(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_SERCLI_STUN_RESULT); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_STUN_CONNECT(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_STUN_CONNECT); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_NEWGRF_LOOKUP(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_NEWGRF_LOOKUP); }
+bool NetworkCoordinatorSocketHandler::Receive_GC_TURN_CONNECT(Packet *) { return this->ReceiveInvalidPacket(PACKET_COORDINATOR_GC_TURN_CONNECT); }
diff --git a/src/network/core/tcp_game.cpp b/src/network/core/tcp_game.cpp
index 8960909e98..0f8051eef6 100644
--- a/src/network/core/tcp_game.cpp
+++ b/src/network/core/tcp_game.cpp
@@ -40,7 +40,7 @@ NetworkGameSocketHandler::NetworkGameSocketHandler(SOCKET s) : info(nullptr), cl
  * For servers: close connection and that is it
  * @return the new status
  */
-NetworkRecvStatus NetworkGameSocketHandler::CloseConnection(bool error)
+NetworkRecvStatus NetworkGameSocketHandler::CloseConnection(bool)
 {
 	/* Clients drop back to the main menu */
 	if (!_network_server && _networking) {
@@ -156,50 +156,50 @@ NetworkRecvStatus NetworkGameSocketHandler::ReceiveInvalidPacket(PacketGameType
 	return NETWORK_RECV_STATUS_MALFORMED_PACKET;
 }
 
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_FULL); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_BANNED); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_JOIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_JOIN); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_INFO); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_GAME_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_GAME_INFO); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CLIENT_INFO(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CLIENT_INFO); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_GAME_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_GAME_PASSWORD); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_COMPANY_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_COMPANY_PASSWORD); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_PASSWORD); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMPANY_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMPANY_PASSWORD); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WELCOME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_WELCOME); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GETMAP); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WAIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_WAIT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_BEGIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_BEGIN); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_SIZE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_SIZE); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DATA(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DATA); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DONE); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MAP_OK(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MAP_OK); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_JOIN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_JOIN); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FRAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_FRAME); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SYNC(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_SYNC); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ACK(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ACK); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMMAND(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMMAND); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMMAND(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMMAND); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_CHAT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_CHAT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHAT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHAT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_EXTERNAL_CHAT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_EXTERNAL_CHAT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_PASSWORD(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_PASSWORD); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_NAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_NAME); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_QUIT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ERROR); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_QUIT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR_QUIT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR_QUIT); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_SHUTDOWN); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEWGAME(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEWGAME); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_RCON(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_RCON); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_RCON(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_RCON); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHECK_NEWGRFS(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHECK_NEWGRFS); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_NEWGRFS_CHECKED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_NEWGRFS_CHECKED); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MOVE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_MOVE); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MOVE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MOVE); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMPANY_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMPANY_UPDATE); }
-NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CONFIG_UPDATE(Packet *p) { return this->ReceiveInvalidPacket(PACKET_SERVER_CONFIG_UPDATE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FULL(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_FULL); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_BANNED); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_JOIN(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_JOIN); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_INFO(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_INFO); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_GAME_INFO(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_GAME_INFO); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CLIENT_INFO(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_CLIENT_INFO); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_GAME_PASSWORD(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_GAME_PASSWORD); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEED_COMPANY_PASSWORD(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEED_COMPANY_PASSWORD); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GAME_PASSWORD(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GAME_PASSWORD); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMPANY_PASSWORD(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMPANY_PASSWORD); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WELCOME(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_WELCOME); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_GETMAP); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_WAIT(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_WAIT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_BEGIN(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_BEGIN); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_SIZE(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_SIZE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DATA(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DATA); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_MAP_DONE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MAP_OK(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MAP_OK); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_JOIN(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_JOIN); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_FRAME(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_FRAME); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SYNC(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_SYNC); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ACK(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ACK); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_COMMAND(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_COMMAND); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMMAND(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMMAND); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_CHAT(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_CHAT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHAT(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHAT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_EXTERNAL_CHAT(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_EXTERNAL_CHAT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_PASSWORD(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_PASSWORD); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_SET_NAME(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_SET_NAME); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_QUIT(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_QUIT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_ERROR(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_ERROR); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_QUIT(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_QUIT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_ERROR_QUIT(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_ERROR_QUIT); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_SHUTDOWN); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_NEWGAME(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_NEWGAME); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_RCON(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_RCON); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_RCON(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_RCON); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CHECK_NEWGRFS(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_CHECK_NEWGRFS); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_NEWGRFS_CHECKED(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_NEWGRFS_CHECKED); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_MOVE(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_MOVE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_CLIENT_MOVE(Packet *) { return this->ReceiveInvalidPacket(PACKET_CLIENT_MOVE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_COMPANY_UPDATE(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_COMPANY_UPDATE); }
+NetworkRecvStatus NetworkGameSocketHandler::Receive_SERVER_CONFIG_UPDATE(Packet *) { return this->ReceiveInvalidPacket(PACKET_SERVER_CONFIG_UPDATE); }
 
 void NetworkGameSocketHandler::DeferDeletion()
 {
diff --git a/src/network/core/tcp_stun.cpp b/src/network/core/tcp_stun.cpp
index b6aeff6836..1445fe30e5 100644
--- a/src/network/core/tcp_stun.cpp
+++ b/src/network/core/tcp_stun.cpp
@@ -26,4 +26,4 @@ bool NetworkStunSocketHandler::ReceiveInvalidPacket(PacketStunType type)
 	return false;
 }
 
-bool NetworkStunSocketHandler::Receive_SERCLI_STUN(Packet *p) { return this->ReceiveInvalidPacket(PACKET_STUN_SERCLI_STUN); }
+bool NetworkStunSocketHandler::Receive_SERCLI_STUN(Packet *) { return this->ReceiveInvalidPacket(PACKET_STUN_SERCLI_STUN); }
diff --git a/src/network/core/tcp_turn.cpp b/src/network/core/tcp_turn.cpp
index c3c3ff8d83..76096aeb2b 100644
--- a/src/network/core/tcp_turn.cpp
+++ b/src/network/core/tcp_turn.cpp
@@ -66,6 +66,6 @@ bool NetworkTurnSocketHandler::ReceiveInvalidPacket(PacketTurnType type)
 	return false;
 }
 
-bool NetworkTurnSocketHandler::Receive_TURN_ERROR(Packet *p) { return this->ReceiveInvalidPacket(PACKET_TURN_TURN_ERROR); }
-bool NetworkTurnSocketHandler::Receive_SERCLI_CONNECT(Packet *p) { return this->ReceiveInvalidPacket(PACKET_TURN_SERCLI_CONNECT); }
-bool NetworkTurnSocketHandler::Receive_TURN_CONNECTED(Packet *p) { return this->ReceiveInvalidPacket(PACKET_TURN_TURN_CONNECTED); }
+bool NetworkTurnSocketHandler::Receive_TURN_ERROR(Packet *) { return this->ReceiveInvalidPacket(PACKET_TURN_TURN_ERROR); }
+bool NetworkTurnSocketHandler::Receive_SERCLI_CONNECT(Packet *) { return this->ReceiveInvalidPacket(PACKET_TURN_SERCLI_CONNECT); }
+bool NetworkTurnSocketHandler::Receive_TURN_CONNECTED(Packet *) { return this->ReceiveInvalidPacket(PACKET_TURN_TURN_CONNECTED); }
diff --git a/src/network/core/udp.cpp b/src/network/core/udp.cpp
index 4c226f0115..da7ac1221b 100644
--- a/src/network/core/udp.cpp
+++ b/src/network/core/udp.cpp
@@ -183,5 +183,5 @@ void NetworkUDPSocketHandler::ReceiveInvalidPacket(PacketUDPType type, NetworkAd
 	Debug(net, 0, "[udp] Received packet type {} on wrong port from {}", type, client_addr->GetAddressAsString());
 }
 
-void NetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_FIND_SERVER, client_addr); }
-void NetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_RESPONSE, client_addr); }
+void NetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_CLIENT_FIND_SERVER, client_addr); }
+void NetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *, NetworkAddress *client_addr) { this->ReceiveInvalidPacket(PACKET_UDP_SERVER_RESPONSE, client_addr); }
diff --git a/src/network/network_admin.cpp b/src/network/network_admin.cpp
index 8a33b97c54..3e633f9b34 100644
--- a/src/network/network_admin.cpp
+++ b/src/network/network_admin.cpp
@@ -654,7 +654,7 @@ NetworkRecvStatus ServerNetworkAdminSocketHandler::Receive_ADMIN_JOIN(Packet *p)
 	return this->SendProtocol();
 }
 
-NetworkRecvStatus ServerNetworkAdminSocketHandler::Receive_ADMIN_QUIT(Packet *p)
+NetworkRecvStatus ServerNetworkAdminSocketHandler::Receive_ADMIN_QUIT(Packet *)
 {
 	/* The admin is leaving nothing else to do */
 	return this->CloseConnection();
diff --git a/src/network/network_chat_gui.cpp b/src/network/network_chat_gui.cpp
index c43b44172a..1ce4f58ba4 100644
--- a/src/network/network_chat_gui.cpp
+++ b/src/network/network_chat_gui.cpp
@@ -308,7 +308,7 @@ struct NetworkChatWindow : public Window {
 		this->Window::Close();
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		Window::FindWindowPlacementAndResize(_toolbar_width, def_height);
 	}
@@ -436,7 +436,7 @@ struct NetworkChatWindow : public Window {
 		}
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = { 0, _screen.height - sm_height - FindWindowById(WC_STATUS_BAR, 0)->height };
 		return pt;
@@ -451,7 +451,7 @@ struct NetworkChatWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NC_SENDBUTTON: /* Send */
@@ -464,7 +464,7 @@ struct NetworkChatWindow : public Window {
 		}
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		EventState state = ES_NOT_HANDLED;
 		if (keycode == WKC_TAB) {
@@ -484,7 +484,7 @@ struct NetworkChatWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == this->dest) this->Close();
 	}
diff --git a/src/network/network_client.cpp b/src/network/network_client.cpp
index 1407217237..85a20ed30d 100644
--- a/src/network/network_client.cpp
+++ b/src/network/network_client.cpp
@@ -534,7 +534,7 @@ bool ClientNetworkGameSocketHandler::IsConnected()
 
 extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, struct LoadFilter *lf = nullptr);
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *)
 {
 	/* We try to join a server which is full */
 	ShowErrorMessage(STR_NETWORK_ERROR_SERVER_FULL, INVALID_STRING_ID, WL_CRITICAL);
@@ -542,7 +542,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
 	return NETWORK_RECV_STATUS_SERVER_FULL;
 }
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *)
 {
 	/* We try to join a server where we are banned */
 	ShowErrorMessage(STR_NETWORK_ERROR_SERVER_BANNED, INVALID_STRING_ID, WL_CRITICAL);
@@ -685,7 +685,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_CHECK_NEWGRFS(P
 	return ret;
 }
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_NEED_GAME_PASSWORD(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_NEED_GAME_PASSWORD(Packet *)
 {
 	if (this->status < STATUS_JOIN || this->status >= STATUS_AUTH_GAME) return NETWORK_RECV_STATUS_MALFORMED_PACKET;
 	this->status = STATUS_AUTH_GAME;
@@ -790,7 +790,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_MAP_DATA(Packet
 	return NETWORK_RECV_STATUS_OKAY;
 }
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet *)
 {
 	if (this->status != STATUS_MAP) return NETWORK_RECV_STATUS_MALFORMED_PACKET;
 	if (this->savegame == nullptr) return NETWORK_RECV_STATUS_MALFORMED_PACKET;
@@ -1035,7 +1035,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_JOIN(Packet *p)
 	return NETWORK_RECV_STATUS_OKAY;
 }
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet *)
 {
 	/* Only when we're trying to join we really
 	 * care about the server shutting down. */
@@ -1048,7 +1048,7 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_SHUTDOWN(Packet
 	return NETWORK_RECV_STATUS_SERVER_ERROR;
 }
 
-NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_NEWGAME(Packet *p)
+NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_NEWGAME(Packet *)
 {
 	/* Only when we're trying to join we really
 	 * care about the server shutting down. */
diff --git a/src/network/network_content.cpp b/src/network/network_content.cpp
index cb0561369b..d54a61a1d2 100644
--- a/src/network/network_content.cpp
+++ b/src/network/network_content.cpp
@@ -792,7 +792,7 @@ void ClientNetworkContentSocketHandler::Connect()
 /**
  * Disconnect from the content server.
  */
-NetworkRecvStatus ClientNetworkContentSocketHandler::CloseConnection(bool error)
+NetworkRecvStatus ClientNetworkContentSocketHandler::CloseConnection(bool)
 {
 	this->isCancelled = true;
 	NetworkContentSocketHandler::CloseConnection();
diff --git a/src/network/network_content.h b/src/network/network_content.h
index d329dd90f0..ecf300729e 100644
--- a/src/network/network_content.h
+++ b/src/network/network_content.h
@@ -31,7 +31,7 @@ struct ContentCallback {
 	 * Callback for when the connection has finished
 	 * @param success whether the connection was made or that we failed to make it
 	 */
-	virtual void OnConnect(bool success) {}
+	virtual void OnConnect([[maybe_unused]] bool success) {}
 
 	/**
 	 * Callback for when the connection got disconnected.
@@ -42,20 +42,20 @@ struct ContentCallback {
 	 * We received a content info.
 	 * @param ci the content info
 	 */
-	virtual void OnReceiveContentInfo(const ContentInfo *ci) {}
+	virtual void OnReceiveContentInfo([[maybe_unused]] const ContentInfo *ci) {}
 
 	/**
 	 * We have progress in the download of a file
 	 * @param ci the content info of the file
 	 * @param bytes the number of bytes downloaded since the previous call
 	 */
-	virtual void OnDownloadProgress(const ContentInfo *ci, int bytes) {}
+	virtual void OnDownloadProgress([[maybe_unused]] const ContentInfo *ci, [[maybe_unused]] int bytes) {}
 
 	/**
 	 * We have finished downloading a file
 	 * @param cid the ContentID of the downloaded file
 	 */
-	virtual void OnDownloadComplete(ContentID cid) {}
+	virtual void OnDownloadComplete([[maybe_unused]] ContentID cid) {}
 
 	/** Silentium */
 	virtual ~ContentCallback() = default;
diff --git a/src/network/network_content_gui.cpp b/src/network/network_content_gui.cpp
index 2572b8a7b2..fb1f435473 100644
--- a/src/network/network_content_gui.cpp
+++ b/src/network/network_content_gui.cpp
@@ -114,7 +114,7 @@ void BaseNetworkContentDownloadStatusWindow::Close()
 	this->Window::Close();
 }
 
-void BaseNetworkContentDownloadStatusWindow::UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
+void BaseNetworkContentDownloadStatusWindow::UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize)
 {
 	switch (widget) {
 		case WID_NCDS_PROGRESS_BAR:
@@ -285,7 +285,7 @@ public:
 		this->BaseNetworkContentDownloadStatusWindow::Close();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget == WID_NCDS_CANCELOK) {
 			if (this->downloaded_bytes != this->total_bytes) {
@@ -581,7 +581,7 @@ public:
 		this->checkbox_size = maxdim(maxdim(GetSpriteSize(SPR_BOX_EMPTY), GetSpriteSize(SPR_BOX_CHECKED)), GetSpriteSize(SPR_BLOT));
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NCL_CHECKBOX:
@@ -788,7 +788,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_NCL_TEXTFILE && widget < WID_NCL_TEXTFILE + TFT_CONTENT_END) {
 			if (this->selected == nullptr || this->selected->state != ContentInfo::ALREADY_HERE) return;
@@ -873,7 +873,7 @@ public:
 		}
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		if (this->vscroll->UpdateListPositionOnKeyPress(this->list_pos, keycode) == ES_NOT_HANDLED) {
 			switch (keycode) {
@@ -943,7 +943,7 @@ public:
 		this->InvalidateData(0, false);
 	}
 
-	void OnDownloadComplete(ContentID cid) override
+	void OnDownloadComplete(ContentID) override
 	{
 		this->content.ForceResort();
 		this->InvalidateData();
@@ -965,7 +965,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (this->content.NeedRebuild()) this->BuildContentList();
diff --git a/src/network/network_content_gui.h b/src/network/network_content_gui.h
index adf074e794..300095fe7e 100644
--- a/src/network/network_content_gui.h
+++ b/src/network/network_content_gui.h
@@ -33,7 +33,7 @@ public:
 	BaseNetworkContentDownloadStatusWindow(WindowDesc *desc);
 
 	void Close() override;
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override;
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override;
 	void DrawWidget(const Rect &r, int widget) const override;
 	void OnDownloadProgress(const ContentInfo *ci, int bytes) override;
 };
diff --git a/src/network/network_gui.cpp b/src/network/network_gui.cpp
index 2215a0cd6b..c8108a10f4 100644
--- a/src/network/network_gui.cpp
+++ b/src/network/network_gui.cpp
@@ -515,7 +515,7 @@ public:
 		this->flag_offset = this->blot_offset + ScaleGUITrad(2) + GetSpriteSize(SPR_BLOT).width;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NG_MATRIX:
@@ -720,7 +720,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NG_CANCEL: // Cancel button
@@ -818,13 +818,13 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		this->servers.ForceRebuild();
 		this->SetDirty();
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		EventState state = ES_NOT_HANDLED;
 
@@ -888,7 +888,7 @@ public:
 	}
 
 	/** Refresh the online servers on a regular interval. */
-	IntervalTimer<TimerWindow> refresh_interval = {std::chrono::seconds(30), [this](uint count) {
+	IntervalTimer<TimerWindow> refresh_interval = {std::chrono::seconds(30), [this](uint) {
 		if (!this->searched_internet) return;
 
 		_network_coordinator_client.GetListing();
@@ -1058,7 +1058,7 @@ struct NetworkStartServerWindow : public Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NSS_CONNTYPE_BTN:
@@ -1078,7 +1078,7 @@ struct NetworkStartServerWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NSS_CANCEL: // Cancel button
@@ -1369,30 +1369,27 @@ enum DropDownAdmin {
 
 /**
  * Callback function for admin command to kick client.
- * @param w The window which initiated the confirmation dialog.
  * @param confirmed Iff the user pressed Yes.
  */
-static void AdminClientKickCallback(Window *w, bool confirmed)
+static void AdminClientKickCallback(Window *, bool confirmed)
 {
 	if (confirmed) NetworkServerKickClient(_admin_client_id, {});
 }
 
 /**
  * Callback function for admin command to ban client.
- * @param w The window which initiated the confirmation dialog.
  * @param confirmed Iff the user pressed Yes.
  */
-static void AdminClientBanCallback(Window *w, bool confirmed)
+static void AdminClientBanCallback(Window *, bool confirmed)
 {
 	if (confirmed) NetworkServerKickOrBanIP(_admin_client_id, true, {});
 }
 
 /**
  * Callback function for admin command to reset company.
- * @param w The window which initiated the confirmation dialog.
  * @param confirmed Iff the user pressed Yes.
  */
-static void AdminCompanyResetCallback(Window *w, bool confirmed)
+static void AdminCompanyResetCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		if (NetworkCompanyHasClients(_admin_company_id)) return;
@@ -1402,10 +1399,9 @@ static void AdminCompanyResetCallback(Window *w, bool confirmed)
 
 /**
  * Callback function for admin command to unlock company.
- * @param w The window which initiated the confirmation dialog.
  * @param confirmed Iff the user pressed Yes.
  */
-static void AdminCompanyUnlockCallback(Window *w, bool confirmed)
+static void AdminCompanyUnlockCallback(Window *, bool confirmed)
 {
 	if (confirmed) NetworkServerSetCompanyPassword(_admin_company_id, "", false);
 }
@@ -1500,7 +1496,7 @@ private:
 	 * @param pt The point where this button was clicked.
 	 * @param company_id The company this button was assigned to.
 	 */
-	static void OnClickCompanyChat(NetworkClientListWindow *w, Point pt, CompanyID company_id)
+	static void OnClickCompanyChat([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, CompanyID company_id)
 	{
 		ShowNetworkChatQueryWindow(DESTTYPE_TEAM, company_id);
 	}
@@ -1511,7 +1507,7 @@ private:
 	 * @param pt The point where this button was clicked.
 	 * @param company_id The company this button was assigned to.
 	 */
-	static void OnClickCompanyJoin(NetworkClientListWindow *w, Point pt, CompanyID company_id)
+	static void OnClickCompanyJoin([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, CompanyID company_id)
 	{
 		if (_network_server) {
 			NetworkServerDoMove(CLIENT_ID_SERVER, company_id);
@@ -1529,9 +1525,8 @@ private:
 	 * Crete new company button is clicked.
 	 * @param w The instance of this window.
 	 * @param pt The point where this button was clicked.
-	 * @param company_id The company this button was assigned to.
 	 */
-	static void OnClickCompanyNew(NetworkClientListWindow *w, Point pt, CompanyID company_id)
+	static void OnClickCompanyNew([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, CompanyID)
 	{
 		if (_network_server) {
 			Command<CMD_COMPANY_CTRL>::Post(CCA_NEW, INVALID_COMPANY, CRR_NONE, _network_own_client_id);
@@ -1546,7 +1541,7 @@ private:
 	 * @param pt The point where this button was clicked.
 	 * @param client_id The client this button was assigned to.
 	 */
-	static void OnClickClientAdmin(NetworkClientListWindow *w, Point pt, ClientID client_id)
+	static void OnClickClientAdmin([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, ClientID client_id)
 	{
 		DropDownList list;
 		list.emplace_back(new DropDownListStringItem(STR_NETWORK_CLIENT_LIST_ADMIN_CLIENT_KICK, DD_CLIENT_ADMIN_KICK, false));
@@ -1568,7 +1563,7 @@ private:
 	 * @param pt The point where this button was clicked.
 	 * @param company_id The company this button was assigned to.
 	 */
-	static void OnClickCompanyAdmin(NetworkClientListWindow *w, Point pt, CompanyID company_id)
+	static void OnClickCompanyAdmin([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, CompanyID company_id)
 	{
 		DropDownList list;
 		list.emplace_back(new DropDownListStringItem(STR_NETWORK_CLIENT_LIST_ADMIN_COMPANY_RESET, DD_COMPANY_ADMIN_RESET, NetworkCompanyHasClients(company_id)));
@@ -1589,7 +1584,7 @@ private:
 	 * @param pt The point where this button was clicked.
 	 * @param client_id The client this button was assigned to.
 	 */
-	static void OnClickClientChat(NetworkClientListWindow *w, Point pt, ClientID client_id)
+	static void OnClickClientChat([[maybe_unused]] NetworkClientListWindow *w, [[maybe_unused]] Point pt, ClientID client_id)
 	{
 		ShowNetworkChatQueryWindow(DESTTYPE_CLIENT, client_id);
 	}
@@ -1717,7 +1712,7 @@ public:
 		RebuildList();
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		this->RebuildList();
 
@@ -1726,7 +1721,7 @@ public:
 		this->SetWidgetDisabledState(WID_CL_SERVER_NAME_EDIT, !_network_server);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_CL_SERVER_VISIBILITY:
@@ -1789,7 +1784,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_CL_SERVER_NAME_EDIT:
@@ -1823,7 +1818,7 @@ public:
 		}
 	}
 
-	bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) override
+	bool OnTooltip([[maybe_unused]] Point pt, int widget, TooltipCloseCondition close_cond) override
 	{
 		switch (widget) {
 			case WID_CL_MATRIX: {
@@ -2116,7 +2111,7 @@ public:
 		}
 	}
 
-	void OnMouseOver(Point pt, int widget) override
+	void OnMouseOver([[maybe_unused]] Point pt, int widget) override
 	{
 		if (widget != WID_CL_MATRIX) {
 			if (this->hover_index != -1) {
@@ -2203,7 +2198,7 @@ struct NetworkJoinStatusWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NJS_PROGRESS_BAR:
@@ -2229,7 +2224,7 @@ struct NetworkJoinStatusWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget == WID_NJS_CANCELOK) { // Disconnect button
 			NetworkDisconnect();
@@ -2318,7 +2313,7 @@ struct NetworkCompanyPasswordWindow : public Window {
 		this->ReInit();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_NCP_WARNING) {
 			*size = this->warning_size;
@@ -2342,7 +2337,7 @@ struct NetworkCompanyPasswordWindow : public Window {
 		NetworkChangeCompanyPassword(_local_company, this->password_editbox.text.buf);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NCP_OK:
@@ -2418,7 +2413,7 @@ struct NetworkAskRelayWindow : public Window {
 		this->InitNested(0);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_NAR_TEXT) {
 			*size = GetStringBoundingBox(STR_NETWORK_ASK_RELAY_TEXT);
@@ -2434,7 +2429,7 @@ struct NetworkAskRelayWindow : public Window {
 		}
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		/* Position query window over the calling window, ensuring it's within screen bounds. */
 		this->left = Clamp(parent->left + (parent->width / 2) - (this->width / 2), 0, _screen.width - this->width);
@@ -2452,7 +2447,7 @@ struct NetworkAskRelayWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NAR_NO:
@@ -2521,7 +2516,7 @@ struct NetworkAskSurveyWindow : public Window {
 		this->InitNested(0);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_NAS_TEXT) {
 			*size = GetStringBoundingBox(STR_NETWORK_ASK_SURVEY_TEXT);
@@ -2537,7 +2532,7 @@ struct NetworkAskSurveyWindow : public Window {
 		}
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		/* Position query window over the calling window, ensuring it's within screen bounds. */
 		this->left = Clamp(parent->left + (parent->width / 2) - (this->width / 2), 0, _screen.width - this->width);
@@ -2545,7 +2540,7 @@ struct NetworkAskSurveyWindow : public Window {
 		this->SetDirty();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NAS_PREVIEW:
diff --git a/src/network/network_query.cpp b/src/network/network_query.cpp
index 441c22e816..f6671b066e 100644
--- a/src/network/network_query.cpp
+++ b/src/network/network_query.cpp
@@ -75,7 +75,7 @@ NetworkRecvStatus QueryNetworkGameSocketHandler::SendGameInfo()
 	return NETWORK_RECV_STATUS_OKAY;
 }
 
-NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
+NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *)
 {
 	NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
 	item->status = NGLS_FULL;
@@ -86,7 +86,7 @@ NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
 	return NETWORK_RECV_STATUS_CLOSE_QUERY;
 }
 
-NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *p)
+NetworkRecvStatus QueryNetworkGameSocketHandler::Receive_SERVER_BANNED(Packet *)
 {
 	NetworkGameList *item = NetworkGameListAddItem(this->connection_string);
 	item->status = NGLS_BANNED;
diff --git a/src/network/network_server.cpp b/src/network/network_server.cpp
index d702321013..8a4960425e 100644
--- a/src/network/network_server.cpp
+++ b/src/network/network_server.cpp
@@ -799,12 +799,12 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::SendConfigUpdate()
  *   DEF_SERVER_RECEIVE_COMMAND has parameter: NetworkClientSocket *cs, Packet *p
  ************/
 
-NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_GAME_INFO(Packet *p)
+NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_GAME_INFO(Packet *)
 {
 	return this->SendGameInfo();
 }
 
-NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_NEWGRFS_CHECKED(Packet *p)
+NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_NEWGRFS_CHECKED(Packet *)
 {
 	if (this->status != STATUS_NEWGRFS_CHECK) {
 		/* Illegal call, return error and ignore the packet */
@@ -945,7 +945,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_COMPANY_PASSWOR
 	return this->SendWelcome();
 }
 
-NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *p)
+NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *)
 {
 	/* The client was never joined.. so this is impossible, right?
 	 *  Ignore the packet, give the client a warning, and close the connection */
@@ -966,7 +966,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_GETMAP(Packet *
 	return this->SendMap();
 }
 
-NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_MAP_OK(Packet *p)
+NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_MAP_OK(Packet *)
 {
 	/* Client has the map, now start syncing */
 	if (this->status == STATUS_DONE_MAP && !this->HasClientQuit()) {
@@ -1107,7 +1107,7 @@ NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_ERROR(Packet *p
 	return this->CloseConnection(NETWORK_RECV_STATUS_CLIENT_QUIT);
 }
 
-NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_QUIT(Packet *p)
+NetworkRecvStatus ServerNetworkGameSocketHandler::Receive_CLIENT_QUIT(Packet *)
 {
 	/* The client was never joined.. thank the client for the packet, but ignore it */
 	if (this->status < STATUS_DONE_MAP || this->HasClientQuit()) {
diff --git a/src/network/network_survey.cpp b/src/network/network_survey.cpp
index 96f9c964a1..aa8cead44e 100644
--- a/src/network/network_survey.cpp
+++ b/src/network/network_survey.cpp
@@ -110,7 +110,7 @@ void NetworkSurveyHandler::OnFailure()
 	this->loaded.notify_all();
 }
 
-void NetworkSurveyHandler::OnReceiveData(const char *data, size_t length)
+void NetworkSurveyHandler::OnReceiveData(const char *data, size_t)
 {
 	if (data == nullptr) {
 		Debug(net, 1, "Survey: survey results sent");
diff --git a/src/network/network_turn.cpp b/src/network/network_turn.cpp
index f47f8b9326..e6f48d535a 100644
--- a/src/network/network_turn.cpp
+++ b/src/network/network_turn.cpp
@@ -45,7 +45,7 @@ public:
 	}
 };
 
-bool ClientNetworkTurnSocketHandler::Receive_TURN_ERROR(Packet *p)
+bool ClientNetworkTurnSocketHandler::Receive_TURN_ERROR(Packet *)
 {
 	this->ConnectFailure();
 
diff --git a/src/network/network_udp.cpp b/src/network/network_udp.cpp
index 7e7509fd70..4d5ff526ea 100644
--- a/src/network/network_udp.cpp
+++ b/src/network/network_udp.cpp
@@ -73,7 +73,7 @@ public:
 	virtual ~ServerNetworkUDPSocketHandler() = default;
 };
 
-void ServerNetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *p, NetworkAddress *client_addr)
+void ServerNetworkUDPSocketHandler::Receive_CLIENT_FIND_SERVER(Packet *, NetworkAddress *client_addr)
 {
 	Packet packet(PACKET_UDP_SERVER_RESPONSE);
 	this->SendPacket(&packet, client_addr);
@@ -91,7 +91,7 @@ public:
 	virtual ~ClientNetworkUDPSocketHandler() = default;
 };
 
-void ClientNetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *p, NetworkAddress *client_addr)
+void ClientNetworkUDPSocketHandler::Receive_SERVER_RESPONSE(Packet *, NetworkAddress *client_addr)
 {
 	Debug(net, 3, "Server response from {}", client_addr->GetAddressAsString());
 
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 787b0cc386..a89addfcc4 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -8552,10 +8552,9 @@ static void StaticGRFInfo(ByteReader *buf)
 
 /**
  * Set the current NewGRF as unsafe for static use
- * @param buf Unused.
  * @note Used during safety scan on unsafe actions.
  */
-static void GRFUnsafe(ByteReader *buf)
+static void GRFUnsafe(ByteReader *)
 {
 	SetBit(_cur.grfconfig->flags, GCF_UNSAFE);
 
diff --git a/src/newgrf_airport.cpp b/src/newgrf_airport.cpp
index fe7566a7d4..41e8c7021a 100644
--- a/src/newgrf_airport.cpp
+++ b/src/newgrf_airport.cpp
@@ -33,7 +33,7 @@ template <typename Tspec, typename Tid, Tid Tmax>
 }
 
 template <typename Tspec, typename Tid, Tid Tmax>
-bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint index) const
+bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint) const
 {
 	return true;
 }
@@ -153,7 +153,7 @@ void AirportOverrideManager::SetEntitySpec(AirportSpec *as)
 	}
 }
 
-/* virtual */ uint32_t AirportScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t AirportScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	switch (variable) {
 		case 0x40: return this->layout;
diff --git a/src/newgrf_airport.h b/src/newgrf_airport.h
index 273b0d60c8..eafcef04ac 100644
--- a/src/newgrf_airport.h
+++ b/src/newgrf_airport.h
@@ -166,7 +166,7 @@ struct AirportScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 	void StorePSA(uint pos, int32_t value) override;
 };
 
diff --git a/src/newgrf_airporttiles.cpp b/src/newgrf_airporttiles.cpp
index 1abf8b20bc..f9fa2f86d4 100644
--- a/src/newgrf_airporttiles.cpp
+++ b/src/newgrf_airporttiles.cpp
@@ -159,7 +159,7 @@ static uint32_t GetAirportTileIDAtOffset(TileIndex tile, const Station *st, uint
 	return 0xFF << 8 | ats->grf_prop.subst_id; // so just give it the substitute
 }
 
-/* virtual */ uint32_t AirportTileScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t AirportTileScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	assert(this->st != nullptr);
 
@@ -231,7 +231,7 @@ uint32_t AirportTileResolverObject::GetDebugID() const
 	return this->tiles_scope.ats->grf_prop.local_id;
 }
 
-uint16_t GetAirportTileCallback(CallbackID callback, uint32_t param1, uint32_t param2, const AirportTileSpec *ats, Station *st, TileIndex tile, int extra_data = 0)
+uint16_t GetAirportTileCallback(CallbackID callback, uint32_t param1, uint32_t param2, const AirportTileSpec *ats, Station *st, TileIndex tile, [[maybe_unused]] int extra_data = 0)
 {
 	AirportTileResolverObject object(ats, tile, st, callback, param1, param2);
 	return object.ResolveCallback();
diff --git a/src/newgrf_airporttiles.h b/src/newgrf_airporttiles.h
index c855d64c15..de1a984e2a 100644
--- a/src/newgrf_airporttiles.h
+++ b/src/newgrf_airporttiles.h
@@ -38,7 +38,7 @@ struct AirportTileScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Resolver for tiles of an airport. */
diff --git a/src/newgrf_animation_base.h b/src/newgrf_animation_base.h
index e7ef4297e7..7ab4968194 100644
--- a/src/newgrf_animation_base.h
+++ b/src/newgrf_animation_base.h
@@ -19,8 +19,8 @@
 
 template <typename Tobj>
 struct TileAnimationFrameAnimationHelper {
-	static byte Get(Tobj *obj, TileIndex tile) { return GetAnimationFrame(tile); }
-	static void Set(Tobj *obj, TileIndex tile, byte frame) { SetAnimationFrame(tile, frame); }
+	static byte Get(Tobj *, TileIndex tile) { return GetAnimationFrame(tile); }
+	static void Set(Tobj *, TileIndex tile, byte frame) { SetAnimationFrame(tile, frame); }
 };
 
 /**
diff --git a/src/newgrf_canal.cpp b/src/newgrf_canal.cpp
index 99f2ec13ca..23be82a76a 100644
--- a/src/newgrf_canal.cpp
+++ b/src/newgrf_canal.cpp
@@ -30,7 +30,7 @@ struct CanalScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Resolver object for canals. */
@@ -59,7 +59,7 @@ struct CanalResolverObject : public ResolverObject {
 	return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0;
 }
 
-/* virtual */ uint32_t CanalScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t CanalScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	switch (variable) {
 		/* Height of tile */
diff --git a/src/newgrf_commons.h b/src/newgrf_commons.h
index 27cb74dba5..a52ebf78a9 100644
--- a/src/newgrf_commons.h
+++ b/src/newgrf_commons.h
@@ -197,7 +197,7 @@ protected:
 	uint16_t max_entities; ///< what is the amount of entities, old and new summed
 
 	uint16_t invalid_id;   ///< ID used to detected invalid entities
-	virtual bool CheckValidNewID(uint16_t testid) { return true; }
+	virtual bool CheckValidNewID([[maybe_unused]] uint16_t testid) { return true; }
 
 public:
 	std::vector<EntityIDMapping> mappings; ///< mapping of ids from grf files.  Public out of convenience
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 5c6e16576e..5bc4fb5182 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -226,9 +226,8 @@ void GRFParameterInfo::Finalize()
 /**
  * Update the palettes of the graphics from the config file.
  * Called when changing the default palette in advanced settings.
- * @param new_value Unused.
  */
-void UpdateNewGRFConfigPalette(int32_t new_value)
+void UpdateNewGRFConfigPalette(int32_t)
 {
 	for (GRFConfig *c = _grfconfig_newgame; c != nullptr; c = c->next) c->SetSuitablePalette();
 	for (GRFConfig *c = _grfconfig_static;  c != nullptr; c = c->next) c->SetSuitablePalette();
@@ -542,7 +541,7 @@ public:
 	}
 };
 
-bool GRFFileScanner::AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+bool GRFFileScanner::AddFile(const std::string &filename, size_t basepath_length, const std::string &)
 {
 	/* Abort if the user stopped the game during a scan. */
 	if (_exit_game) return false;
diff --git a/src/newgrf_debug_gui.cpp b/src/newgrf_debug_gui.cpp
index d7cd8e7495..0fc29e5715 100644
--- a/src/newgrf_debug_gui.cpp
+++ b/src/newgrf_debug_gui.cpp
@@ -184,7 +184,7 @@ public:
 	 * @param grfid Parameter for the PSA. Only required for items with parameters.
 	 * @return Size of the persistent storage in indices.
 	 */
-	virtual uint GetPSASize(uint index, uint32_t grfid) const
+	virtual uint GetPSASize([[maybe_unused]] uint index, [[maybe_unused]] uint32_t grfid) const
 	{
 		return 0;
 	}
@@ -195,7 +195,7 @@ public:
 	 * @param grfid Parameter for the PSA. Only required for items with parameters.
 	 * @return Pointer to the first position of the storage array or nullptr if not present.
 	 */
-	virtual const int32_t *GetPSAFirstPosition(uint index, uint32_t grfid) const
+	virtual const int32_t *GetPSAFirstPosition([[maybe_unused]] uint index, [[maybe_unused]] uint32_t grfid) const
 	{
 		return nullptr;
 	}
@@ -366,7 +366,7 @@ struct NewGRFInspectWindow : Window {
 		GetFeatureHelper(this->window_number)->SetStringParameters(this->GetFeatureIndex());
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NGRFI_VEH_CHAIN: {
@@ -555,7 +555,7 @@ struct NewGRFInspectWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NGRFI_PARENT: {
@@ -623,7 +623,7 @@ struct NewGRFInspectWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (this->HasChainIndex()) {
@@ -869,7 +869,7 @@ struct SpriteAlignerWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SA_SPRITE:
@@ -934,7 +934,7 @@ struct SpriteAlignerWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SA_PREVIOUS:
@@ -1044,7 +1044,7 @@ struct SpriteAlignerWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (data == 1) {
diff --git a/src/newgrf_engine.cpp b/src/newgrf_engine.cpp
index 8eac2b0d7a..603e839929 100644
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -954,7 +954,7 @@ static uint32_t VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *objec
 	return UINT_MAX;
 }
 
-/* virtual */ uint32_t VehicleScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t VehicleScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->v == nullptr) {
 		/* Vehicle does not exist, so we're in a purchase list */
diff --git a/src/newgrf_engine.h b/src/newgrf_engine.h
index 8b7d2654fe..4452ad9caf 100644
--- a/src/newgrf_engine.h
+++ b/src/newgrf_engine.h
@@ -39,7 +39,7 @@ struct VehicleScopeResolver : public ScopeResolver {
 	void SetVehicle(const Vehicle *v) { this->v = v; }
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 	uint32_t GetTriggers() const override;
 };
 
diff --git a/src/newgrf_generic.cpp b/src/newgrf_generic.cpp
index 6c8fc95487..dcd660793c 100644
--- a/src/newgrf_generic.cpp
+++ b/src/newgrf_generic.cpp
@@ -41,7 +41,7 @@ struct GenericScopeResolver : public ScopeResolver {
 	{
 	}
 
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 
 private:
 	bool ai_callback; ///< Callback comes from the AI.
@@ -118,7 +118,7 @@ void AddGenericCallback(uint8_t feature, const GRFFile *file, const SpriteGroup
 	_gcl[feature].push_front(GenericCallback(file, group));
 }
 
-/* virtual */ uint32_t GenericScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t GenericScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->ai_callback) {
 		switch (variable) {
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index 9a36d51f9a..acfe87ed58 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -208,7 +208,7 @@ struct NewGRFParametersWindow : public Window {
 		return this->HasParameterInfo(nr) ? this->grf_config->param_info[nr].value() : GetDummyParameterInfo(nr);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NP_NUMPAR_DEC:
@@ -329,7 +329,7 @@ struct NewGRFParametersWindow : public Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_NP_NUMPAR_DEC:
@@ -459,7 +459,7 @@ struct NewGRFParametersWindow : public Window {
 		this->SetDirty();
 	}
 
-	void OnDropdownClose(Point pt, int widget, int index, bool instant_close) override
+	void OnDropdownClose(Point, int widget, int, bool) override
 	{
 		/* We cannot raise the dropdown button just yet. OnClick needs some hint, whether
 		 * the same dropdown button was clicked again, and then not open the dropdown again.
@@ -480,7 +480,7 @@ struct NewGRFParametersWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		if (!this->action14present) {
@@ -733,7 +733,7 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_NS_FILE_LIST:
@@ -932,7 +932,7 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_NS_NEWGRF_TEXTFILE && widget < WID_NS_NEWGRF_TEXTFILE + TFT_CONTENT_END) {
 			if (this->active_sel == nullptr && this->avail_sel == nullptr) return;
@@ -1223,7 +1223,7 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 	 * @param data Information about the changed data. @see GameOptionsInvalidationData
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		switch (data) {
@@ -1334,7 +1334,7 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 		this->SetWidgetDisabledState(WID_NS_PRESET_SAVE, has_missing);
 	}
 
-	EventState OnKeyPress(char32_t key, uint16_t keycode) override
+	EventState OnKeyPress([[maybe_unused]] char32_t key, uint16_t keycode) override
 	{
 		if (!this->editable) return ES_NOT_HANDLED;
 
@@ -2086,7 +2086,7 @@ struct SavePresetWindow : public Window {
 	{
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SVP_PRESET_LIST: {
@@ -2127,7 +2127,7 @@ struct SavePresetWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SVP_PRESET_LIST: {
@@ -2201,7 +2201,7 @@ struct ScanProgressWindow : public Window {
 		this->InitNested(1);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SP_PROGRESS_BAR: {
diff --git a/src/newgrf_house.cpp b/src/newgrf_house.cpp
index ad05665a08..feab4c4fc0 100644
--- a/src/newgrf_house.cpp
+++ b/src/newgrf_house.cpp
@@ -294,7 +294,7 @@ static uint32_t GetDistanceFromNearbyHouse(uint8_t parameter, TileIndex tile, Ho
 /**
  * @note Used by the resolver to get values for feature 07 deterministic spritegroups.
  */
-/* virtual */ uint32_t HouseScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t HouseScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	switch (variable) {
 		/* Construction stage. */
diff --git a/src/newgrf_house.h b/src/newgrf_house.h
index 71e1390eea..296e9152be 100644
--- a/src/newgrf_house.h
+++ b/src/newgrf_house.h
@@ -43,7 +43,7 @@ struct HouseScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 	uint32_t GetTriggers() const override;
 };
 
diff --git a/src/newgrf_industries.cpp b/src/newgrf_industries.cpp
index acbf5c2d81..b25691267c 100644
--- a/src/newgrf_industries.cpp
+++ b/src/newgrf_industries.cpp
@@ -156,7 +156,7 @@ static uint32_t GetCountAndDistanceOfClosestInstance(byte param_setID, byte layo
 	return count << 16 | GB(closest_dist, 0, 16);
 }
 
-/* virtual */ uint32_t IndustriesScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t IndustriesScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->ro.callback == CBID_INDUSTRY_LOCATION) {
 		/* Variables available during construction check. */
diff --git a/src/newgrf_industries.h b/src/newgrf_industries.h
index d4be4bad68..4cae362258 100644
--- a/src/newgrf_industries.h
+++ b/src/newgrf_industries.h
@@ -33,7 +33,7 @@ struct IndustriesScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 	uint32_t GetTriggers() const override;
 	void StorePSA(uint pos, int32_t value) override;
 };
diff --git a/src/newgrf_industrytiles.cpp b/src/newgrf_industrytiles.cpp
index e24f5e0f80..62a4cd0c52 100644
--- a/src/newgrf_industrytiles.cpp
+++ b/src/newgrf_industrytiles.cpp
@@ -58,7 +58,7 @@ uint32_t GetRelativePosition(TileIndex tile, TileIndex ind_tile)
 	return ((y & 0xF) << 20) | ((x & 0xF) << 16) | (y << 8) | x;
 }
 
-/* virtual */ uint32_t IndustryTileScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t IndustryTileScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	switch (variable) {
 		/* Construction state of the tile: a value between 0 and 3 */
@@ -251,7 +251,7 @@ CommandCost PerformIndustryTileSlopeCheck(TileIndex ind_base_tile, TileIndex ind
 }
 
 /* Simple wrapper for GetHouseCallback to keep the animation unified. */
-uint16_t GetSimpleIndustryCallback(CallbackID callback, uint32_t param1, uint32_t param2, const IndustryTileSpec *spec, Industry *ind, TileIndex tile, int extra_data)
+uint16_t GetSimpleIndustryCallback(CallbackID callback, uint32_t param1, uint32_t param2, const IndustryTileSpec *spec, Industry *ind, TileIndex tile, int)
 {
 	return GetIndustryTileCallback(callback, param1, param2, spec - GetIndustryTileSpec(0), ind, tile);
 }
diff --git a/src/newgrf_industrytiles.h b/src/newgrf_industrytiles.h
index 79bc38d0ac..8d39a09d59 100644
--- a/src/newgrf_industrytiles.h
+++ b/src/newgrf_industrytiles.h
@@ -31,7 +31,7 @@ struct IndustryTileScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 	uint32_t GetTriggers() const override;
 };
 
diff --git a/src/newgrf_object.cpp b/src/newgrf_object.cpp
index 624f5cfebd..c6098d54c7 100644
--- a/src/newgrf_object.cpp
+++ b/src/newgrf_object.cpp
@@ -253,7 +253,7 @@ static uint32_t GetCountAndDistanceOfClosestInstance(byte local_id, uint32_t grf
 }
 
 /** Used by the resolver to get values for feature 0F deterministic spritegroups. */
-/* virtual */ uint32_t ObjectScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t ObjectScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	/* We get the town from the object, or we calculate the closest
 	 * town if we need to when there's no object. */
@@ -524,10 +524,9 @@ void DrawNewObjectTileInGUI(int x, int y, const ObjectSpec *spec, uint8_t view)
  * @param spec     The specification of the object / the entry point.
  * @param o        The object to call the callback for.
  * @param tile     The tile the callback is called for.
- * @param extra_data Ignored.
  * @return The result of the callback.
  */
-uint16_t StubGetObjectCallback(CallbackID callback, uint32_t param1, uint32_t param2, const ObjectSpec *spec, Object *o, TileIndex tile, int extra_data)
+uint16_t StubGetObjectCallback(CallbackID callback, uint32_t param1, uint32_t param2, const ObjectSpec *spec, Object *o, TileIndex tile, int)
 {
 	return GetObjectCallback(callback, param1, param2, spec, o, tile);
 }
diff --git a/src/newgrf_object.h b/src/newgrf_object.h
index 2940f96440..644463674f 100644
--- a/src/newgrf_object.h
+++ b/src/newgrf_object.h
@@ -127,7 +127,7 @@ struct ObjectScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** A resolver object to be used with feature 0F spritegroups. */
diff --git a/src/newgrf_railtype.cpp b/src/newgrf_railtype.cpp
index a95d686d45..1598a4d392 100644
--- a/src/newgrf_railtype.cpp
+++ b/src/newgrf_railtype.cpp
@@ -23,7 +23,7 @@
 	return GB(tmp, 0, 2);
 }
 
-/* virtual */ uint32_t RailTypeScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t RailTypeScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->tile == INVALID_TILE) {
 		switch (variable) {
diff --git a/src/newgrf_railtype.h b/src/newgrf_railtype.h
index af07556aef..d15f31d704 100644
--- a/src/newgrf_railtype.h
+++ b/src/newgrf_railtype.h
@@ -32,7 +32,7 @@ struct RailTypeScopeResolver : public ScopeResolver {
 	}
 
 	uint32_t GetRandomBits() const override;
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Resolver object for rail types. */
diff --git a/src/newgrf_roadstop.cpp b/src/newgrf_roadstop.cpp
index bce9b5f21a..983bc0d06e 100644
--- a/src/newgrf_roadstop.cpp
+++ b/src/newgrf_roadstop.cpp
@@ -38,7 +38,7 @@ void NewGRFClass<Tspec, Tid, Tmax>::InsertDefaults()
 }
 
 template <typename Tspec, typename Tid, Tid Tmax>
-bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint index) const
+bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint) const
 {
 	return true;
 }
@@ -63,7 +63,7 @@ uint32_t RoadStopScopeResolver::GetTriggers() const
 	return this->st == nullptr ? 0 : this->st->waiting_triggers;
 }
 
-uint32_t RoadStopScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+uint32_t RoadStopScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	auto get_road_type_variable = [&](RoadTramType rtt) -> uint32_t {
 		RoadType rt;
@@ -305,7 +305,7 @@ void DrawRoadStopTile(int x, int y, RoadType roadtype, const RoadStopSpec *spec,
 }
 
 /** Wrapper for animation control, see GetRoadStopCallback. */
-uint16_t GetAnimRoadStopCallback(CallbackID callback, uint32_t param1, uint32_t param2, const RoadStopSpec *roadstopspec, BaseStation *st, TileIndex tile, int extra_data)
+uint16_t GetAnimRoadStopCallback(CallbackID callback, uint32_t param1, uint32_t param2, const RoadStopSpec *roadstopspec, BaseStation *st, TileIndex tile, int)
 {
 	return GetRoadStopCallback(callback, param1, param2, roadstopspec, st, tile, INVALID_ROADTYPE, GetStationType(tile), GetStationGfx(tile));
 }
diff --git a/src/newgrf_roadstop.h b/src/newgrf_roadstop.h
index 0e453a76e3..87803dc8bc 100644
--- a/src/newgrf_roadstop.h
+++ b/src/newgrf_roadstop.h
@@ -89,7 +89,7 @@ struct RoadStopScopeResolver : public ScopeResolver {
 	uint32_t GetRandomBits() const override;
 	uint32_t GetTriggers() const override;
 
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Road stop resolver. */
diff --git a/src/newgrf_roadtype.cpp b/src/newgrf_roadtype.cpp
index ab2897deaf..8e3f7ce7b5 100644
--- a/src/newgrf_roadtype.cpp
+++ b/src/newgrf_roadtype.cpp
@@ -23,7 +23,7 @@
 	return GB(tmp, 0, 2);
 }
 
-/* virtual */ uint32_t RoadTypeScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t RoadTypeScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->tile == INVALID_TILE) {
 		switch (variable) {
diff --git a/src/newgrf_roadtype.h b/src/newgrf_roadtype.h
index dc7acf636d..fb9194f623 100644
--- a/src/newgrf_roadtype.h
+++ b/src/newgrf_roadtype.h
@@ -33,7 +33,7 @@ struct RoadTypeScopeResolver : public ScopeResolver {
 	}
 
 	/* virtual */ uint32_t GetRandomBits() const;
-	/* virtual */ uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const;
+	/* virtual */ uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const;
 };
 
 /** Resolver object for road types. */
diff --git a/src/newgrf_spritegroup.cpp b/src/newgrf_spritegroup.cpp
index e8ab9e6cba..d63f4061cc 100644
--- a/src/newgrf_spritegroup.cpp
+++ b/src/newgrf_spritegroup.cpp
@@ -103,7 +103,7 @@ static inline uint32_t GetVariable(const ResolverObject &object, ScopeResolver *
  * @param[out] available Set to false, in case the variable does not exist.
  * @return Value
  */
-/* virtual */ uint32_t ScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t ScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	Debug(grf, 1, "Unhandled scope variable 0x{:X}", variable);
 	*available = false;
@@ -112,10 +112,8 @@ static inline uint32_t GetVariable(const ResolverObject &object, ScopeResolver *
 
 /**
  * Store a value into the persistent storage area (PSA). Default implementation does nothing (for newgrf classes without storage).
- * @param reg Position to store into.
- * @param value Value to store.
  */
-/* virtual */ void ScopeResolver::StorePSA(uint reg, int32_t value) {}
+/* virtual */ void ScopeResolver::StorePSA(uint, int32_t) {}
 
 /**
  * Get the real sprites of the grf.
@@ -132,11 +130,9 @@ static inline uint32_t GetVariable(const ResolverObject &object, ScopeResolver *
 
 /**
  * Get a resolver for the \a scope.
- * @param scope Scope to return.
- * @param relative Additional parameter for #VSG_SCOPE_RELATIVE.
  * @return The resolver for the requested scope.
  */
-/* virtual */ ScopeResolver *ResolverObject::GetScope(VarSpriteGroupScope scope, byte relative)
+/* virtual */ ScopeResolver *ResolverObject::GetScope(VarSpriteGroupScope, byte)
 {
 	return &this->default_scope;
 }
diff --git a/src/newgrf_spritegroup.h b/src/newgrf_spritegroup.h
index 9940cea163..c01f64f817 100644
--- a/src/newgrf_spritegroup.h
+++ b/src/newgrf_spritegroup.h
@@ -58,7 +58,7 @@ struct SpriteGroup : SpriteGroupPool::PoolItem<&_spritegroup_pool> {
 protected:
 	SpriteGroup(SpriteGroupType type) : nfo_line(0), type(type) {}
 	/** Base sprite group resolver */
-	virtual const SpriteGroup *Resolve(ResolverObject &object) const { return this; };
+	virtual const SpriteGroup *Resolve([[maybe_unused]] ResolverObject &object) const { return this; };
 
 public:
 	virtual ~SpriteGroup() = default;
@@ -294,7 +294,7 @@ struct ScopeResolver {
 	virtual uint32_t GetRandomBits() const;
 	virtual uint32_t GetTriggers() const;
 
-	virtual uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const;
+	virtual uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const;
 	virtual void StorePSA(uint reg, int32_t value);
 };
 
diff --git a/src/newgrf_station.cpp b/src/newgrf_station.cpp
index fa120d3b23..35202de1ef 100644
--- a/src/newgrf_station.cpp
+++ b/src/newgrf_station.cpp
@@ -39,7 +39,7 @@ template <typename Tspec, typename Tid, Tid Tmax>
 }
 
 template <typename Tspec, typename Tid, Tid Tmax>
-bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint index) const
+bool NewGRFClass<Tspec, Tid, Tmax>::IsUIAvailable(uint) const
 {
 	return true;
 }
@@ -266,7 +266,7 @@ TownScopeResolver *StationResolverObject::GetTown()
 	return this->town_scope;
 }
 
-/* virtual */ uint32_t StationScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t StationScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	if (this->st == nullptr) {
 		/* Station does not exist, so we're in a purchase list or the land slope check callback. */
@@ -458,7 +458,7 @@ uint32_t Station::GetNewGRFVariable(const ResolverObject &object, byte variable,
 	return UINT_MAX;
 }
 
-uint32_t Waypoint::GetNewGRFVariable(const ResolverObject &object, byte variable, byte parameter, bool *available) const
+uint32_t Waypoint::GetNewGRFVariable(const ResolverObject &, byte variable, [[maybe_unused]] byte parameter, bool *available) const
 {
 	switch (variable) {
 		case 0x48: return 0; // Accepted cargo types
@@ -886,7 +886,7 @@ bool CanStationTileHaveWires(TileIndex tile)
 }
 
 /** Wrapper for animation control, see GetStationCallback. */
-uint16_t GetAnimStationCallback(CallbackID callback, uint32_t param1, uint32_t param2, const StationSpec *statspec, BaseStation *st, TileIndex tile, int extra_data)
+uint16_t GetAnimStationCallback(CallbackID callback, uint32_t param1, uint32_t param2, const StationSpec *statspec, BaseStation *st, TileIndex tile, int)
 {
 	return GetStationCallback(callback, param1, param2, statspec, st, tile);
 }
diff --git a/src/newgrf_station.h b/src/newgrf_station.h
index b8be9935b8..885af41e27 100644
--- a/src/newgrf_station.h
+++ b/src/newgrf_station.h
@@ -43,7 +43,7 @@ struct StationScopeResolver : public ScopeResolver {
 	uint32_t GetRandomBits() const override;
 	uint32_t GetTriggers() const override;
 
-	uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const override;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Station resolver. */
diff --git a/src/newgrf_storage.cpp b/src/newgrf_storage.cpp
index d333a939f8..b071c3c743 100644
--- a/src/newgrf_storage.cpp
+++ b/src/newgrf_storage.cpp
@@ -51,7 +51,7 @@ void AddChangedPersistentStorage(BasePersistentStorageArray *storage)
  * @param mode Mode switch affecting temporary/persistent changes.
  * @param ignore_prev_mode Disable some sanity checks for exceptional call circumstances.
  */
-/* static */ void BasePersistentStorageArray::SwitchMode(PersistentStorageMode mode, bool ignore_prev_mode)
+/* static */ void BasePersistentStorageArray::SwitchMode(PersistentStorageMode mode, [[maybe_unused]] bool ignore_prev_mode)
 {
 	switch (mode) {
 		case PSM_ENTER_GAMELOOP:
diff --git a/src/newgrf_town.cpp b/src/newgrf_town.cpp
index 6250690c42..5f8f5972c8 100644
--- a/src/newgrf_town.cpp
+++ b/src/newgrf_town.cpp
@@ -15,7 +15,7 @@
 
 #include "safeguards.h"
 
-/* virtual */ uint32_t TownScopeResolver::GetVariable(byte variable, uint32_t parameter, bool *available) const
+/* virtual */ uint32_t TownScopeResolver::GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const
 {
 	switch (variable) {
 		/* Larger towns */
diff --git a/src/newgrf_town.h b/src/newgrf_town.h
index 976243c074..f63f2794b1 100644
--- a/src/newgrf_town.h
+++ b/src/newgrf_town.h
@@ -34,7 +34,7 @@ struct TownScopeResolver : public ScopeResolver {
 	{
 	}
 
-	virtual uint32_t GetVariable(byte variable, uint32_t parameter, bool *available) const;
+	virtual uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const;
 	virtual void StorePSA(uint reg, int32_t value);
 };
 
diff --git a/src/news_gui.cpp b/src/news_gui.cpp
index 383dbc082a..2295009fe5 100644
--- a/src/news_gui.cpp
+++ b/src/news_gui.cpp
@@ -336,13 +336,13 @@ struct NewsWindow : Window {
 		GfxFillRect( r.left,  ir.bottom,  r.right,  r.bottom, PC_BLACK);
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = { 0, _screen.height };
 		return pt;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		StringID str = STR_NULL;
 		switch (widget) {
@@ -478,7 +478,7 @@ struct NewsWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_N_CLOSEBOX:
@@ -540,7 +540,7 @@ struct NewsWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* The chatbar has notified us that is was either created or closed */
@@ -549,7 +549,7 @@ struct NewsWindow : Window {
 		this->SetWindowTop(newtop);
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		/* Decrement the news timer. We don't need to action an elapsed event here,
 		 * so no need to use TimerElapsed(). */
@@ -1126,7 +1126,7 @@ struct MessageHistoryWindow : Window {
 		this->OnInvalidateData(0);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_MH_BACKGROUND) {
 			this->line_height = FONT_HEIGHT_NORMAL + WidgetDimensions::scaled.vsep_normal;
@@ -1181,13 +1181,13 @@ struct MessageHistoryWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->vscroll->SetCount(_total_news);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget == WID_MH_BACKGROUND) {
 			NewsItem *ni = _latest_news;
diff --git a/src/object_cmd.cpp b/src/object_cmd.cpp
index 3be124e5fd..fb39133dc7 100644
--- a/src/object_cmd.cpp
+++ b/src/object_cmd.cpp
@@ -486,7 +486,7 @@ static void DrawTile_Object(TileInfo *ti)
 	DrawBridgeMiddle(ti);
 }
 
-static int GetSlopePixelZ_Object(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Object(TileIndex tile, uint x, uint y, bool)
 {
 	if (IsObjectType(tile, OBJECT_OWNED_LAND)) {
 		int z;
@@ -700,7 +700,7 @@ static void TileLoop_Object(TileIndex tile)
 }
 
 
-static TrackStatus GetTileTrackStatus_Object(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Object(TileIndex, TransportType, uint, DiagDirection)
 {
 	return 0;
 }
@@ -721,10 +721,9 @@ static void AnimateTile_Object(TileIndex tile)
 /**
  * Helper function for \c CircularTileSearch.
  * @param tile The tile to check.
- * @param user Ignored.
  * @return True iff the tile has a radio tower.
  */
-static bool HasTransmitter(TileIndex tile, void *user)
+static bool HasTransmitter(TileIndex tile, void *)
 {
 	return IsObjectTypeTile(tile, OBJECT_TRANSMITTER);
 }
diff --git a/src/object_gui.cpp b/src/object_gui.cpp
index f7f6fb8de7..8e43bdf554 100644
--- a/src/object_gui.cpp
+++ b/src/object_gui.cpp
@@ -222,7 +222,7 @@ public:
 		this->object_margin = ScaleGUITrad(4);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BO_CLASS_LIST: {
@@ -490,7 +490,7 @@ public:
 		this->SetDirty();
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -502,7 +502,7 @@ public:
 		this->vscroll->SetCapacityFromWidget(this, WID_BO_CLASS_LIST);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (GB(widget, 0, 16)) {
 			case WID_BO_CLASS_LIST: {
@@ -530,7 +530,7 @@ public:
 		}
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		const ObjectSpec *spec = ObjectClass::Get(_selected_object_class)->GetSpec(_selected_object_index);
 
@@ -541,12 +541,12 @@ public:
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x == -1) return;
 
diff --git a/src/order_base.h b/src/order_base.h
index 89d00a3d48..c607d97942 100644
--- a/src/order_base.h
+++ b/src/order_base.h
@@ -359,7 +359,7 @@ public:
 	 *       into the shared vehicle chain.
 	 * @param v vehicle to add to the list
 	 */
-	inline void AddVehicle(Vehicle *v) { ++this->num_vehicles; }
+	inline void AddVehicle([[maybe_unused]] Vehicle *v) { ++this->num_vehicles; }
 
 	void RemoveVehicle(Vehicle *v);
 
diff --git a/src/order_gui.cpp b/src/order_gui.cpp
index 61595f4391..62742cb0e3 100644
--- a/src/order_gui.cpp
+++ b/src/order_gui.cpp
@@ -801,7 +801,7 @@ public:
 		this->OnInvalidateData(VIWD_MODIFY_ORDERS);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_O_ORDER_LIST:
@@ -838,7 +838,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		VehicleOrderID from = INVALID_VEH_ORDER_ID;
 		VehicleOrderID to   = INVALID_VEH_ORDER_ID;
@@ -1161,7 +1161,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_O_ORDER_LIST: {
@@ -1448,7 +1448,7 @@ public:
 		return ES_HANDLED;
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		if (this->goto_type == OPOS_GOTO) {
 			const Order cmd = GetOrderCmdFromTile(this->vehicle, tile);
diff --git a/src/os/macosx/crashlog_osx.cpp b/src/os/macosx/crashlog_osx.cpp
index 391a508143..3f8b7fe7ec 100644
--- a/src/os/macosx/crashlog_osx.cpp
+++ b/src/os/macosx/crashlog_osx.cpp
@@ -177,9 +177,8 @@ static sigset_t SetSignals(void(*handler)(int))
 /**
  * Entry point for a crash that happened during the handling of a crash.
  *
- * @param signum the signal that caused us to crash.
  */
-static void CDECL HandleInternalCrash(int signum)
+static void CDECL HandleInternalCrash(int)
 {
 	if (CrashLogOSX::current == nullptr || !CrashLogOSX::current->try_execute_active) {
 		fmt::print("Something went seriously wrong when creating the crash log. Aborting.\n");
diff --git a/src/os/macosx/font_osx.cpp b/src/os/macosx/font_osx.cpp
index 23737fc564..2eed279c1d 100644
--- a/src/os/macosx/font_osx.cpp
+++ b/src/os/macosx/font_osx.cpp
@@ -24,7 +24,7 @@
 
 #include "safeguards.h"
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int winlangid, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int, MissingGlyphSearcher *callback)
 {
 	/* Determine fallback font using CoreText. This uses the language isocode
 	 * to find a suitable font. CoreText is available from 10.5 onwards. */
diff --git a/src/os/unix/crashlog_unix.cpp b/src/os/unix/crashlog_unix.cpp
index f232bd121c..70cdc7be68 100644
--- a/src/os/unix/crashlog_unix.cpp
+++ b/src/os/unix/crashlog_unix.cpp
@@ -53,7 +53,7 @@ class CrashLogUnix : public CrashLog {
 		survey["reason"] = strsignal(signum);
 	}
 
-	void SurveyStacktrace(nlohmann::json &survey) const override
+	void SurveyStacktrace([[maybe_unused]] nlohmann::json &survey) const override
 	{
 #if defined(__GLIBC__)
 		void *trace[64];
@@ -166,7 +166,7 @@ static sigset_t SetSignals(void(*handler)(int))
  *
  * @param signum the signal that caused us to crash.
  */
-static void CDECL HandleInternalCrash(int signum)
+static void CDECL HandleInternalCrash([[maybe_unused]] int signum)
 {
 	if (CrashLogUnix::current == nullptr || !CrashLogUnix::current->try_execute_active) {
 		fmt::print("Something went seriously wrong when creating the crash log. Aborting.\n");
diff --git a/src/os/unix/font_unix.cpp b/src/os/unix/font_unix.cpp
index 9e08aecdb7..87eac16384 100644
--- a/src/os/unix/font_unix.cpp
+++ b/src/os/unix/font_unix.cpp
@@ -95,7 +95,7 @@ FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
 	return err;
 }
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int winlangid, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int, MissingGlyphSearcher *callback)
 {
 	bool ret = false;
 
diff --git a/src/os/unix/unix.cpp b/src/os/unix/unix.cpp
index f641bedcfd..b178581529 100644
--- a/src/os/unix/unix.cpp
+++ b/src/os/unix/unix.cpp
@@ -59,7 +59,7 @@ bool FiosIsRoot(const std::string &path)
 	return path == PATHSEP;
 }
 
-void FiosGetDrives(FileList &file_list)
+void FiosGetDrives(FileList &)
 {
 	return;
 }
@@ -199,7 +199,7 @@ void ShowInfoI(const std::string &str)
 }
 
 #if !defined(__APPLE__)
-void ShowOSErrorBox(const char *buf, bool system)
+void ShowOSErrorBox(const char *buf, bool)
 {
 	/* All unix systems, except OSX. Only use escape codes on a TTY. */
 	if (isatty(fileno(stderr))) {
@@ -251,7 +251,7 @@ void OSOpenBrowser(const char *url)
 }
 #endif /* __APPLE__ */
 
-void SetCurrentThreadName(const char *threadName) {
+void SetCurrentThreadName([[maybe_unused]] const char *threadName) {
 #if defined(__GLIBC__)
 	if (threadName) pthread_setname_np(pthread_self(), threadName);
 #endif /* defined(__GLIBC__) */
diff --git a/src/os/windows/crashlog_win.cpp b/src/os/windows/crashlog_win.cpp
index 281c090b50..7c05e81429 100644
--- a/src/os/windows/crashlog_win.cpp
+++ b/src/os/windows/crashlog_win.cpp
@@ -98,7 +98,7 @@ class CrashLogWindows : public CrashLog {
 public:
 
 #ifdef WITH_UNOFFICIAL_BREAKPAD
-	static bool MinidumpCallback(const wchar_t *dump_dir, const wchar_t *minidump_id, void *context, EXCEPTION_POINTERS *exinfo, MDRawAssertionInfo *assertion, bool succeeded)
+	static bool MinidumpCallback(const wchar_t *dump_dir, const wchar_t *minidump_id, void *context, EXCEPTION_POINTERS *, MDRawAssertionInfo *, bool succeeded)
 	{
 		CrashLogWindows *crashlog = reinterpret_cast<CrashLogWindows *>(context);
 
@@ -287,7 +287,7 @@ static const uint MAX_FRAMES     = 64;
 	}
 }
 #else
-/* virtual */ void CrashLogWindows::SurveyStacktrace(nlohmann::json &survey) const
+/* virtual */ void CrashLogWindows::SurveyStacktrace(nlohmann::json &) const
 {
 	/* Not supported. */
 }
@@ -380,7 +380,7 @@ static LONG WINAPI VectoredExceptionHandler(EXCEPTION_POINTERS *ep)
 	return EXCEPTION_CONTINUE_SEARCH;
 }
 
-static void CDECL CustomAbort(int signal)
+static void CDECL CustomAbort(int)
 {
 	RaiseException(CUSTOM_ABORT_EXCEPTION, 0, 0, nullptr);
 }
@@ -461,7 +461,7 @@ static void SetWndSize(HWND wnd, int mode)
 	}
 }
 
-static INT_PTR CALLBACK CrashDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam)
+static INT_PTR CALLBACK CrashDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARAM)
 {
 	switch (msg) {
 		case WM_INITDIALOG: {
diff --git a/src/os/windows/font_win32.cpp b/src/os/windows/font_win32.cpp
index 286702e0e9..4d92ee0217 100644
--- a/src/os/windows/font_win32.cpp
+++ b/src/os/windows/font_win32.cpp
@@ -88,7 +88,7 @@ static int CALLBACK EnumFontCallback(const ENUMLOGFONTEX *logfont, const NEWTEXT
 	return 0; // stop enumerating
 }
 
-bool SetFallbackFont(FontCacheSettings *settings, const std::string &language_isocode, int winlangid, MissingGlyphSearcher *callback)
+bool SetFallbackFont(FontCacheSettings *settings, const std::string &, int winlangid, MissingGlyphSearcher *callback)
 {
 	Debug(fontcache, 1, "Trying fallback fonts");
 	EFCParam langInfo;
diff --git a/src/os/windows/win32.cpp b/src/os/windows/win32.cpp
index 49693ffe8d..3611dfe1af 100644
--- a/src/os/windows/win32.cpp
+++ b/src/os/windows/win32.cpp
@@ -45,7 +45,7 @@ bool MyShowCursor(bool show, bool toggle)
 	return !show;
 }
 
-void ShowOSErrorBox(const char *buf, bool system)
+void ShowOSErrorBox(const char *buf, bool)
 {
 	MyShowCursor(true);
 	MessageBox(GetActiveWindow(), OTTD2FS(buf).c_str(), L"Error!", MB_ICONSTOP | MB_TASKMODAL);
@@ -190,7 +190,7 @@ void FiosGetDrives(FileList &file_list)
 	}
 }
 
-bool FiosIsValidFile(const std::string &path, const struct dirent *ent, struct stat *sb)
+bool FiosIsValidFile(const std::string &, const struct dirent *ent, struct stat *sb)
 {
 	/* hectonanoseconds between Windows and POSIX epoch */
 	static const int64_t posix_epoch_hns = 0x019DB1DED53E8000LL;
@@ -283,7 +283,7 @@ void CreateConsole()
 static const char *_help_msg;
 
 /** Callback function to handle the window */
-static INT_PTR CALLBACK HelpDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam)
+static INT_PTR CALLBACK HelpDialogFunc(HWND wnd, UINT msg, WPARAM wParam, LPARAM)
 {
 	switch (msg) {
 		case WM_INITDIALOG: {
diff --git a/src/os/windows/win32_main.cpp b/src/os/windows/win32_main.cpp
index 745d35cbab..ebc22ffc71 100644
--- a/src/os/windows/win32_main.cpp
+++ b/src/os/windows/win32_main.cpp
@@ -51,7 +51,7 @@ static int ParseCommandLine(char *line, char **argv, int max_argc)
 
 void CreateConsole();
 
-int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
+int APIENTRY WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
 {
 	/* Set system timer resolution to 1ms. */
 	timeBeginPeriod(1);
diff --git a/src/osk_gui.cpp b/src/osk_gui.cpp
index 6c189e343f..4f4e56737b 100644
--- a/src/osk_gui.cpp
+++ b/src/osk_gui.cpp
@@ -101,7 +101,7 @@ struct OskWindow : public Window {
 		DrawCharCentered(_keyboard[this->shift][widget], r, TC_BLACK);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		/* clicked a letter */
 		if (widget >= WID_OSK_LETTERS) {
@@ -190,7 +190,7 @@ struct OskWindow : public Window {
 		this->parent->SetWidgetDirty(this->text_btn);
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->SetWidgetDirty(WID_OSK_TEXT);
diff --git a/src/pathfinder/npf/npf.cpp b/src/pathfinder/npf/npf.cpp
index c1bf1ba44e..0868d97519 100644
--- a/src/pathfinder/npf/npf.cpp
+++ b/src/pathfinder/npf/npf.cpp
@@ -148,7 +148,7 @@ static uint NPFHash(TileIndex tile, Trackdir dir)
 	return ((part1 << NPF_HASH_HALFBITS | part2) + (NPF_HASH_SIZE * dir / TRACKDIR_END)) % NPF_HASH_SIZE;
 }
 
-static int32_t NPFCalcZero(AyStar *as, AyStarNode *current, OpenListNode *parent)
+static int32_t NPFCalcZero(AyStar *, AyStarNode *, OpenListNode *)
 {
 	return 0;
 }
@@ -156,7 +156,7 @@ static int32_t NPFCalcZero(AyStar *as, AyStarNode *current, OpenListNode *parent
 /* Calculates the heuristic to the target station or tile. For train stations, it
  * takes into account the direction of approach.
  */
-static int32_t NPFCalcStationOrTileHeuristic(AyStar *as, AyStarNode *current, OpenListNode *parent)
+static int32_t NPFCalcStationOrTileHeuristic(AyStar *as, AyStarNode *current, OpenListNode *)
 {
 	NPFFindStationOrTileData *fstd = (NPFFindStationOrTileData*)as->user_target;
 	NPFFoundTargetData *ftd = (NPFFoundTargetData*)as->user_path;
@@ -312,7 +312,7 @@ static Vehicle *CountShipProc(Vehicle *v, void *data)
 	return nullptr;
 }
 
-static int32_t NPFWaterPathCost(AyStar *as, AyStarNode *current, OpenListNode *parent)
+static int32_t NPFWaterPathCost(AyStar *, AyStarNode *current, OpenListNode *parent)
 {
 	int32_t cost = 0;
 	Trackdir trackdir = current->direction;
@@ -340,7 +340,7 @@ static int32_t NPFWaterPathCost(AyStar *as, AyStarNode *current, OpenListNode *p
 }
 
 /* Determine the cost of this node, for road tracks */
-static int32_t NPFRoadPathCost(AyStar *as, AyStarNode *current, OpenListNode *parent)
+static int32_t NPFRoadPathCost(AyStar *, AyStarNode *current, OpenListNode *)
 {
 	TileIndex tile = current->tile;
 	int32_t cost = 0;
diff --git a/src/pathfinder/npf/queue.cpp b/src/pathfinder/npf/queue.cpp
index 0bd9046906..66b05004b4 100644
--- a/src/pathfinder/npf/queue.cpp
+++ b/src/pathfinder/npf/queue.cpp
@@ -130,7 +130,7 @@ bool BinaryHeap::Push(void *item, int priority)
  * known, which speeds up the deleting for some queue's. Should be -1
  * if not known.
  */
-bool BinaryHeap::Delete(void *item, int priority)
+bool BinaryHeap::Delete(void *item, int)
 {
 	uint i = 0;
 
diff --git a/src/pathfinder/yapf/yapf_costcache.hpp b/src/pathfinder/yapf/yapf_costcache.hpp
index a1cd0625a9..2f453b846a 100644
--- a/src/pathfinder/yapf/yapf_costcache.hpp
+++ b/src/pathfinder/yapf/yapf_costcache.hpp
@@ -28,7 +28,7 @@ public:
 	 * Called by YAPF to attach cached or local segment cost data to the given node.
 	 *  @return true if globally cached data were used or false if local data was used
 	 */
-	inline bool PfNodeCacheFetch(Node &n)
+	inline bool PfNodeCacheFetch(Node &)
 	{
 		return false;
 	}
@@ -37,7 +37,7 @@ public:
 	 * Called by YAPF to flush the cached segment cost data back into cache storage.
 	 *  Current cache implementation doesn't use that.
 	 */
-	inline void PfNodeCacheFlush(Node &n)
+	inline void PfNodeCacheFlush(Node &)
 	{
 	}
 };
@@ -84,7 +84,7 @@ public:
 	 * Called by YAPF to flush the cached segment cost data back into cache storage.
 	 *  Current cache implementation doesn't use that.
 	 */
-	inline void PfNodeCacheFlush(Node &n)
+	inline void PfNodeCacheFlush(Node &)
 	{
 	}
 };
@@ -101,7 +101,7 @@ struct CSegmentCostCacheBase
 {
 	static int   s_rail_change_counter;
 
-	static void NotifyTrackLayoutChange(TileIndex tile, Track track)
+	static void NotifyTrackLayoutChange(TileIndex, Track)
 	{
 		s_rail_change_counter++;
 	}
@@ -213,7 +213,7 @@ public:
 	 * Called by YAPF to flush the cached segment cost data back into cache storage.
 	 *  Current cache implementation doesn't use that.
 	 */
-	inline void PfNodeCacheFlush(Node &n)
+	inline void PfNodeCacheFlush(Node &)
 	{
 	}
 };
diff --git a/src/pathfinder/yapf/yapf_destrail.hpp b/src/pathfinder/yapf/yapf_destrail.hpp
index 1c41579cba..e9167d3fdb 100644
--- a/src/pathfinder/yapf/yapf_destrail.hpp
+++ b/src/pathfinder/yapf/yapf_destrail.hpp
@@ -52,7 +52,7 @@ public:
 	}
 
 	/** Called by YAPF to detect if node ends in the desired destination */
-	inline bool PfDetectDestination(TileIndex tile, Trackdir td)
+	inline bool PfDetectDestination(TileIndex tile, Trackdir)
 	{
 		bool bDest = IsRailDepotTile(tile);
 		return bDest;
diff --git a/src/pathfinder/yapf/yapf_rail.cpp b/src/pathfinder/yapf/yapf_rail.cpp
index 1b6f1a2528..ee7ba618be 100644
--- a/src/pathfinder/yapf/yapf_rail.cpp
+++ b/src/pathfinder/yapf/yapf_rail.cpp
@@ -417,7 +417,7 @@ public:
 		return result1;
 	}
 
-	inline Trackdir ChooseRailTrack(const Train *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool &path_found, bool reserve_track, PBSTileInfo *target, TileIndex *dest)
+	inline Trackdir ChooseRailTrack(const Train *v, TileIndex, DiagDirection, TrackBits, bool &path_found, bool reserve_track, PBSTileInfo *target, TileIndex *dest)
 	{
 		if (target != nullptr) target->tile = INVALID_TILE;
 		if (dest != nullptr) *dest = INVALID_TILE;
diff --git a/src/pathfinder/yapf/yapf_road.cpp b/src/pathfinder/yapf/yapf_road.cpp
index 5d47aace83..13854dbfcc 100644
--- a/src/pathfinder/yapf/yapf_road.cpp
+++ b/src/pathfinder/yapf/yapf_road.cpp
@@ -35,7 +35,7 @@ protected:
 		return *static_cast<Tpf *>(this);
 	}
 
-	int SlopeCost(TileIndex tile, TileIndex next_tile, Trackdir trackdir)
+	int SlopeCost(TileIndex tile, TileIndex next_tile, Trackdir)
 	{
 		/* height of the center of the current tile */
 		int x1 = TileX(tile) * TILE_SIZE;
@@ -109,7 +109,7 @@ public:
 	 *  Calculates only the cost of given node, adds it to the parent node cost
 	 *  and stores the result into Node::m_cost member
 	 */
-	inline bool PfCalcCost(Node &n, const TrackFollower *tf)
+	inline bool PfCalcCost(Node &n, const TrackFollower *)
 	{
 		int segment_cost = 0;
 		uint tiles = 0;
@@ -202,7 +202,7 @@ public:
 		return IsRoadDepotTile(n.m_segment_last_tile);
 	}
 
-	inline bool PfDetectDestinationTile(TileIndex tile, Trackdir trackdir)
+	inline bool PfDetectDestinationTile(TileIndex tile, Trackdir)
 	{
 		return IsRoadDepotTile(tile);
 	}
diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
index 762f2bf855..46d6f9a030 100644
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -2566,7 +2566,7 @@ void DrawTrainDepotSprite(int x, int y, int dir, RailType railtype)
 	DrawRailTileSeqInGUI(x, y, dts, offset, 0, palette);
 }
 
-static int GetSlopePixelZ_Track(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Track(TileIndex tile, uint x, uint y, bool)
 {
 	if (IsPlainRail(tile)) {
 		int z;
@@ -2709,7 +2709,7 @@ set_ground:
 }
 
 
-static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Track(TileIndex tile, TransportType mode, uint, DiagDirection side)
 {
 	/* Case of half tile slope with water. */
 	if (mode == TRANSPORT_WATER && IsPlainRail(tile) && GetRailGroundType(tile) == RAIL_GROUND_WATER && IsSlopeWithOneCornerRaised(GetTileSlope(tile))) {
@@ -3034,7 +3034,7 @@ static CommandCost TestAutoslopeOnRailTile(TileIndex tile, uint flags, int z_old
 /**
  * Test-procedure for HasVehicleOnPos to check for a ship.
  */
-static Vehicle *EnsureNoShipProc(Vehicle *v, void *data)
+static Vehicle *EnsureNoShipProc(Vehicle *v, void *)
 {
 	return v->type == VEH_SHIP ? v : nullptr;
 }
diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
index 675f27b872..2bf47f86a9 100644
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -89,7 +89,7 @@ static bool IsStationAvailable(const StationSpec *statspec)
 	return Convert8bitBooleanCallback(statspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res);
 }
 
-void CcPlaySound_CONSTRUCTION_RAIL(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcPlaySound_CONSTRUCTION_RAIL(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
 }
@@ -135,7 +135,7 @@ static const DiagDirection _place_depot_extra_dir[12] = {
 	DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_NW, DIAGDIR_NE,
 };
 
-void CcRailDepot(Commands cmd, const CommandCost &result, TileIndex tile, RailType rt, DiagDirection dir)
+void CcRailDepot(Commands, const CommandCost &result, TileIndex tile, RailType, DiagDirection dir)
 {
 	if (result.Failed()) return;
 
@@ -174,7 +174,7 @@ static void PlaceRail_Waypoint(TileIndex tile)
 	}
 }
 
-void CcStation(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcStation(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Failed()) return;
 
@@ -273,7 +273,7 @@ static void PlaceRail_Bridge(TileIndex tile, Window *w)
 }
 
 /** Command callback for building a tunnel */
-void CcBuildRailTunnel(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcBuildRailTunnel(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
@@ -502,7 +502,7 @@ struct BuildRailToolbarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget < WID_RAT_BUILD_NS) return;
 
@@ -599,7 +599,7 @@ struct BuildRailToolbarWindow : Window {
 		return Window::OnHotkey(hotkey);
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (this->last_user_action) {
 			case WID_RAT_BUILD_NS:
@@ -658,7 +658,7 @@ struct BuildRailToolbarWindow : Window {
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		/* no dragging if you have pressed the convert button */
 		if (FindWindowById(WC_BUILD_SIGNAL, 0) != nullptr && _convert_signal_button && this->IsWidgetLowered(WID_RAT_BUILD_SIGNALS)) return;
@@ -666,7 +666,7 @@ struct BuildRailToolbarWindow : Window {
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1) {
 			switch (select_proc) {
@@ -746,7 +746,7 @@ struct BuildRailToolbarWindow : Window {
 		CloseWindowByClass(WC_BUILD_BRIDGE);
 	}
 
-	void OnPlacePresize(Point pt, TileIndex tile) override
+	void OnPlacePresize([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		Command<CMD_BUILD_TUNNEL>::Do(DC_AUTO, tile, TRANSPORT_RAIL, _cur_railtype);
 		VpSetPresizeRange(tile, _build_tunnel_endtile == 0 ? tile : _build_tunnel_endtile);
@@ -759,7 +759,7 @@ struct BuildRailToolbarWindow : Window {
 		return ES_NOT_HANDLED;
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		if (this->IsWidgetLowered(WID_RAT_BUILD_WAYPOINT)) CheckRedrawWaypointCoverage(this);
 	}
@@ -1105,7 +1105,7 @@ public:
 		_railstation.station_class = station_class;
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -1183,7 +1183,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BRAS_NEWST_LIST: {
@@ -1320,7 +1320,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (GB(widget, 0, 16)) {
 			case WID_BRAS_PLATFORM_DIR_X:
@@ -1487,7 +1487,7 @@ public:
 		}
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		CheckRedrawStationCoverage(this);
 	}
@@ -1718,7 +1718,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_BS_DRAG_SIGNALS_DENSITY_LABEL) {
 			/* Two digits for signals density. */
@@ -1752,7 +1752,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BS_SEMAPHORE_NORM:
@@ -1818,7 +1818,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->LowerWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);
@@ -1907,7 +1907,7 @@ struct BuildRailDepotWindow : public PickerWindowBase {
 		this->LowerWidget(_build_depot_direction + WID_BRAD_DEPOT_NE);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (!IsInsideMM(widget, WID_BRAD_DEPOT_NE, WID_BRAD_DEPOT_NW + 1)) return;
 
@@ -1928,7 +1928,7 @@ struct BuildRailDepotWindow : public PickerWindowBase {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BRAD_DEPOT_NE:
@@ -2072,7 +2072,7 @@ struct BuildRailWaypointWindow : PickerWindowBase {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BRW_WAYPOINT_MATRIX:
@@ -2135,7 +2135,7 @@ struct BuildRailWaypointWindow : PickerWindowBase {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (GB(widget, 0, 16)) {
 			case WID_BRW_WAYPOINT: {
@@ -2156,7 +2156,7 @@ struct BuildRailWaypointWindow : PickerWindowBase {
 		}
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->list.ForceRebuild();
@@ -2170,7 +2170,7 @@ struct BuildRailWaypointWindow : PickerWindowBase {
 		}
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		CheckRedrawWaypointCoverage(this);
 	}
@@ -2291,9 +2291,8 @@ static void SetDefaultRailGui()
 /**
  * Updates the current signal variant used in the signal GUI
  * to the one adequate to current year.
- * @param new_value needed to be called when a setting changes
  */
-void ResetSignalVariant(int32_t new_value)
+void ResetSignalVariant(int32_t)
 {
 	SignalVariant new_variant = (TimerGameCalendar::year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC);
 
diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
index 2e16f25a92..29791c6c24 100644
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -1905,7 +1905,7 @@ void UpdateNearestTownForRoadTiles(bool invalidate)
 	}
 }
 
-static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Road(TileIndex tile, uint x, uint y, bool)
 {
 
 	if (IsNormalRoad(tile)) {
@@ -2222,7 +2222,7 @@ static const byte _roadveh_enter_depot_dir[4] = {
 	TRACKDIR_X_SW, TRACKDIR_Y_NW, TRACKDIR_X_NE, TRACKDIR_Y_SE
 };
 
-static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int x, int y)
+static VehicleEnterTileStatus VehicleEnter_Road(Vehicle *v, TileIndex tile, int, int)
 {
 	switch (GetRoadTileType(tile)) {
 		case ROAD_TILE_DEPOT: {
diff --git a/src/road_gui.cpp b/src/road_gui.cpp
index 2d7cfa763a..b67f5750af 100644
--- a/src/road_gui.cpp
+++ b/src/road_gui.cpp
@@ -98,7 +98,7 @@ static bool IsRoadStopAvailable(const RoadStopSpec *roadstopspec, StationType ty
 	return Convert8bitBooleanCallback(roadstopspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res);
 }
 
-void CcPlaySound_CONSTRUCTION_OTHER(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcPlaySound_CONSTRUCTION_OTHER(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
 }
@@ -121,11 +121,10 @@ static void PlaceRoad_Bridge(TileIndex tile, Window *w)
 /**
  * Callback executed after a build road tunnel command has been called.
  *
- * @param cmd unused
  * @param result Whether the build succeeded.
  * @param start_tile Starting tile of the tunnel.
  */
-void CcBuildRoadTunnel(Commands cmd, const CommandCost &result, TileIndex start_tile)
+void CcBuildRoadTunnel(Commands, const CommandCost &result, TileIndex start_tile)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, start_tile);
@@ -158,7 +157,7 @@ void ConnectRoadToStructure(TileIndex tile, DiagDirection direction)
 	}
 }
 
-void CcRoadDepot(Commands cmd, const CommandCost &result, TileIndex tile, RoadType rt, DiagDirection dir)
+void CcRoadDepot(Commands, const CommandCost &result, TileIndex tile, RoadType, DiagDirection dir)
 {
 	if (result.Failed()) return;
 
@@ -169,7 +168,6 @@ void CcRoadDepot(Commands cmd, const CommandCost &result, TileIndex tile, RoadTy
 
 /**
  * Command callback for building road stops.
- * @param cmd Unused.
  * @param result Result of the build road stop command.
  * @param tile Start tile.
  * @param width Width of the road stop.
@@ -180,7 +178,7 @@ void CcRoadDepot(Commands cmd, const CommandCost &result, TileIndex tile, RoadTy
  * @param spec_index Road stop spec index.
  * @see CmdBuildRoadStop
  */
-void CcRoadStop(Commands cmd, const CommandCost &result, TileIndex tile, uint8_t width, uint8_t length, RoadStopType, bool is_drive_through,
+void CcRoadStop(Commands, const CommandCost &result, TileIndex tile, uint8_t width, uint8_t length, RoadStopType, bool is_drive_through,
 		DiagDirection dir, RoadType, RoadStopClassID spec_class, uint16_t spec_index, StationID, bool)
 {
 	if (result.Failed()) return;
@@ -341,7 +339,7 @@ struct BuildRoadToolbarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		RoadTramType rtt = GetRoadTramType(this->roadtype);
@@ -472,7 +470,7 @@ struct BuildRoadToolbarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		_remove_button_clicked = false;
 		_one_way_button_clicked = false;
@@ -560,7 +558,7 @@ struct BuildRoadToolbarWindow : Window {
 		return Window::OnHotkey(hotkey);
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		_remove_button_clicked = this->IsWidgetLowered(WID_ROT_REMOVE);
 		_one_way_button_clicked = RoadTypeIsRoad(this->roadtype) ? this->IsWidgetLowered(WID_ROT_ONE_WAY) : false;
@@ -638,7 +636,7 @@ struct BuildRoadToolbarWindow : Window {
 		CloseWindowByClass(WC_BUILD_BRIDGE);
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		/* Here we update the end tile flags
 		 * of the road placement actions.
@@ -677,7 +675,7 @@ struct BuildRoadToolbarWindow : Window {
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1) {
 			switch (select_proc) {
@@ -737,7 +735,7 @@ struct BuildRoadToolbarWindow : Window {
 		}
 	}
 
-	void OnPlacePresize(Point pt, TileIndex tile) override
+	void OnPlacePresize([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		Command<CMD_BUILD_TUNNEL>::Do(DC_AUTO, tile, TRANSPORT_ROAD, _cur_roadtype);
 		VpSetPresizeRange(tile, _build_tunnel_endtile == 0 ? tile : _build_tunnel_endtile);
@@ -1018,7 +1016,7 @@ struct BuildRoadDepotWindow : public PickerWindowBase {
 		this->FinishInitNested(TRANSPORT_ROAD);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (!IsInsideMM(widget, WID_BROD_DEPOT_NE, WID_BROD_DEPOT_NW + 1)) return;
 
@@ -1039,7 +1037,7 @@ struct BuildRoadDepotWindow : public PickerWindowBase {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BROD_DEPOT_NW:
@@ -1290,7 +1288,7 @@ public:
 		}
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -1344,7 +1342,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_BROS_NEWST_LIST: {
@@ -1492,7 +1490,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (GB(widget, 0, 16)) {
 			case WID_BROS_STATION_NE:
@@ -1570,7 +1568,7 @@ public:
 		}
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		CheckRedrawStationCoverage(this);
 	}
diff --git a/src/roadveh.h b/src/roadveh.h
index d721170629..90b02ba878 100644
--- a/src/roadveh.h
+++ b/src/roadveh.h
@@ -166,7 +166,7 @@ protected: // These functions should not be called outside acceleration code.
 	 * Returns a value if this articulated part is powered.
 	 * @return Zero, because road vehicles don't have powered parts.
 	 */
-	inline uint16_t GetPoweredPartPower(const RoadVehicle *head) const
+	inline uint16_t GetPoweredPartPower(const RoadVehicle *) const
 	{
 		return 0;
 	}
diff --git a/src/saveload/game_sl.cpp b/src/saveload/game_sl.cpp
index 8aa4805576..bcf3189b82 100644
--- a/src/saveload/game_sl.cpp
+++ b/src/saveload/game_sl.cpp
@@ -34,7 +34,7 @@ static const SaveLoad _game_script_desc[] = {
 	    SLEG_VAR("is_random", _game_saveload_is_random,   SLE_BOOL),
 };
 
-static void SaveReal_GSDT(int *index_ptr)
+static void SaveReal_GSDT(int *)
 {
 	GameConfig *config = GameConfig::GetConfig();
 
diff --git a/src/saveload/oldloader_sl.cpp b/src/saveload/oldloader_sl.cpp
index cb1e261eeb..54c4f51090 100644
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -638,7 +638,7 @@ static bool LoadOldOrder(LoadgameState *ls, int num)
 	return true;
 }
 
-static bool LoadOldAnimTileList(LoadgameState *ls, int num)
+static bool LoadOldAnimTileList(LoadgameState *ls, int)
 {
 	TileIndex anim_list[256];
 	const OldChunks anim_chunk[] = {
@@ -894,7 +894,7 @@ static const OldChunks _company_economy_chunk[] = {
 	OCL_END()
 };
 
-static bool LoadOldCompanyEconomy(LoadgameState *ls, int num)
+static bool LoadOldCompanyEconomy(LoadgameState *ls, int)
 {
 	Company *c = Company::Get(_current_company_id);
 
@@ -1097,7 +1097,7 @@ static const OldChunks vehicle_empty_chunk[] = {
 	OCL_END()
 };
 
-static bool LoadOldVehicleUnion(LoadgameState *ls, int num)
+static bool LoadOldVehicleUnion(LoadgameState *ls, int)
 {
 	Vehicle *v = Vehicle::GetIfValid(_current_vehicle_id);
 	uint temp = ls->total_read;
@@ -1464,7 +1464,7 @@ static const OldChunks game_difficulty_chunk[] = {
 	OCL_END()
 };
 
-static bool LoadOldGameDifficulty(LoadgameState *ls, int num)
+static bool LoadOldGameDifficulty(LoadgameState *ls, int)
 {
 	bool ret = LoadChunk(ls, &_settings_game.difficulty, game_difficulty_chunk);
 	_settings_game.difficulty.max_loan *= 1000;
@@ -1472,7 +1472,7 @@ static bool LoadOldGameDifficulty(LoadgameState *ls, int num)
 }
 
 
-static bool LoadOldMapPart1(LoadgameState *ls, int num)
+static bool LoadOldMapPart1(LoadgameState *ls, int)
 {
 	if (_savegame_type == SGT_TTO) {
 		Map::Allocate(OLD_MAP_SIZE, OLD_MAP_SIZE);
@@ -1502,7 +1502,7 @@ static bool LoadOldMapPart1(LoadgameState *ls, int num)
 	return true;
 }
 
-static bool LoadOldMapPart2(LoadgameState *ls, int num)
+static bool LoadOldMapPart2(LoadgameState *ls, int)
 {
 	uint i;
 
@@ -1516,7 +1516,7 @@ static bool LoadOldMapPart2(LoadgameState *ls, int num)
 	return true;
 }
 
-static bool LoadTTDPatchExtraChunks(LoadgameState *ls, int num)
+static bool LoadTTDPatchExtraChunks(LoadgameState *ls, int)
 {
 	ReadTTDPatchFlags();
 
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index cb2fccc065..124ae8239a 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -1711,7 +1711,7 @@ void SlObject(void *object, const SaveLoadTable &slt)
  * is not known to the code. This means we are going to skip it.
  */
 class SlSkipHandler : public SaveLoadHandler {
-	void Save(void *object) const override
+	void Save(void *) const override
 	{
 		NOT_REACHED();
 	}
@@ -2339,9 +2339,8 @@ struct LZOSaveFilter : SaveFilter {
 	/**
 	 * Initialise this filter.
 	 * @param chain             The next filter in this chain.
-	 * @param compression_level The requested level of compression.
 	 */
-	LZOSaveFilter(SaveFilter *chain, byte compression_level) : SaveFilter(chain)
+	LZOSaveFilter(SaveFilter *chain, byte) : SaveFilter(chain)
 	{
 		if (lzo_init() != LZO_E_OK) SlError(STR_GAME_SAVELOAD_ERROR_BROKEN_INTERNAL_ERROR, "cannot initialize compressor");
 	}
@@ -2396,9 +2395,8 @@ struct NoCompSaveFilter : SaveFilter {
 	/**
 	 * Initialise this filter.
 	 * @param chain             The next filter in this chain.
-	 * @param compression_level The requested level of compression.
 	 */
-	NoCompSaveFilter(SaveFilter *chain, byte compression_level) : SaveFilter(chain)
+	NoCompSaveFilter(SaveFilter *chain, byte) : SaveFilter(chain)
 	{
 	}
 
diff --git a/src/saveload/saveload.h b/src/saveload/saveload.h
index df02b235f4..3e4953a061 100644
--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -493,25 +493,25 @@ public:
 	 * Save the object to disk.
 	 * @param object The object to store.
 	 */
-	virtual void Save(void *object) const {}
+	virtual void Save([[maybe_unused]] void *object) const {}
 
 	/**
 	 * Load the object from disk.
 	 * @param object The object to load.
 	 */
-	virtual void Load(void *object) const {}
+	virtual void Load([[maybe_unused]] void *object) const {}
 
 	/**
 	 * Similar to load, but used only to validate savegames.
 	 * @param object The object to load.
 	 */
-	virtual void LoadCheck(void *object) const {}
+	virtual void LoadCheck([[maybe_unused]] void *object) const {}
 
 	/**
 	 * A post-load callback to fix #SL_REF integers into pointers.
 	 * @param object The object to fix.
 	 */
-	virtual void FixPointers(void *object) const {}
+	virtual void FixPointers([[maybe_unused]] void *object) const {}
 
 	/**
 	 * Get the description of the fields in the savegame.
@@ -548,16 +548,16 @@ public:
 	SaveLoadTable GetDescription() const override { return static_cast<const TImpl *>(this)->description; }
 	SaveLoadCompatTable GetCompatDescription() const override { return static_cast<const TImpl *>(this)->compat_description; }
 
-	virtual void Save(TObject *object) const {}
+	virtual void Save([[maybe_unused]] TObject *object) const {}
 	void Save(void *object) const override { this->Save(static_cast<TObject *>(object)); }
 
-	virtual void Load(TObject *object) const {}
+	virtual void Load([[maybe_unused]] TObject *object) const {}
 	void Load(void *object) const override { this->Load(static_cast<TObject *>(object)); }
 
-	virtual void LoadCheck(TObject *object) const {}
+	virtual void LoadCheck([[maybe_unused]] TObject *object) const {}
 	void LoadCheck(void *object) const override { this->LoadCheck(static_cast<TObject *>(object)); }
 
-	virtual void FixPointers(TObject *object) const {}
+	virtual void FixPointers([[maybe_unused]] TObject *object) const {}
 	void FixPointers(void *object) const override { this->FixPointers(static_cast<TObject *>(object)); }
 };
 
diff --git a/src/saveload/town_sl.cpp b/src/saveload/town_sl.cpp
index 695a51b0c0..82b2d85151 100644
--- a/src/saveload/town_sl.cpp
+++ b/src/saveload/town_sl.cpp
@@ -190,7 +190,7 @@ public:
 	};
 	inline const static SaveLoadCompatTable compat_description = _town_acceptance_matrix_sl_compat;
 
-	void Load(Town *t) const override
+	void Load(Town *) const override
 	{
 		/* Discard now unused acceptance matrix. */
 		AcceptanceMatrix dummy;
diff --git a/src/screenshot.cpp b/src/screenshot.cpp
index 386b5e4a27..5b9ce9388b 100644
--- a/src/screenshot.cpp
+++ b/src/screenshot.cpp
@@ -599,7 +599,7 @@ void InitializeScreenshotFormats()
  * Callback of the screenshot generator that dumps the current video buffer.
  * @see ScreenshotCallback
  */
-static void CurrentScreenCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
+static void CurrentScreenCallback(void *, void *buf, uint y, uint pitch, uint n)
 {
 	Blitter *blitter = BlitterFactory::GetCurrentBlitter();
 	void *src = blitter->MoveTo(_screen.dst_ptr, 0, y);
@@ -811,14 +811,12 @@ static bool MakeLargeWorldScreenshot(ScreenshotType t, uint32_t width = 0, uint3
 
 /**
  * Callback for generating a heightmap. Supports 8bpp grayscale only.
- * @param userdata Pointer to user data.
  * @param buffer   Destination buffer.
  * @param y        Line number of the first line to write.
- * @param pitch    Number of pixels to write (1 byte for 8bpp, 4 bytes for 32bpp). @see Colour
  * @param n        Number of lines to write.
  * @see ScreenshotCallback
  */
-static void HeightmapCallback(void *userdata, void *buffer, uint y, uint pitch, uint n)
+static void HeightmapCallback(void *, void *buffer, uint y, uint, uint n)
 {
 	byte *buf = (byte *)buffer;
 	while (n > 0) {
@@ -862,10 +860,9 @@ static ScreenshotType _confirmed_screenshot_type; ///< Screenshot type the curre
 
 /**
  * Callback on the confirmation window for huge screenshots.
- * @param w Window with viewport
  * @param confirmed true on confirmation
  */
-static void ScreenshotConfirmationCallback(Window *w, bool confirmed)
+static void ScreenshotConfirmationCallback(Window *, bool confirmed)
 {
 	if (confirmed) MakeScreenshot(_confirmed_screenshot_type, {});
 }
@@ -996,7 +993,7 @@ bool MakeScreenshot(ScreenshotType t, std::string name, uint32_t width, uint32_t
 }
 
 
-static void MinimapScreenCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
+static void MinimapScreenCallback(void *, void *buf, uint y, uint pitch, uint n)
 {
 	uint32_t *ubuf = (uint32_t *)buf;
 	uint num = (pitch * n);
diff --git a/src/screenshot_gui.cpp b/src/screenshot_gui.cpp
index 2ace881092..060eb4933e 100644
--- a/src/screenshot_gui.cpp
+++ b/src/screenshot_gui.cpp
@@ -27,7 +27,7 @@ struct ScreenshotWindow : Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget < 0) return;
 		ScreenshotType st;
diff --git a/src/script/api/script_base.cpp b/src/script/api/script_base.cpp
index ab5dd848bc..18c3519b65 100644
--- a/src/script/api/script_base.cpp
+++ b/src/script/api/script_base.cpp
@@ -18,7 +18,7 @@
 	return ScriptObject::GetRandomizer().Next();
 }
 
-/* static */ SQInteger ScriptBase::RandItem(SQInteger unused_param)
+/* static */ SQInteger ScriptBase::RandItem(SQInteger)
 {
 	return ScriptBase::Rand();
 }
@@ -29,7 +29,7 @@
 	return ScriptObject::GetRandomizer().Next(max);
 }
 
-/* static */ SQInteger ScriptBase::RandRangeItem(SQInteger unused_param, SQInteger max)
+/* static */ SQInteger ScriptBase::RandRangeItem(SQInteger, SQInteger max)
 {
 	return ScriptBase::RandRange(max);
 }
@@ -42,7 +42,7 @@
 	return ScriptBase::RandRange(max) < out;
 }
 
-/* static */ bool ScriptBase::ChanceItem(SQInteger unused_param, SQInteger out, SQInteger max)
+/* static */ bool ScriptBase::ChanceItem(SQInteger, SQInteger out, SQInteger max)
 {
 	return ScriptBase::Chance(out, max);
 }
diff --git a/src/script/script_gui.cpp b/src/script/script_gui.cpp
index c528734191..5ffcdf699c 100644
--- a/src/script/script_gui.cpp
+++ b/src/script/script_gui.cpp
@@ -102,7 +102,7 @@ struct ScriptListWindow : public Window {
 		SetDParam(0, (this->slot == OWNER_DEITY) ? STR_AI_LIST_CAPTION_GAMESCRIPT : STR_AI_LIST_CAPTION_AI);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_SCRL_LIST) return;
 
@@ -184,7 +184,7 @@ struct ScriptListWindow : public Window {
 		InvalidateWindowClassesData(WC_TEXTFILE);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SCRL_LIST: { // Select one of the Scripts
@@ -222,7 +222,7 @@ struct ScriptListWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (_game_mode == GM_NORMAL && Company::IsValidID(this->slot)) {
 			this->Close();
@@ -342,7 +342,7 @@ struct ScriptSettingsWindow : public Window {
 		SetDParam(0, (this->slot == OWNER_DEITY) ? STR_AI_SETTINGS_CAPTION_GAMESCRIPT : STR_AI_SETTINGS_CAPTION_AI);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_SCRS_BACKGROUND) return;
 
@@ -421,7 +421,7 @@ struct ScriptSettingsWindow : public Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SCRS_BACKGROUND: {
@@ -530,7 +530,7 @@ struct ScriptSettingsWindow : public Window {
 		SetValue(index);
 	}
 
-	void OnDropdownClose(Point pt, int widget, int index, bool instant_close) override
+	void OnDropdownClose(Point, int widget, int, bool) override
 	{
 		/* We cannot raise the dropdown button just yet. OnClick needs some hint, whether
 		 * the same dropdown button was clicked again, and then not open the dropdown again.
@@ -557,7 +557,7 @@ struct ScriptSettingsWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		this->RebuildVisibleSettings();
 		this->CloseChildWindows(WC_DROPDOWN_MENU);
@@ -640,7 +640,7 @@ struct ScriptTextfileWindow : public TextfileWindow {
 		}
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		auto textfile = GetConfig(slot)->GetTextfile(file_type, slot);
 		if (!textfile.has_value()) {
@@ -788,7 +788,7 @@ struct ScriptDebugWindow : public Window {
 		this->InvalidateData(-1);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget == WID_SCRD_LOG_PANEL) {
 			resize->height = FONT_HEIGHT_NORMAL + WidgetDimensions::scaled.vsep_normal;
@@ -948,7 +948,7 @@ struct ScriptDebugWindow : public Window {
 		this->last_vscroll_pos = this->vscroll->GetPosition();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		/* Also called for hotkeys, so check for disabledness */
 		if (this->IsWidgetDisabled(widget)) return;
@@ -1032,7 +1032,7 @@ struct ScriptDebugWindow : public Window {
 	 *             This is the company ID of the AI/GS which wrote a new log message, or -1 in other cases.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		/* If the log message is related to the active company tab, check the break string.
 		 * This needs to be done in gameloop-scope, so the AI is suspended immediately. */
diff --git a/src/script/script_scanner.cpp b/src/script/script_scanner.cpp
index 52625c6515..ff85007ce9 100644
--- a/src/script/script_scanner.cpp
+++ b/src/script/script_scanner.cpp
@@ -23,7 +23,7 @@
 
 #include "../safeguards.h"
 
-bool ScriptScanner::AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+bool ScriptScanner::AddFile(const std::string &filename, size_t, const std::string &tar_filename)
 {
 	this->main_script = filename;
 	this->tar_file = tar_filename;
@@ -161,7 +161,7 @@ struct ScriptFileChecksumCreator : FileScanner {
 	ScriptFileChecksumCreator(Subdirectory dir) : dir(dir) {}
 
 	/* Add the file and calculate the md5 sum. */
-	virtual bool AddFile(const std::string &filename, size_t basepath_length, const std::string &tar_filename)
+	bool AddFile(const std::string &filename, size_t, const std::string &) override
 	{
 		Md5 checksum;
 		uint8_t buffer[1024];
diff --git a/src/script/squirrel_helper.hpp b/src/script/squirrel_helper.hpp
index 4bcccbf60a..ba22fc881a 100644
--- a/src/script/squirrel_helper.hpp
+++ b/src/script/squirrel_helper.hpp
@@ -131,7 +131,7 @@ namespace SQConvert {
 
 	private:
 		template <size_t... i>
-		static int SQCall(void *instance, Tretval(*func)(Targs...), [[maybe_unused]] HSQUIRRELVM vm, std::index_sequence<i...>)
+		static int SQCall(void *, Tretval(*func)(Targs...), [[maybe_unused]] HSQUIRRELVM vm, std::index_sequence<i...>)
 		{
 			if constexpr (std::is_void_v<Tretval>) {
 				(*func)(
@@ -180,7 +180,7 @@ namespace SQConvert {
 		}
 
 		template <size_t... i>
-		static Tcls *SQConstruct(Tcls *, Tretval(Tcls:: *func)(Targs...), [[maybe_unused]] HSQUIRRELVM vm, std::index_sequence<i...>)
+		static Tcls *SQConstruct(Tcls *, Tretval(Tcls:: *)(Targs...), [[maybe_unused]] HSQUIRRELVM vm, std::index_sequence<i...>)
 		{
 			Tcls *inst = new Tcls(
 				Param<Targs>::Get(vm, 2 + i)...
@@ -321,7 +321,7 @@ namespace SQConvert {
 	 *  here as it has to be in the same scope as DefSQConstructorCallback.
 	 */
 	template <typename Tcls>
-	static SQInteger DefSQDestructorCallback(SQUserPointer p, SQInteger size)
+	static SQInteger DefSQDestructorCallback(SQUserPointer p, SQInteger)
 	{
 		/* Remove the real instance too */
 		if (p != nullptr) ((Tcls *)p)->Release();
diff --git a/src/settings.cpp b/src/settings.cpp
index 42c2fe0d2d..a7a4d1a7c0 100644
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -754,13 +754,13 @@ bool StringSettingDesc::IsDefaultValue(void *object) const
 	return this->def == str;
 }
 
-bool ListSettingDesc::IsSameValue(const IniItem *item, void *object) const
+bool ListSettingDesc::IsSameValue(const IniItem *, void *) const
 {
 	/* Checking for equality is way more expensive than just writing the value. */
 	return false;
 }
 
-bool ListSettingDesc::IsDefaultValue(void *object) const
+bool ListSettingDesc::IsDefaultValue(void *) const
 {
 	/* Defaults of lists are often complicated, and hard to compare. */
 	return false;
diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index 319e2faf9b..e6fba68826 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -432,7 +432,7 @@ struct GameOptionsWindow : Window {
 		if (changed) this->ReInit(0, 0, this->flags & WF_CENTERED);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_GO_BASE_GRF_STATUS:
@@ -483,7 +483,7 @@ struct GameOptionsWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_GO_BASE_GRF_TEXTFILE && widget < WID_GO_BASE_GRF_TEXTFILE + TFT_CONTENT_END) {
 			if (BaseGraphics::GetUsedSet() == nullptr) return;
@@ -728,7 +728,7 @@ struct GameOptionsWindow : Window {
 	 * @param data Information about the changed data. @see GameOptionsInvalidationData
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->SetWidgetLoweredState(WID_GO_SURVEY_PARTICIPATE_BUTTON, _settings_client.network.participate_survey == PS_YES);
@@ -990,10 +990,10 @@ struct BaseSettingEntry {
 	void SetLastField(bool last_field) { if (last_field) SETBITS(this->flags, SEF_LAST_FIELD); else CLRBITS(this->flags, SEF_LAST_FIELD); }
 
 	virtual uint Length() const = 0;
-	virtual void GetFoldingState(bool &all_folded, bool &all_unfolded) const {}
+	virtual void GetFoldingState([[maybe_unused]] bool &all_folded, [[maybe_unused]] bool &all_unfolded) const {}
 	virtual bool IsVisible(const BaseSettingEntry *item) const;
 	virtual BaseSettingEntry *FindEntry(uint row, uint *cur_row);
-	virtual uint GetMaxHelpHeight(int maxw) { return 0; }
+	virtual uint GetMaxHelpHeight([[maybe_unused]] int maxw) { return 0; }
 
 	/**
 	 * Check whether an entry is hidden due to filters
@@ -1714,13 +1714,11 @@ uint SettingsPage::Draw(GameSettings *settings_ptr, int left, int right, int y,
 
 /**
  * Function to draw setting value (button + text + current value)
- * @param settings_ptr Pointer to current values of all settings
  * @param left         Left-most position in window/panel to start drawing
  * @param right        Right-most position in window/panel to draw
  * @param y            Upper-most position in window/panel to start drawing
- * @param highlight    Highlight entry.
  */
-void SettingsPage::DrawSetting(GameSettings *settings_ptr, int left, int right, int y, bool highlight) const
+void SettingsPage::DrawSetting(GameSettings *, int left, int right, int y, bool) const
 {
 	bool rtl = _current_text_dir == TD_RTL;
 	DrawSprite((this->folded ? SPR_CIRCLE_FOLDED : SPR_CIRCLE_UNFOLDED), PAL_NONE, rtl ? right - _circle_size.width : left, y + (SETTING_HEIGHT - _circle_size.height) / 2);
@@ -2125,7 +2123,7 @@ struct GameSettingsWindow : Window {
 		_circle_size = maxdim(GetSpriteSize(SPR_CIRCLE_FOLDED), GetSpriteSize(SPR_CIRCLE_UNFOLDED));
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_GS_OPTIONSPANEL:
@@ -2285,7 +2283,7 @@ struct GameSettingsWindow : Window {
 		this->last_clicked = pe;
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_GS_EXPAND_ALL:
@@ -2561,7 +2559,7 @@ struct GameSettingsWindow : Window {
 		}
 	}
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -2772,7 +2770,7 @@ struct CustomCurrencyWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			/* Set the appropriate width for the edit 'buttons' */
@@ -2791,7 +2789,7 @@ struct CustomCurrencyWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		int line = 0;
 		int len = 0;
diff --git a/src/settings_internal.h b/src/settings_internal.h
index 9c791cb0c5..7980ebae03 100644
--- a/src/settings_internal.h
+++ b/src/settings_internal.h
@@ -342,10 +342,10 @@ struct NullSettingDesc : SettingDesc {
 	NullSettingDesc(const SaveLoad &save) :
 		SettingDesc(save, SF_NOT_IN_CONFIG, false) {}
 
-	std::string FormatValue(const void *object) const override { NOT_REACHED(); }
-	void ParseValue(const IniItem *item, void *object) const override { NOT_REACHED(); }
-	bool IsSameValue(const IniItem *item, void *object) const override { NOT_REACHED(); }
-	bool IsDefaultValue(void *object) const override { NOT_REACHED(); }
+	std::string FormatValue(const void *) const override { NOT_REACHED(); }
+	void ParseValue(const IniItem *, void *) const override { NOT_REACHED(); }
+	bool IsSameValue(const IniItem *, void *) const override { NOT_REACHED(); }
+	bool IsDefaultValue(void *) const override { NOT_REACHED(); }
 };
 
 typedef std::variant<IntSettingDesc, BoolSettingDesc, OneOfManySettingDesc, ManyOfManySettingDesc, StringSettingDesc, ListSettingDesc, NullSettingDesc> SettingVariant;
diff --git a/src/settings_table.cpp b/src/settings_table.cpp
index 29fe6c09e2..44d8189ca1 100644
--- a/src/settings_table.cpp
+++ b/src/settings_table.cpp
@@ -79,13 +79,13 @@ SettingTable _win32_settings{ _win32_settings_table };
 /* Begin - Callback Functions for the various settings. */
 
 /** Reposition the main toolbar as the setting changed. */
-static void v_PositionMainToolbar(int32_t new_value)
+static void v_PositionMainToolbar(int32_t)
 {
 	if (_game_mode != GM_MENU) PositionMainToolbar(nullptr);
 }
 
 /** Reposition the statusbar as the setting changed. */
-static void v_PositionStatusbar(int32_t new_value)
+static void v_PositionStatusbar(int32_t)
 {
 	if (_game_mode != GM_MENU) {
 		PositionStatusbar(nullptr);
@@ -96,9 +96,8 @@ static void v_PositionStatusbar(int32_t new_value)
 
 /**
  * Redraw the smallmap after a colour scheme change.
- * @param new_value Callback parameter.
  */
-static void RedrawSmallmap(int32_t new_value)
+static void RedrawSmallmap(int32_t)
 {
 	BuildLandLegend();
 	BuildOwnerLegend();
@@ -106,19 +105,19 @@ static void RedrawSmallmap(int32_t new_value)
 }
 
 /** Redraw linkgraph links after a colour scheme change. */
-static void UpdateLinkgraphColours(int32_t new_value)
+static void UpdateLinkgraphColours(int32_t)
 {
 	BuildLinkStatsLegend();
 	MarkWholeScreenDirty();
 }
 
-static void StationSpreadChanged(int32_t new_value)
+static void StationSpreadChanged(int32_t)
 {
 	InvalidateWindowData(WC_SELECT_STATION, 0);
 	InvalidateWindowData(WC_BUILD_STATION, 0);
 }
 
-static void UpdateConsists(int32_t new_value)
+static void UpdateConsists(int32_t)
 {
 	for (Train *t : Train::Iterate()) {
 		/* Update the consist of all trains so the maximum speed is set correctly. */
@@ -170,7 +169,7 @@ static void UpdateAllServiceInterval(int32_t new_value)
 	SetWindowClassesDirty(WC_VEHICLE_DETAILS);
 }
 
-static bool CanUpdateServiceInterval(VehicleType type, int32_t &new_value)
+static bool CanUpdateServiceInterval(VehicleType, int32_t &new_value)
 {
 	VehicleDefaultSettings *vds;
 	if (_game_mode == GM_MENU || !Company::IsValidID(_current_company)) {
@@ -197,7 +196,7 @@ static void UpdateServiceInterval(VehicleType type, int32_t new_value)
 	SetWindowClassesDirty(WC_VEHICLE_DETAILS);
 }
 
-static void TrainAccelerationModelChanged(int32_t new_value)
+static void TrainAccelerationModelChanged(int32_t)
 {
 	for (Train *t : Train::Iterate()) {
 		if (t->IsFrontEngine()) {
@@ -214,9 +213,8 @@ static void TrainAccelerationModelChanged(int32_t new_value)
 
 /**
  * This function updates the train acceleration cache after a steepness change.
- * @param new_value Unused new value of setting.
  */
-static void TrainSlopeSteepnessChanged(int32_t new_value)
+static void TrainSlopeSteepnessChanged(int32_t)
 {
 	for (Train *t : Train::Iterate()) {
 		if (t->IsFrontEngine()) t->CargoChanged();
@@ -225,9 +223,8 @@ static void TrainSlopeSteepnessChanged(int32_t new_value)
 
 /**
  * This function updates realistic acceleration caches when the setting "Road vehicle acceleration model" is set.
- * @param new_value Unused new value of setting.
  */
-static void RoadVehAccelerationModelChanged(int32_t new_value)
+static void RoadVehAccelerationModelChanged(int32_t)
 {
 	if (_settings_game.vehicle.roadveh_acceleration_model != AM_ORIGINAL) {
 		for (RoadVehicle *rv : RoadVehicle::Iterate()) {
@@ -245,16 +242,15 @@ static void RoadVehAccelerationModelChanged(int32_t new_value)
 
 /**
  * This function updates the road vehicle acceleration cache after a steepness change.
- * @param new_value Unused new value of setting.
  */
-static void RoadVehSlopeSteepnessChanged(int32_t new_value)
+static void RoadVehSlopeSteepnessChanged(int32_t)
 {
 	for (RoadVehicle *rv : RoadVehicle::Iterate()) {
 		if (rv->IsFrontEngine()) rv->CargoChanged();
 	}
 }
 
-static void TownFoundingChanged(int32_t new_value)
+static void TownFoundingChanged(int32_t)
 {
 	if (_game_mode != GM_EDITOR && _settings_game.economy.found_town == TF_FORBIDDEN) {
 		CloseWindowById(WC_FOUND_TOWN, 0);
@@ -263,7 +259,7 @@ static void TownFoundingChanged(int32_t new_value)
 	}
 }
 
-static void ZoomMinMaxChanged(int32_t new_value)
+static void ZoomMinMaxChanged(int32_t)
 {
 	ConstrainAllViewportsZoom();
 	GfxClearSpriteCache();
@@ -275,7 +271,7 @@ static void ZoomMinMaxChanged(int32_t new_value)
 	}
 }
 
-static void SpriteZoomMinChanged(int32_t new_value)
+static void SpriteZoomMinChanged(int32_t)
 {
 	GfxClearSpriteCache();
 	/* Force all sprites to redraw at the new chosen zoom level */
@@ -286,22 +282,21 @@ static void SpriteZoomMinChanged(int32_t new_value)
  * Update any possible saveload window and delete any newgrf dialogue as
  * its widget parts might change. Reinit all windows as it allows access to the
  * newgrf debug button.
- * @param new_value unused.
  */
-static void InvalidateNewGRFChangeWindows(int32_t new_value)
+static void InvalidateNewGRFChangeWindows(int32_t)
 {
 	InvalidateWindowClassesData(WC_SAVELOAD);
 	CloseWindowByClass(WC_GAME_OPTIONS);
 	ReInitAllWindows(false);
 }
 
-static void InvalidateCompanyLiveryWindow(int32_t new_value)
+static void InvalidateCompanyLiveryWindow(int32_t)
 {
 	InvalidateWindowClassesData(WC_COMPANY_COLOUR, -1);
 	ResetVehicleColourMap();
 }
 
-static void DifficultyNoiseChange(int32_t new_value)
+static void DifficultyNoiseChange(int32_t)
 {
 	if (_game_mode == GM_NORMAL) {
 		UpdateAirportsNoise();
@@ -311,7 +306,7 @@ static void DifficultyNoiseChange(int32_t new_value)
 	}
 }
 
-static void MaxNoAIsChange(int32_t new_value)
+static void MaxNoAIsChange(int32_t)
 {
 	if (GetGameSettings().difficulty.max_no_competitors != 0 &&
 			AI::GetInfoList()->size() == 0 &&
@@ -324,10 +319,9 @@ static void MaxNoAIsChange(int32_t new_value)
 
 /**
  * Check whether the road side may be changed.
- * @param new_value unused
  * @return true if the road side may be changed.
  */
-static bool CheckRoadSide(int32_t &new_value)
+static bool CheckRoadSide(int32_t &)
 {
 	return _game_mode == GM_MENU || !RoadVehiclesAreBuilt();
 }
@@ -418,7 +412,7 @@ static void UpdateFreeformEdges(int32_t new_value)
  * Changing the setting "allow multiple NewGRF sets" is not allowed
  * if there are vehicles.
  */
-static bool CheckDynamicEngines(int32_t &new_value)
+static bool CheckDynamicEngines(int32_t &)
 {
 	if (_game_mode == GM_MENU) return true;
 
@@ -448,19 +442,19 @@ static bool CheckMaxHeightLevel(int32_t &new_value)
 	return true;
 }
 
-static void StationCatchmentChanged(int32_t new_value)
+static void StationCatchmentChanged(int32_t)
 {
 	Station::RecomputeCatchmentForAll();
 	MarkWholeScreenDirty();
 }
 
-static void MaxVehiclesChanged(int32_t new_value)
+static void MaxVehiclesChanged(int32_t)
 {
 	InvalidateWindowClassesData(WC_BUILD_TOOLBAR);
 	MarkWholeScreenDirty();
 }
 
-static void InvalidateShipPathCache(int32_t new_value)
+static void InvalidateShipPathCache(int32_t)
 {
 	for (Ship *s : Ship::Iterate()) {
 		s->path.clear();
diff --git a/src/settingsgen/settingsgen.cpp b/src/settingsgen/settingsgen.cpp
index a160205d22..cf1a2bb4e6 100644
--- a/src/settingsgen/settingsgen.cpp
+++ b/src/settingsgen/settingsgen.cpp
@@ -159,7 +159,7 @@ struct SettingsIniFile : IniLoadFile {
 	{
 	}
 
-	virtual FILE *OpenFile(const std::string &filename, Subdirectory subdir, size_t *size)
+	virtual FILE *OpenFile(const std::string &filename, Subdirectory, size_t *size)
 	{
 		/* Open the text file in binary mode to prevent end-of-line translations
 		 * done by ftell() and friends, as defined by K&R. */
diff --git a/src/ship_cmd.cpp b/src/ship_cmd.cpp
index 7f07233a61..cab94cf334 100644
--- a/src/ship_cmd.cpp
+++ b/src/ship_cmd.cpp
@@ -325,7 +325,7 @@ void Ship::UpdateDeltaXY()
 /**
  * Test-procedure for HasVehicleOnPos to check for any ships which are visible and not stopped by the player.
  */
-static Vehicle *EnsureNoMovingShipProc(Vehicle *v, void *data)
+static Vehicle *EnsureNoMovingShipProc(Vehicle *v, void *)
 {
 	return v->type == VEH_SHIP && (v->vehstatus & (VS_HIDDEN | VS_STOPPED)) == 0 ? v : nullptr;
 }
diff --git a/src/signs_cmd.cpp b/src/signs_cmd.cpp
index 139d874c6c..b53a843caa 100644
--- a/src/signs_cmd.cpp
+++ b/src/signs_cmd.cpp
@@ -102,11 +102,10 @@ CommandCost CmdRenameSign(DoCommandFlag flags, SignID sign_id, const std::string
 
 /**
  * Callback function that is called after a sign is placed
- * @param cmd unused
  * @param result of the operation
  * @param new_sign ID of the placed sign.
  */
-void CcPlaceSign(Commands cmd, const CommandCost &result, SignID new_sign)
+void CcPlaceSign(Commands, const CommandCost &result, SignID new_sign)
 {
 	if (result.Failed()) return;
 
diff --git a/src/signs_gui.cpp b/src/signs_gui.cpp
index e3c9cd84ea..c45483168a 100644
--- a/src/signs_gui.cpp
+++ b/src/signs_gui.cpp
@@ -104,14 +104,14 @@ struct SignList {
 	}
 
 	/** Filter sign list excluding OWNER_DEITY */
-	static bool CDECL OwnerDeityFilter(const Sign * const *a, StringFilter &filter)
+	static bool CDECL OwnerDeityFilter(const Sign * const *a, StringFilter &)
 	{
 		/* You should never be able to edit signs of owner DEITY */
 		return (*a)->owner != OWNER_DEITY;
 	}
 
 	/** Filter sign list by owner */
-	static bool CDECL OwnerVisibilityFilter(const Sign * const *a, StringFilter &filter)
+	static bool CDECL OwnerVisibilityFilter(const Sign * const *a, StringFilter &)
 	{
 		assert(!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS));
 		/* Hide sign if non-own signs are hidden in the viewport */
@@ -231,7 +231,7 @@ struct SignListWindow : Window, SignList {
 		if (widget == WID_SIL_CAPTION) SetDParam(0, this->vscroll->GetCount());
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SIL_LIST: {
@@ -263,7 +263,7 @@ struct SignListWindow : Window, SignList {
 		this->vscroll->SetCapacityFromWidget(this, WID_SIL_LIST, WidgetDimensions::scaled.framerect.Vertical());
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SIL_LIST: {
@@ -325,7 +325,7 @@ struct SignListWindow : Window, SignList {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		/* When there is a filter string, we always need to rebuild the list even if
 		 * the amount of signs in total is unchanged, as the subset of signs that is
@@ -485,7 +485,7 @@ struct SignWindow : Window, SignList {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_QES_LOCATION: {
diff --git a/src/smallmap_gui.cpp b/src/smallmap_gui.cpp
index 4e17c1f55d..aed4abd03e 100644
--- a/src/smallmap_gui.cpp
+++ b/src/smallmap_gui.cpp
@@ -424,7 +424,7 @@ static inline uint32_t GetSmallMapContoursPixels(TileIndex tile, TileType t)
  * @param t    Effective tile type of the tile (see #SmallMapWindow::GetTileColours).
  * @return The colour of tile in the small map in mode "Vehicles"
  */
-static inline uint32_t GetSmallMapVehiclesPixels(TileIndex tile, TileType t)
+static inline uint32_t GetSmallMapVehiclesPixels(TileIndex, TileType t)
 {
 	const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
 	return ApplyMask(cs->default_colour, &_smallmap_vehicles_andor[t]);
@@ -1404,7 +1404,7 @@ int SmallMapWindow::GetPositionOnLegend(Point pt)
 	return (column * number_of_rows) + line;
 }
 
-/* virtual */ void SmallMapWindow::OnMouseOver(Point pt, int widget)
+/* virtual */ void SmallMapWindow::OnMouseOver([[maybe_unused]] Point pt, int widget)
 {
 	IndustryType new_highlight = INVALID_INDUSTRYTYPE;
 	if (widget == WID_SM_LEGEND && this->map_type == SMT_INDUSTRY) {
@@ -1420,7 +1420,7 @@ int SmallMapWindow::GetPositionOnLegend(Point pt)
 	}
 }
 
-/* virtual */ void SmallMapWindow::OnClick(Point pt, int widget, int click_count)
+/* virtual */ void SmallMapWindow::OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count)
 {
 	switch (widget) {
 		case WID_SM_MAP: { // Map window
@@ -1565,7 +1565,7 @@ int SmallMapWindow::GetPositionOnLegend(Point pt)
 	this->SetDirty();
 }
 
-/* virtual */ bool SmallMapWindow::OnRightClick(Point pt, int widget)
+/* virtual */ bool SmallMapWindow::OnRightClick([[maybe_unused]] Point pt, int widget)
 {
 	if (widget != WID_SM_MAP || _scrolling_viewport) return false;
 
diff --git a/src/smallmap_gui.h b/src/smallmap_gui.h
index f86fbe9948..5aa8cb34eb 100644
--- a/src/smallmap_gui.h
+++ b/src/smallmap_gui.h
@@ -204,12 +204,12 @@ public:
 	void OnInit() override;
 	void OnPaint() override;
 	void DrawWidget(const Rect &r, int widget) const override;
-	void OnClick(Point pt, int widget, int click_count) override;
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override;
 	void OnInvalidateData(int data = 0, bool gui_scope = true) override;
 	bool OnRightClick(Point pt, int widget) override;
 	void OnMouseWheel(int wheel) override;
 	void OnScroll(Point delta) override;
-	void OnMouseOver(Point pt, int widget) override;
+	void OnMouseOver([[maybe_unused]] Point pt, int widget) override;
 };
 
 #endif /* SMALLMAP_GUI_H */
diff --git a/src/sound/cocoa_s.cpp b/src/sound/cocoa_s.cpp
index 628ac06849..f059384181 100644
--- a/src/sound/cocoa_s.cpp
+++ b/src/sound/cocoa_s.cpp
@@ -36,7 +36,7 @@ static FSoundDriver_Cocoa iFSoundDriver_Cocoa;
 static AudioUnit _outputAudioUnit;
 
 /* The CoreAudio callback */
-static OSStatus audioCallback(void *inRefCon, AudioUnitRenderActionFlags *inActionFlags, const AudioTimeStamp *inTimeStamp, UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * ioData)
+static OSStatus audioCallback(void *, AudioUnitRenderActionFlags *, const AudioTimeStamp *, UInt32, UInt32, AudioBufferList *ioData)
 {
 	MxMixSamples(ioData->mBuffers[0].mData, ioData->mBuffers[0].mDataByteSize / 4);
 
diff --git a/src/sound/null_s.h b/src/sound/null_s.h
index 9bc660b92d..ca699da236 100644
--- a/src/sound/null_s.h
+++ b/src/sound/null_s.h
@@ -15,7 +15,7 @@
 /** Implementation of the null sound driver. */
 class SoundDriver_Null : public SoundDriver {
 public:
-	const char *Start(const StringList &param) override { return nullptr; }
+	const char *Start(const StringList &) override { return nullptr; }
 
 	void Stop() override { }
 	const char *GetName() const override { return "null"; }
diff --git a/src/sound/sdl2_s.cpp b/src/sound/sdl2_s.cpp
index 9d1e47fabb..0a49ad0297 100644
--- a/src/sound/sdl2_s.cpp
+++ b/src/sound/sdl2_s.cpp
@@ -22,11 +22,10 @@ static FSoundDriver_SDL iFSoundDriver_SDL;
 
 /**
  * Callback that fills the sound buffer.
- * @param userdata Ignored.
  * @param stream   The stream to put data into.
  * @param len      The length of the stream in bytes.
  */
-static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
+static void CDECL fill_sound_buffer(void *, Uint8 *stream, int len)
 {
 	MxMixSamples(stream, len / 4);
 }
diff --git a/src/sound/sdl_s.cpp b/src/sound/sdl_s.cpp
index 737192a7ed..4aeaa35b26 100644
--- a/src/sound/sdl_s.cpp
+++ b/src/sound/sdl_s.cpp
@@ -22,11 +22,10 @@ static FSoundDriver_SDL iFSoundDriver_SDL;
 
 /**
  * Callback that fills the sound buffer.
- * @param userdata Ignored.
  * @param stream   The stream to put data into.
  * @param len      The length of the stream in bytes.
  */
-static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
+static void CDECL fill_sound_buffer(void *, Uint8 *stream, int len)
 {
 	MxMixSamples(stream, len / 4);
 }
diff --git a/src/sound/win32_s.cpp b/src/sound/win32_s.cpp
index f9fda5a349..b7220b7786 100644
--- a/src/sound/win32_s.cpp
+++ b/src/sound/win32_s.cpp
@@ -40,7 +40,7 @@ static void PrepareHeader(WAVEHDR *hdr)
 	if (waveOutPrepareHeader(_waveout, hdr, sizeof(WAVEHDR)) != MMSYSERR_NOERROR) throw "waveOutPrepareHeader failed";
 }
 
-static DWORD WINAPI SoundThread(LPVOID arg)
+static DWORD WINAPI SoundThread(LPVOID)
 {
 	SetCurrentThreadName("ottd:win-sound");
 
diff --git a/src/station.cpp b/src/station.cpp
index 85bbc09f1a..76b1c7d3ac 100644
--- a/src/station.cpp
+++ b/src/station.cpp
@@ -162,9 +162,8 @@ Station::~Station()
 /**
  * Invalidating of the JoinStation window has to be done
  * after removing item from the pool.
- * @param index index of deleted item
  */
-void BaseStation::PostDestructor(size_t index)
+void BaseStation::PostDestructor(size_t)
 {
 	InvalidateWindowData(WC_SELECT_STATION, 0, 0);
 }
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index e9761afd81..33aa52f5da 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -3259,12 +3259,12 @@ void StationPickerDrawSprite(int x, int y, StationType st, RailType railtype, Ro
 	DrawRailTileSeqInGUI(x, y, t, st == STATION_WAYPOINT ? 0 : total_offset, 0, pal);
 }
 
-static int GetSlopePixelZ_Station(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Station(TileIndex tile, uint, uint, bool)
 {
 	return GetTileMaxPixelZ(tile);
 }
 
-static Foundation GetFoundation_Station(TileIndex tile, Slope tileh)
+static Foundation GetFoundation_Station(TileIndex, Slope tileh)
 {
 	return FlatteningFoundation(tileh);
 }
@@ -4137,7 +4137,7 @@ const StationList *StationFinder::GetStations()
 			assert(this->w == 1 && this->h == 1);
 			AddNearbyStationsByCatchment(this->tile, &this->stations, Town::GetByTile(this->tile)->stations_near);
 		} else {
-			ForAllStationsAroundTiles(*this, [this](Station *st, TileIndex tile) {
+			ForAllStationsAroundTiles(*this, [this](Station *st, TileIndex) {
 				this->stations.insert(st);
 				return true;
 			});
diff --git a/src/station_gui.cpp b/src/station_gui.cpp
index 87f64167f5..d05a3aeeb6 100644
--- a/src/station_gui.cpp
+++ b/src/station_gui.cpp
@@ -142,7 +142,7 @@ void CheckRedrawStationCoverage(const Window *w)
 	}
 }
 
-void CheckRedrawWaypointCoverage(const Window *w)
+void CheckRedrawWaypointCoverage(const Window *)
 {
 	/* Test if ctrl state changed */
 	static bool _last_ctrl_pressed;
@@ -385,7 +385,7 @@ public:
 		this->last_sorting = this->stations.GetListing();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_STL_SORTBY: {
@@ -521,7 +521,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_STL_LIST: {
@@ -666,7 +666,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == 0) {
 			/* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
@@ -1380,7 +1380,7 @@ struct StationViewWindow : public Window {
 		data->Update(count);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_SV_WAITING:
@@ -1910,7 +1910,7 @@ struct StationViewWindow : public Window {
 		this->SetWidgetDirty(WID_SV_WAITING);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SV_WAITING:
@@ -2101,7 +2101,7 @@ struct StationViewWindow : public Window {
 	 * @param data Information about the changed data. If it's a valid cargo ID, invalidate the cargo data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (gui_scope) {
 			if (data >= 0 && data < NUM_CARGO) {
@@ -2295,7 +2295,7 @@ struct SelectStationWindow : Window {
 		this->Window::Close();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_JS_PANEL) return;
 
@@ -2334,7 +2334,7 @@ struct SelectStationWindow : Window {
 
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget != WID_JS_PANEL) return;
 
@@ -2348,7 +2348,7 @@ struct SelectStationWindow : Window {
 		CloseWindowById(WC_SELECT_STATION, 0);
 	}
 
-	void OnRealtimeTick(uint delta_ms) override
+	void OnRealtimeTick([[maybe_unused]] uint delta_ms) override
 	{
 		if (_thd.dirty & 2) {
 			_thd.dirty &= ~2;
@@ -2366,7 +2366,7 @@ struct SelectStationWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		FindStationsNearby<T>(this->area, true);
@@ -2374,7 +2374,7 @@ struct SelectStationWindow : Window {
 		this->SetDirty();
 	}
 
-	void OnMouseOver(Point pt, int widget) override
+	void OnMouseOver([[maybe_unused]] Point pt, int widget) override
 	{
 		if (widget != WID_JS_PANEL) {
 			SetViewportCatchmentSpecializedStation<T>(nullptr, true);
diff --git a/src/statusbar_gui.cpp b/src/statusbar_gui.cpp
index 2719fef18d..b1ac784e24 100644
--- a/src/statusbar_gui.cpp
+++ b/src/statusbar_gui.cpp
@@ -72,18 +72,18 @@ struct StatusBarWindow : Window {
 		PositionStatusbar(this);
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = { 0, _screen.height - sm_height };
 		return pt;
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		Window::FindWindowPlacementAndResize(_toolbar_width, def_height);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		Dimension d;
 		switch (widget) {
@@ -174,7 +174,7 @@ struct StatusBarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		switch (data) {
@@ -190,7 +190,7 @@ struct StatusBarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_S_MIDDLE: ShowLastNewsMessage(); break;
diff --git a/src/story_gui.cpp b/src/story_gui.cpp
index b9c6a29b5c..03324fca8b 100644
--- a/src/story_gui.cpp
+++ b/src/story_gui.cpp
@@ -751,7 +751,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_SB_SEL_PAGE && widget != WID_SB_PAGE_PANEL) return;
 
@@ -801,7 +801,7 @@ public:
 		this->vscroll->SetCount(this->GetContentHeight());
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_SB_SEL_PAGE: {
@@ -857,7 +857,7 @@ public:
 	 *   >= 0   Id of the page that needs to be refreshed. If it is not the current page, nothing happens.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -898,7 +898,7 @@ public:
 		this->SetWidgetDirty(WID_SB_PAGE_PANEL);
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		const StoryPageElement *const pe = StoryPageElement::GetIfValid(this->active_button_id);
 		if (pe == nullptr || pe->type != SPET_BUTTON_TILE) {
diff --git a/src/strgen/strgen_base.cpp b/src/strgen/strgen_base.cpp
index 1913b1925a..fc5e471f90 100644
--- a/src/strgen/strgen_base.cpp
+++ b/src/strgen/strgen_base.cpp
@@ -325,7 +325,7 @@ static void EmitWordList(Buffer *buffer, const std::vector<const char *> &words,
 	}
 }
 
-void EmitPlural(Buffer *buffer, char *buf, int value)
+void EmitPlural(Buffer *buffer, char *buf, int)
 {
 	int argidx = _cur_argidx;
 	int offset = -1;
@@ -378,7 +378,7 @@ void EmitPlural(Buffer *buffer, char *buf, int value)
 }
 
 
-void EmitGender(Buffer *buffer, char *buf, int value)
+void EmitGender(Buffer *buffer, char *buf, int)
 {
 	int argidx = _cur_argidx;
 	int offset = 0;
@@ -531,7 +531,7 @@ StringReader::StringReader(StringData &data, const std::string &file, bool maste
 {
 }
 
-ParsedCommandStruct ExtractCommandString(const char *s, bool warnings)
+ParsedCommandStruct ExtractCommandString(const char *s, bool)
 {
 	char param[MAX_COMMAND_PARAM_SIZE];
 	int argno;
diff --git a/src/strings.cpp b/src/strings.cpp
index 959d68dfd5..8b777a79be 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -2170,7 +2170,7 @@ class LanguagePackGlyphSearcher : public MissingGlyphSearcher {
 		return false;
 	}
 
-	void SetFontNames(FontCacheSettings *settings, const char *font_name, const void *os_data) override
+	void SetFontNames([[maybe_unused]] FontCacheSettings *settings, [[maybe_unused]] const char *font_name, [[maybe_unused]] const void *os_data) override
 	{
 #if defined(WITH_FREETYPE) || defined(_WIN32) || defined(WITH_COCOA)
 		settings->small.font = font_name;
diff --git a/src/subsidy_gui.cpp b/src/subsidy_gui.cpp
index ff6efbc651..3074431e8f 100644
--- a/src/subsidy_gui.cpp
+++ b/src/subsidy_gui.cpp
@@ -36,7 +36,7 @@ struct SubsidyListWindow : Window {
 		this->OnInvalidateData(0);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget != WID_SUL_PANEL) return;
 
@@ -125,7 +125,7 @@ struct SubsidyListWindow : Window {
 		return 3 + num_awarded + num_not_awarded;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_SUL_PANEL) return;
 		Dimension d = maxdim(GetStringBoundingBox(STR_SUBSIDIES_OFFERED_TITLE), GetStringBoundingBox(STR_SUBSIDIES_SUBSIDISED_TITLE));
@@ -210,7 +210,7 @@ struct SubsidyListWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->vscroll->SetCount(this->CountLines());
diff --git a/src/table/newgrf_debug_data.h b/src/table/newgrf_debug_data.h
index 7427a5ecc1..2c92db398c 100644
--- a/src/table/newgrf_debug_data.h
+++ b/src/table/newgrf_debug_data.h
@@ -137,7 +137,7 @@ static const NIVariable _niv_stations[] = {
 class NIHStation : public NIHelper {
 	bool IsInspectable(uint index) const override        { return GetStationSpec(index) != nullptr; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_FAKE_TOWNS, Station::GetByTile(index)->town->index); }
-	const void *GetInstance(uint index)const override    { return nullptr; }
+	const void *GetInstance(uint ) const override        { return nullptr; }
 	const void *GetSpec(uint index) const override       { return GetStationSpec(index); }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_STATION_NAME, GetStationIndex(index), index); }
 	uint32_t GetGRFID(uint index) const override           { return (this->IsInspectable(index)) ? GetStationSpec(index)->grf_prop.grffile->grfid : 0; }
@@ -202,7 +202,7 @@ static const NIVariable _niv_house[] = {
 class NIHHouse : public NIHelper {
 	bool IsInspectable(uint index) const override        { return HouseSpec::Get(GetHouseType(index))->grf_prop.grffile != nullptr; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_FAKE_TOWNS, GetTownIndex(index)); }
-	const void *GetInstance(uint index)const override    { return nullptr; }
+	const void *GetInstance(uint)const override          { return nullptr; }
 	const void *GetSpec(uint index) const override       { return HouseSpec::Get(GetHouseType(index)); }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_TOWN_NAME, GetTownIndex(index), index); }
 	uint32_t GetGRFID(uint index) const override           { return (this->IsInspectable(index)) ? HouseSpec::Get(GetHouseType(index))->grf_prop.grffile->grfid : 0; }
@@ -252,7 +252,7 @@ static const NIVariable _niv_industrytiles[] = {
 class NIHIndustryTile : public NIHelper {
 	bool IsInspectable(uint index) const override        { return GetIndustryTileSpec(GetIndustryGfx(index))->grf_prop.grffile != nullptr; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_INDUSTRIES, GetIndustryIndex(index)); }
-	const void *GetInstance(uint index)const override    { return nullptr; }
+	const void *GetInstance(uint)const override          { return nullptr; }
 	const void *GetSpec(uint index) const override       { return GetIndustryTileSpec(GetIndustryGfx(index)); }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_INDUSTRY_NAME, GetIndustryIndex(index), index); }
 	uint32_t GetGRFID(uint index) const override           { return (this->IsInspectable(index)) ? GetIndustryTileSpec(GetIndustryGfx(index))->grf_prop.grffile->grfid : 0; }
@@ -372,9 +372,9 @@ class NIHIndustry : public NIHelper {
 		return ro.GetScope(VSG_SCOPE_SELF)->GetVariable(var, param, avail);
 	}
 
-	uint GetPSASize(uint index, uint32_t grfid) const override { return cpp_lengthof(PersistentStorage, storage); }
+	uint GetPSASize(uint, uint32_t) const override { return cpp_lengthof(PersistentStorage, storage); }
 
-	const int32_t *GetPSAFirstPosition(uint index, uint32_t grfid) const override
+	const int32_t *GetPSAFirstPosition(uint index, uint32_t) const override
 	{
 		const Industry *i = (const Industry *)this->GetInstance(index);
 		if (i->psa == nullptr) return nullptr;
@@ -457,12 +457,12 @@ static const NIVariable _niv_railtypes[] = {
 };
 
 class NIHRailType : public NIHelper {
-	bool IsInspectable(uint index) const override        { return true; }
-	uint GetParent(uint index) const override            { return UINT32_MAX; }
-	const void *GetInstance(uint index)const override    { return nullptr; }
-	const void *GetSpec(uint index) const override       { return nullptr; }
+	bool IsInspectable(uint) const override              { return true; }
+	uint GetParent(uint) const override                  { return UINT32_MAX; }
+	const void *GetInstance(uint) const override         { return nullptr; }
+	const void *GetSpec(uint) const override             { return nullptr; }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_NEWGRF_INSPECT_CAPTION_OBJECT_AT_RAIL_TYPE, INVALID_STRING_ID, index); }
-	uint32_t GetGRFID(uint index) const override           { return 0; }
+	uint32_t GetGRFID(uint) const override               { return 0; }
 
 	uint Resolve(uint index, uint var, uint param, bool *avail) const override
 	{
@@ -495,7 +495,7 @@ static const NICallback _nic_airporttiles[] = {
 class NIHAirportTile : public NIHelper {
 	bool IsInspectable(uint index) const override        { return AirportTileSpec::Get(GetAirportGfx(index))->grf_prop.grffile != nullptr; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_AIRPORTS, GetStationIndex(index)); }
-	const void *GetInstance(uint index)const override    { return nullptr; }
+	const void *GetInstance(uint)const override          { return nullptr; }
 	const void *GetSpec(uint index) const override       { return AirportTileSpec::Get(GetAirportGfx(index)); }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_STATION_NAME, GetStationIndex(index), index); }
 	uint32_t GetGRFID(uint index) const override           { return (this->IsInspectable(index)) ? AirportTileSpec::Get(GetAirportGfx(index))->grf_prop.grffile->grfid : 0; }
@@ -548,9 +548,9 @@ class NIHAiport : public NIHelper {
 		return ro.GetScope(VSG_SCOPE_SELF)->GetVariable(var, param, avail);
 	}
 
-	uint GetPSASize(uint index, uint32_t grfid) const override { return cpp_lengthof(PersistentStorage, storage); }
+	uint GetPSASize(uint, uint32_t) const override { return cpp_lengthof(PersistentStorage, storage); }
 
-	const int32_t *GetPSAFirstPosition(uint index, uint32_t grfid) const override
+	const int32_t *GetPSAFirstPosition(uint index, uint32_t) const override
 	{
 		const Station *st = (const Station *)this->GetInstance(index);
 		if (st->airport.psa == nullptr) return nullptr;
@@ -583,13 +583,13 @@ static const NIVariable _niv_towns[] = {
 
 class NIHTown : public NIHelper {
 	bool IsInspectable(uint index) const override        { return Town::IsValidID(index); }
-	uint GetParent(uint index) const override            { return UINT32_MAX; }
+	uint GetParent(uint) const override                  { return UINT32_MAX; }
 	const void *GetInstance(uint index)const override    { return Town::Get(index); }
-	const void *GetSpec(uint index) const override       { return nullptr; }
+	const void *GetSpec(uint) const override             { return nullptr; }
 	void SetStringParameters(uint index) const override  { this->SetSimpleStringParameters(STR_TOWN_NAME, index); }
-	uint32_t GetGRFID(uint index) const override           { return 0; }
+	uint32_t GetGRFID(uint) const override               { return 0; }
 	bool PSAWithParameter() const override               { return true; }
-	uint GetPSASize(uint index, uint32_t grfid) const override { return cpp_lengthof(PersistentStorage, storage); }
+	uint GetPSASize(uint, uint32_t) const override       { return cpp_lengthof(PersistentStorage, storage); }
 
 	uint Resolve(uint index, uint var, uint param, bool *avail) const override
 	{
@@ -628,12 +628,12 @@ static const NIVariable _niv_roadtypes[] = {
 };
 
 class NIHRoadType : public NIHelper {
-	bool IsInspectable(uint index) const override        { return true; }
-	uint GetParent(uint index) const override            { return UINT32_MAX; }
-	const void *GetInstance(uint index) const override   { return nullptr; }
-	const void *GetSpec(uint index) const override       { return nullptr; }
+	bool IsInspectable(uint) const override              { return true; }
+	uint GetParent(uint) const override                  { return UINT32_MAX; }
+	const void *GetInstance(uint) const override         { return nullptr; }
+	const void *GetSpec(uint) const override             { return nullptr; }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_NEWGRF_INSPECT_CAPTION_OBJECT_AT_RAIL_TYPE, INVALID_STRING_ID, index); }
-	uint32_t GetGRFID(uint index) const override           { return 0; }
+	uint32_t GetGRFID(uint) const override               { return 0; }
 
 	uint Resolve(uint index, uint var, uint param, bool *avail) const override
 	{
@@ -695,7 +695,7 @@ static const NIVariable _nif_roadstops[] = {
 class NIHRoadStop : public NIHelper {
 	bool IsInspectable(uint index) const override        { return GetRoadStopSpec(index) != nullptr; }
 	uint GetParent(uint index) const override            { return GetInspectWindowNumber(GSF_FAKE_TOWNS, BaseStation::GetByTile(index)->town->index); }
-	const void *GetInstance(uint index)const override    { return nullptr; }
+	const void *GetInstance(uint)const override          { return nullptr; }
 	const void *GetSpec(uint index) const override       { return GetRoadStopSpec(index); }
 	void SetStringParameters(uint index) const override  { this->SetObjectAtStringParameters(STR_STATION_NAME, GetStationIndex(index), index); }
 	uint32_t GetGRFID(uint index) const override           { return (this->IsInspectable(index)) ? GetRoadStopSpec(index)->grf_prop.grffile->grfid : 0; }
diff --git a/src/terraform_gui.cpp b/src/terraform_gui.cpp
index f68e675a11..f791c90852 100644
--- a/src/terraform_gui.cpp
+++ b/src/terraform_gui.cpp
@@ -44,7 +44,7 @@
 
 #include "safeguards.h"
 
-void CcTerraform(Commands cmd, const CommandCost &result, Money, TileIndex tile)
+void CcTerraform(Commands, const CommandCost &result, Money, TileIndex tile)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
@@ -175,7 +175,7 @@ struct TerraformToolbarWindow : Window {
 		show_object->SetDisplayedPlane(ObjectClass::GetUIClassCount() != 0 ? 0 : SZSP_NONE);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget < WID_TT_BUTTONS_START) return;
 
@@ -222,7 +222,7 @@ struct TerraformToolbarWindow : Window {
 		}
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (this->last_user_action) {
 			case WID_TT_LOWER_LAND: // Lower land button
@@ -253,19 +253,19 @@ struct TerraformToolbarWindow : Window {
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = GetToolbarAlignedWindowPosition(sm_width);
 		pt.y += sm_height;
 		return pt;
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1) {
 			switch (select_proc) {
@@ -500,10 +500,9 @@ static const NWidgetPart _nested_scen_edit_land_gen_widgets[] = {
 
 /**
  * Callback function for the scenario editor 'reset landscape' confirmation window
- * @param w Window unused
  * @param confirmed boolean value, true when yes was clicked, false otherwise
  */
-static void ResetLandscapeConfirmationCallback(Window *w, bool confirmed)
+static void ResetLandscapeConfirmationCallback(Window *, bool confirmed)
 {
 	if (confirmed) {
 		/* Set generating_world to true to get instant-green grass after removing
@@ -554,7 +553,7 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget != WID_ETT_DOTS) return;
 
@@ -579,7 +578,7 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
 		} while (--n);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget < WID_ETT_BUTTONS_START) return;
 
@@ -653,7 +652,7 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
 		}
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (this->last_user_action) {
 			case WID_ETT_DEMOLISH: // Demolish aka dynamite button
@@ -684,12 +683,12 @@ struct ScenarioEditorLandscapeGenerationWindow : Window {
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (pt.x != -1) {
 			switch (select_proc) {
diff --git a/src/textfile_gui.cpp b/src/textfile_gui.cpp
index 6eaf754dcb..54b7076210 100644
--- a/src/textfile_gui.cpp
+++ b/src/textfile_gui.cpp
@@ -126,7 +126,7 @@ uint TextfileWindow::GetContentHeight()
 	return this->lines.back().bottom;
 }
 
-/* virtual */ void TextfileWindow::UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
+/* virtual */ void TextfileWindow::UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize)
 {
 	switch (widget) {
 		case WID_TF_BACKGROUND:
@@ -516,7 +516,7 @@ void TextfileWindow::AfterLoadMarkdown()
 	}
 }
 
-/* virtual */ void TextfileWindow::OnClick(Point pt, int widget, int click_count)
+/* virtual */ void TextfileWindow::OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count)
 {
 	switch (widget) {
 		case WID_TF_WRAPTEXT:
@@ -586,7 +586,7 @@ void TextfileWindow::AfterLoadMarkdown()
 	this->SetupScrollbars(false);
 }
 
-/* virtual */ void TextfileWindow::OnInvalidateData(int data, bool gui_scope)
+/* virtual */ void TextfileWindow::OnInvalidateData([[maybe_unused]] int data, [[maybe_unused]] bool gui_scope)
 {
 	if (!gui_scope) return;
 
@@ -635,7 +635,7 @@ void TextfileWindow::ScrollToLine(size_t line)
 	return true;
 }
 
-/* virtual */ void TextfileWindow::SetFontNames(FontCacheSettings *settings, const char *font_name, const void *os_data)
+/* virtual */ void TextfileWindow::SetFontNames([[maybe_unused]] FontCacheSettings *settings, [[maybe_unused]] const char *font_name, [[maybe_unused]] const void *os_data)
 {
 #if defined(WITH_FREETYPE) || defined(_WIN32) || defined(WITH_COCOA)
 	settings->mono.font = font_name;
diff --git a/src/textfile_gui.h b/src/textfile_gui.h
index f4e61fe10e..119b0b6081 100644
--- a/src/textfile_gui.h
+++ b/src/textfile_gui.h
@@ -25,8 +25,8 @@ struct TextfileWindow : public Window, MissingGlyphSearcher {
 
 	TextfileWindow(TextfileType file_type);
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override;
-	void OnClick(Point pt, int widget, int click_count) override;
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override;
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override;
 	void DrawWidget(const Rect &r, int widget) const override;
 	void OnResize() override;
 	void OnInvalidateData(int data = 0, bool gui_scope = true) override;
diff --git a/src/tgp.cpp b/src/tgp.cpp
index f9337d5a42..5a66c69de8 100644
--- a/src/tgp.cpp
+++ b/src/tgp.cpp
@@ -439,7 +439,7 @@ static void HeightMapGetMinMaxAvg(Height *min_ptr, Height *max_ptr, Height *avg_
 }
 
 /** Dill histogram and return pointer to its base point - to the count of zero heights */
-static int *HeightMapMakeHistogram(Height h_min, Height h_max, int *hist_buf)
+static int *HeightMapMakeHistogram(Height h_min, [[maybe_unused]] Height h_max, int *hist_buf)
 {
 	int *hist = hist_buf - h_min;
 
diff --git a/src/timer/timer_game_calendar.cpp b/src/timer/timer_game_calendar.cpp
index 7e3a47e0c4..e14d252b2e 100644
--- a/src/timer/timer_game_calendar.cpp
+++ b/src/timer/timer_game_calendar.cpp
@@ -182,7 +182,7 @@ void TimeoutTimer<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed trigge
 }
 
 template<>
-void TimerManager<TimerGameCalendar>::Elapsed(TimerGameCalendar::TElapsed delta)
+void TimerManager<TimerGameCalendar>::Elapsed([[maybe_unused]] TimerGameCalendar::TElapsed delta)
 {
 	assert(delta == 1);
 
diff --git a/src/timer/timer_game_realtime.cpp b/src/timer/timer_game_realtime.cpp
index 379924d139..f3aa7dac1d 100644
--- a/src/timer/timer_game_realtime.cpp
+++ b/src/timer/timer_game_realtime.cpp
@@ -63,7 +63,7 @@ void TimerManager<TimerGameRealtime>::Elapsed(TimerGameRealtime::TElapsed delta)
 
 #ifdef WITH_ASSERT
 template<>
-void TimerManager<TimerGameRealtime>::Validate(TimerGameRealtime::TPeriod period)
+void TimerManager<TimerGameRealtime>::Validate(TimerGameRealtime::TPeriod)
 {
 }
 #endif /* WITH_ASSERT */
diff --git a/src/timer/timer_game_tick.cpp b/src/timer/timer_game_tick.cpp
index 18203d7b75..ec68a0d8bb 100644
--- a/src/timer/timer_game_tick.cpp
+++ b/src/timer/timer_game_tick.cpp
@@ -62,7 +62,7 @@ void TimerManager<TimerGameTick>::Elapsed(TimerGameTick::TElapsed delta)
 
 #ifdef WITH_ASSERT
 template<>
-void TimerManager<TimerGameTick>::Validate(TimerGameTick::TPeriod period)
+void TimerManager<TimerGameTick>::Validate(TimerGameTick::TPeriod)
 {
 }
 #endif /* WITH_ASSERT */
diff --git a/src/timer/timer_window.cpp b/src/timer/timer_window.cpp
index f99d6372b3..dc6938af1b 100644
--- a/src/timer/timer_window.cpp
+++ b/src/timer/timer_window.cpp
@@ -61,7 +61,7 @@ void TimerManager<TimerWindow>::Elapsed(TimerWindow::TElapsed delta)
 
 #ifdef WITH_ASSERT
 template<>
-void TimerManager<TimerWindow>::Validate(TimerWindow::TPeriod period)
+void TimerManager<TimerWindow>::Validate(TimerWindow::TPeriod)
 {
 }
 #endif /* WITH_ASSERT */
diff --git a/src/timetable_gui.cpp b/src/timetable_gui.cpp
index 36d8bcb693..2f9b792c18 100644
--- a/src/timetable_gui.cpp
+++ b/src/timetable_gui.cpp
@@ -190,7 +190,7 @@ struct TimetableWindow : Window {
 		return (travelling && v->lateness_counter < 0);
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_VT_ARRIVAL_DEPARTURE_PANEL:
@@ -210,7 +210,7 @@ struct TimetableWindow : Window {
 		}
 	}
 
-	int GetOrderFromTimetableWndPt(int y, const Vehicle *v)
+	int GetOrderFromTimetableWndPt(int y, [[maybe_unused]] const Vehicle *v)
 	{
 		int sel = this->vscroll->GetScrolledRowFromWidget(y, this, WID_VT_TIMETABLE_PANEL, WidgetDimensions::scaled.framerect.top);
 		if (sel == INT_MAX) return INVALID_ORDER;
@@ -223,7 +223,7 @@ struct TimetableWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		switch (data) {
 			case VIWD_AUTOREPLACE:
@@ -538,7 +538,7 @@ struct TimetableWindow : Window {
 		return { order_number, mtf };
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		const Vehicle *v = this->vehicle;
 
diff --git a/src/toolbar_gui.cpp b/src/toolbar_gui.cpp
index 0195a710cf..2f7c7191a2 100644
--- a/src/toolbar_gui.cpp
+++ b/src/toolbar_gui.cpp
@@ -108,7 +108,7 @@ public:
 		return DropDownListStringItem::Width() + this->checkmark_width;
 	}
 
-	void Draw(const Rect &r, bool sel, Colours bg_colour) const override
+	void Draw(const Rect &r, bool sel, Colours) const override
 	{
 		bool rtl = _current_text_dir == TD_RTL;
 		Rect tr = r.Shrink(WidgetDimensions::scaled.dropdowntext, RectPadding::zero);
@@ -147,12 +147,12 @@ public:
 		return GetStringBoundingBox(STR_COMPANY_NAME_COMPANY_NUM).width + this->icon_size.width + this->lock_size.width + WidgetDimensions::scaled.dropdowntext.Horizontal() + WidgetDimensions::scaled.hsep_wide;
 	}
 
-	uint Height(uint width) const override
+	uint Height(uint) const override
 	{
 		return std::max(std::max(this->icon_size.height, this->lock_size.height) + WidgetDimensions::scaled.imgbtn.Vertical(), (uint)FONT_HEIGHT_NORMAL);
 	}
 
-	void Draw(const Rect &r, bool sel, Colours bg_colour) const override
+	void Draw(const Rect &r, bool sel, Colours) const override
 	{
 		CompanyID company = (CompanyID)this->result;
 		bool rtl = _current_text_dir == TD_RTL;
@@ -270,7 +270,7 @@ static CallBackFunction SelectSignTool()
 
 /* --- Pausing --- */
 
-static CallBackFunction ToolbarPauseClick(Window *w)
+static CallBackFunction ToolbarPauseClick(Window *)
 {
 	if (_networking && !_network_server) return CBF_NONE; // only server can pause the game
 
@@ -283,10 +283,9 @@ static CallBackFunction ToolbarPauseClick(Window *w)
 /**
  * Toggle fast forward mode.
  *
- * @param w Unused.
  * @return #CBF_NONE
  */
-static CallBackFunction ToolbarFastForwardClick(Window *w)
+static CallBackFunction ToolbarFastForwardClick(Window *)
 {
 	if (_networking) return CBF_NONE; // no fast forward in network game
 
@@ -551,10 +550,9 @@ static CallBackFunction ToolbarSubsidiesClick(Window *w)
 /**
  * Handle click on the entry in the Subsidies menu.
  *
- * @param index Unused.
  * @return #CBF_NONE
  */
-static CallBackFunction MenuClickSubsidies(int index)
+static CallBackFunction MenuClickSubsidies(int)
 {
 	ShowSubsidiesList();
 	return CBF_NONE;
@@ -985,10 +983,9 @@ static CallBackFunction ToolbarBuildWaterClick(Window *w)
 /**
  * Handle click on the entry in the Build Waterways menu.
  *
- * @param index Unused.
  * @return #CBF_NONE
  */
-static CallBackFunction MenuClickBuildWater(int index)
+static CallBackFunction MenuClickBuildWater(int)
 {
 	ShowBuildDocksToolbar();
 	return CBF_NONE;
@@ -1008,10 +1005,9 @@ static CallBackFunction ToolbarBuildAirClick(Window *w)
 /**
  * Handle click on the entry in the Build Air menu.
  *
- * @param index Unused.
  * @return #CBF_NONE
  */
-static CallBackFunction MenuClickBuildAir(int index)
+static CallBackFunction MenuClickBuildAir(int)
 {
 	ShowBuildAirToolbar();
 	return CBF_NONE;
@@ -1057,10 +1053,9 @@ static CallBackFunction ToolbarMusicClick(Window *w)
 /**
  * Handle click on the entry in the Music menu.
  *
- * @param index Unused.
  * @return #CBF_NONE
  */
-static CallBackFunction MenuClickMusicWindow(int index)
+static CallBackFunction MenuClickMusicWindow(int)
 {
 	ShowMusicWindow();
 	return CBF_NONE;
@@ -1321,7 +1316,7 @@ static CallBackFunction ToolbarScenPlaceSign(Window *w)
 	return SelectSignTool();
 }
 
-static CallBackFunction ToolbarBtn_NULL(Window *w)
+static CallBackFunction ToolbarBtn_NULL(Window *)
 {
 	return CBF_NONE;
 }
@@ -2009,7 +2004,7 @@ struct MainToolbarWindow : Window {
 		DoZoomInOutWindow(ZOOM_NONE, this);
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		Window::FindWindowPlacementAndResize(_toolbar_width, def_height);
 	}
@@ -2029,7 +2024,7 @@ struct MainToolbarWindow : Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (_game_mode != GM_MENU && !this->IsWidgetDisabled(widget)) _toolbar_button_procs[widget](this);
 	}
@@ -2090,7 +2085,7 @@ struct MainToolbarWindow : Window {
 		return ES_HANDLED;
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (_last_started_action) {
 			case CBF_PLACE_SIGN:
@@ -2137,7 +2132,7 @@ struct MainToolbarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		HandleZoomMessage(this, GetMainWindow()->viewport, WID_TN_ZOOM_IN, WID_TN_ZOOM_OUT);
@@ -2349,7 +2344,7 @@ struct ScenarioEditorToolbarWindow : Window {
 		DoZoomInOutWindow(ZOOM_NONE, this);
 	}
 
-	void FindWindowPlacementAndResize(int def_width, int def_height) override
+	void FindWindowPlacementAndResize([[maybe_unused]] int def_width, [[maybe_unused]] int def_height) override
 	{
 		Window::FindWindowPlacementAndResize(_toolbar_width, def_height);
 	}
@@ -2389,7 +2384,7 @@ struct ScenarioEditorToolbarWindow : Window {
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_TE_SPACER:
@@ -2403,7 +2398,7 @@ struct ScenarioEditorToolbarWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (_game_mode == GM_MENU) return;
 		CallBackFunction cbf = _scen_toolbar_button_procs[widget](this);
@@ -2450,7 +2445,7 @@ struct ScenarioEditorToolbarWindow : Window {
 		return ES_HANDLED;
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		switch (_last_started_action) {
 			case CBF_PLACE_SIGN:
@@ -2495,7 +2490,7 @@ struct ScenarioEditorToolbarWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		HandleZoomMessage(this, GetMainWindow()->viewport, WID_TE_ZOOM_IN, WID_TE_ZOOM_OUT);
diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index 8b17d4482d..cd912f28c7 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -155,9 +155,8 @@ Town::~Town()
 /**
  * Invalidating of the "nearest town cache" has to be done
  * after removing item from the pool.
- * @param index index of deleted item
  */
-void Town::PostDestructor(size_t index)
+void Town::PostDestructor(size_t)
 {
 	InvalidateWindowData(WC_TOWN_DIRECTORY, 0, TDIWD_FORCE_REBUILD);
 	UpdateNearestTownForRoadTiles(false);
@@ -306,7 +305,7 @@ static void DrawTile_Town(TileInfo *ti)
 	}
 }
 
-static int GetSlopePixelZ_Town(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Town(TileIndex tile, uint, uint, bool)
 {
 	return GetTileMaxPixelZ(tile);
 }
@@ -800,13 +799,13 @@ static void GetTileDesc_Town(TileIndex tile, TileDesc *td)
 	td->owner[0] = OWNER_TOWN;
 }
 
-static TrackStatus GetTileTrackStatus_Town(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Town(TileIndex, TransportType, uint, DiagDirection)
 {
 	/* not used */
 	return 0;
 }
 
-static void ChangeTileOwner_Town(TileIndex tile, Owner old_owner, Owner new_owner)
+static void ChangeTileOwner_Town(TileIndex, Owner, Owner)
 {
 	/* not used */
 }
@@ -2159,9 +2158,8 @@ static bool FindFurthestFromWater(TileIndex tile, void *user_data)
  * CircularTileSearch callback; finds the nearest land tile
  *
  * @param tile Start looking from this tile
- * @param user_data not used
  */
-static bool FindNearestEmptyLand(TileIndex tile, void *user_data)
+static bool FindNearestEmptyLand(TileIndex tile, void *)
 {
 	return IsTileType(tile, MP_CLEAR);
 }
@@ -2358,7 +2356,7 @@ static void MakeTownHouse(TileIndex t, Town *town, byte counter, byte stage, Hou
 	if (size & BUILDING_2_TILES_X)   ClearMakeHouseTile(t + TileDiffXY(1, 0), town, counter, stage, ++type, random_bits);
 	if (size & BUILDING_HAS_4_TILES) ClearMakeHouseTile(t + TileDiffXY(1, 1), town, counter, stage, ++type, random_bits);
 
-	ForAllStationsAroundTiles(TileArea(t, (size & BUILDING_2_TILES_X) ? 2 : 1, (size & BUILDING_2_TILES_Y) ? 2 : 1), [town](Station *st, TileIndex tile) {
+	ForAllStationsAroundTiles(TileArea(t, (size & BUILDING_2_TILES_X) ? 2 : 1, (size & BUILDING_2_TILES_Y) ? 2 : 1), [town](Station *st, TileIndex) {
 		town->stations_near.insert(st);
 		return true;
 	});
diff --git a/src/town_gui.cpp b/src/town_gui.cpp
index f66b0c7237..e2e76204d2 100644
--- a/src/town_gui.cpp
+++ b/src/town_gui.cpp
@@ -243,7 +243,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_TA_ACTION_INFO: {
@@ -275,7 +275,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_TA_ZONE_BUTTON: {
@@ -315,7 +315,7 @@ public:
 		this->SetDirty();
 	}};
 
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 
@@ -475,7 +475,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_TV_CENTER_VIEW: // scroll to location
@@ -518,7 +518,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_TV_INFO:
@@ -583,7 +583,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* Called when setting station noise or required cargoes have changed, in order to resize the window */
@@ -868,7 +868,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_TD_SORT_ORDER: {
@@ -920,7 +920,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_TD_SORT_ORDER: // Click on sort order button
@@ -998,7 +998,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		switch (data) {
 			case TDIWD_FORCE_REBUILD:
@@ -1046,7 +1046,7 @@ void ShowTownDirectory()
 	new TownDirectoryWindow(&_town_directory_desc);
 }
 
-void CcFoundTown(Commands cmd, const CommandCost &result, TileIndex tile)
+void CcFoundTown(Commands, const CommandCost &result, TileIndex tile)
 {
 	if (result.Failed()) return;
 
@@ -1054,7 +1054,7 @@ void CcFoundTown(Commands cmd, const CommandCost &result, TileIndex tile)
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
 }
 
-void CcFoundRandomTown(Commands cmd, const CommandCost &result, Money, TownID town_id)
+void CcFoundRandomTown(Commands, const CommandCost &result, Money, TownID town_id)
 {
 	if (result.Succeeded()) ScrollMainWindowToTile(Town::Get(town_id)->xy);
 }
@@ -1208,7 +1208,7 @@ public:
 		if (success && !_shift_pressed) this->RandomTownName();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_TF_NEW_TOWN:
@@ -1260,7 +1260,7 @@ public:
 		}
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		this->ExecuteFoundTownCommand(tile, false, STR_ERROR_CAN_T_FOUND_TOWN_HERE, CcFoundTown);
 	}
@@ -1276,7 +1276,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		this->UpdateButtons(true);
diff --git a/src/train_gui.cpp b/src/train_gui.cpp
index ebdfa29f0c..f8829688fd 100644
--- a/src/train_gui.cpp
+++ b/src/train_gui.cpp
@@ -22,12 +22,11 @@
 
 /**
  * Callback for building wagons.
- * @param cmd Unused.
  * @param result The result of the command.
  * @param new_veh_id ID of the ne vehicle.
  * @param tile   The tile the command was executed on.
  */
-void CcBuildWagon(Commands cmd, const CommandCost &result, VehicleID new_veh_id, uint, uint16_t, CargoArray, TileIndex tile, EngineID, bool, CargoID, ClientID)
+void CcBuildWagon(Commands, const CommandCost &result, VehicleID new_veh_id, uint, uint16_t, CargoArray, TileIndex tile, EngineID, bool, CargoID, ClientID)
 {
 	if (result.Failed()) return;
 
diff --git a/src/transparency_gui.cpp b/src/transparency_gui.cpp
index 6d998de96b..e15726e631 100644
--- a/src/transparency_gui.cpp
+++ b/src/transparency_gui.cpp
@@ -69,7 +69,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget >= WID_TT_BEGIN && widget < WID_TT_END) {
 			if (_ctrl_pressed) {
@@ -104,7 +104,7 @@ public:
 		}
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		Point pt = GetToolbarAlignedWindowPosition(sm_width);
 		pt.y += 2 * (sm_height - this->GetWidget<NWidgetBase>(WID_TT_BUTTONS)->current_y);
@@ -116,7 +116,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		for (uint i = WID_TT_BEGIN; i < WID_TT_END; i++) {
diff --git a/src/tree_cmd.cpp b/src/tree_cmd.cpp
index f5ad488eeb..e0dc5279bc 100644
--- a/src/tree_cmd.cpp
+++ b/src/tree_cmd.cpp
@@ -586,7 +586,7 @@ static void DrawTile_Trees(TileInfo *ti)
 }
 
 
-static int GetSlopePixelZ_Trees(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Trees(TileIndex tile, uint x, uint y, bool)
 {
 	int z;
 	Slope tileh = GetTilePixelSlope(tile, &z);
@@ -594,7 +594,7 @@ static int GetSlopePixelZ_Trees(TileIndex tile, uint x, uint y, bool ground_vehi
 	return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
 }
 
-static Foundation GetFoundation_Trees(TileIndex tile, Slope tileh)
+static Foundation GetFoundation_Trees(TileIndex, Slope)
 {
 	return FOUNDATION_NONE;
 }
@@ -864,12 +864,12 @@ void OnTick_Trees()
 	}
 }
 
-static TrackStatus GetTileTrackStatus_Trees(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Trees(TileIndex, TransportType, uint, DiagDirection)
 {
 	return 0;
 }
 
-static void ChangeTileOwner_Trees(TileIndex tile, Owner old_owner, Owner new_owner)
+static void ChangeTileOwner_Trees(TileIndex, Owner, Owner)
 {
 	/* not used */
 }
@@ -879,7 +879,7 @@ void InitializeTrees()
 	_trees_tick_ctr = 0;
 }
 
-static CommandCost TerraformTile_Trees(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
+static CommandCost TerraformTile_Trees(TileIndex tile, DoCommandFlag flags, int, Slope)
 {
 	return Command<CMD_LANDSCAPE_CLEAR>::Do(flags, tile);
 }
diff --git a/src/tree_gui.cpp b/src/tree_gui.cpp
index fb39ab7fd7..5ffadd5483 100644
--- a/src/tree_gui.cpp
+++ b/src/tree_gui.cpp
@@ -154,7 +154,7 @@ public:
 		}
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		if (widget >= WID_BT_TYPE_BUTTON_FIRST) {
 			/* Ensure tree type buttons are sized after the largest tree type */
@@ -173,7 +173,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_BT_TYPE_RANDOM: // tree of random type.
@@ -214,7 +214,7 @@ public:
 		}
 	}
 
-	void OnPlaceObject(Point pt, TileIndex tile) override
+	void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
 	{
 		if (_game_mode != GM_EDITOR && this->mode == PM_NORMAL) {
 			VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_PLANT_TREES);
@@ -223,7 +223,7 @@ public:
 		}
 	}
 
-	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
+	void OnPlaceDrag(ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) override
 	{
 		if (_game_mode != GM_EDITOR && this->mode == PM_NORMAL) {
 			VpSelectTilesWithMethod(pt.x, pt.y, select_method);
@@ -238,7 +238,7 @@ public:
 		}
 	}
 
-	void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) override
+	void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, TileIndex start_tile, TileIndex end_tile) override
 	{
 		if (_game_mode != GM_EDITOR && this->mode == PM_NORMAL && pt.x != -1 && select_proc == DDSP_PLANT_TREES) {
 			Command<CMD_PLANT_TREE>::Post(STR_ERROR_CAN_T_PLANT_TREE_HERE, end_tile, start_tile, this->tree_to_plant, _ctrl_pressed);
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index 901965f379..8a935dfb03 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -262,7 +262,7 @@ bool Vehicle::NeedsAutomaticServicing() const
 	return NeedsServicing();
 }
 
-uint Vehicle::Crash(bool flooded)
+uint Vehicle::Crash(bool)
 {
 	assert((this->vehstatus & VS_CRASHED) == 0);
 	assert(this->Previous() == nullptr); // IsPrimaryVehicle fails for free-wagon-chains
diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index a9a32deb4d..62de9a368a 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -462,13 +462,13 @@ public:
 	 * Sets the expense type associated to this vehicle type
 	 * @param income whether this is income or (running) expenses of the vehicle
 	 */
-	virtual ExpensesType GetExpenseType(bool income) const { return EXPENSES_OTHER; }
+	virtual ExpensesType GetExpenseType([[maybe_unused]] bool income) const { return EXPENSES_OTHER; }
 
 	/**
 	 * Play the sound associated with leaving the station
 	 * @param force Should we play the sound even if sound effects are muted? (horn hotkey)
 	 */
-	virtual void PlayLeaveStationSound(bool force = false) const {}
+	virtual void PlayLeaveStationSound([[maybe_unused]] bool force = false) const {}
 
 	/**
 	 * Whether this is the primary vehicle in the chain.
@@ -482,7 +482,7 @@ public:
 	 * @param direction the direction the vehicle is facing
 	 * @param[out] result Vehicle sprite sequence.
 	 */
-	virtual void GetImage(Direction direction, EngineImageType image_type, VehicleSpriteSeq *result) const { result->Clear(); }
+	virtual void GetImage([[maybe_unused]] Direction direction, [[maybe_unused]] EngineImageType image_type, [[maybe_unused]] VehicleSpriteSeq *result) const { result->Clear(); }
 
 	const GRFFile *GetGRF() const;
 	uint32_t GetGRFID() const;
@@ -782,7 +782,7 @@ public:
 	 * @param station the station to make the next location of the vehicle.
 	 * @return the location (tile) to aim for.
 	 */
-	virtual TileIndex GetOrderStationLocation(StationID station) { return INVALID_TILE; }
+	virtual TileIndex GetOrderStationLocation([[maybe_unused]] StationID station) { return INVALID_TILE; }
 
 	/**
 	 * Find the closest depot for this vehicle and tell us the location,
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index b1832826a8..017dd1b33f 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -884,7 +884,7 @@ struct RefitWindow : public Window {
 		this->DrawWidgets();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_VR_MATRIX:
@@ -1040,7 +1040,7 @@ struct RefitWindow : public Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		switch (data) {
 			case VIWD_AUTOREPLACE: // Autoreplace replaced the vehicle; selected_vehicle became invalid.
@@ -1148,7 +1148,7 @@ struct RefitWindow : public Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_VR_VEHICLE_PANEL_DISPLAY: { // Vehicle image.
@@ -1870,7 +1870,7 @@ public:
 		*this->sorting = this->vehgroups.GetListing();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_VL_LIST:
@@ -2019,7 +2019,7 @@ public:
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 		    case WID_VL_ORDER_VIEW: // Open the shared orders window
@@ -2163,7 +2163,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope && HasBit(data, 31) && this->vli.type == VL_SHARED_ORDERS) {
 			/* Needs to be done in command-scope, so everything stays valid */
@@ -2349,7 +2349,7 @@ struct VehicleDetailsWindow : Window {
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == VIWD_AUTOREPLACE) {
 			/* Autoreplace replaced the vehicle.
@@ -2389,7 +2389,7 @@ struct VehicleDetailsWindow : Window {
 		return desired_height;
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		switch (widget) {
 			case WID_VD_TOP_DETAILS: {
@@ -2626,7 +2626,7 @@ struct VehicleDetailsWindow : Window {
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_VD_INCREASE_SERVICING_INTERVAL:   // increase int
@@ -2808,11 +2808,10 @@ static const StringID _vehicle_msg_translation_table[][4] = {
 
 /**
  * This is the Callback method after attempting to start/stop a vehicle
- * @param cmd unused
  * @param result the result of the start/stop command
  * @param veh_id Vehicle ID.
  */
-void CcStartStopVehicle(Commands cmd, const CommandCost &result, VehicleID veh_id, bool)
+void CcStartStopVehicle(Commands, const CommandCost &result, VehicleID veh_id, bool)
 {
 	if (result.Failed()) return;
 
@@ -2950,7 +2949,7 @@ public:
 		this->Window::Close();
 	}
 
-	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
+	void UpdateWidgetSize(int widget, Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) override
 	{
 		const Vehicle *v = Vehicle::Get(this->window_number);
 		switch (widget) {
@@ -3111,7 +3110,7 @@ public:
 		DrawString(tr.left, tr.right, CenterBounds(tr.top, tr.bottom, FONT_HEIGHT_NORMAL), str, text_colour, SA_HOR_CENTER);
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		const Vehicle *v = Vehicle::Get(this->window_number);
 
@@ -3219,7 +3218,7 @@ public:
 		Command<CMD_RENAME_VEHICLE>::Post(STR_ERROR_CAN_T_RENAME_TRAIN + Vehicle::Get(this->window_number)->type, this->window_number, str);
 	}
 
-	void OnMouseOver(Point pt, int widget) override
+	void OnMouseOver([[maybe_unused]] Point pt, int widget) override
 	{
 		bool start_stop = widget == WID_VV_START_STOP;
 		if (start_stop != mouse_over_start_stop) {
@@ -3266,7 +3265,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (data == VIWD_AUTOREPLACE) {
 			/* Autoreplace replaced the vehicle.
@@ -3374,11 +3373,10 @@ void StopGlobalFollowVehicle(const Vehicle *v)
 
 /**
  * This is the Callback method after the construction attempt of a primary vehicle
- * @param cmd unused
  * @param result indicates completion (or not) of the operation
  * @param new_veh_id ID of the new vehicle.
  */
-void CcBuildPrimaryVehicle(Commands cmd, const CommandCost &result, VehicleID new_veh_id, uint, uint16_t, CargoArray)
+void CcBuildPrimaryVehicle(Commands, const CommandCost &result, VehicleID new_veh_id, uint, uint16_t, CargoArray)
 {
 	if (result.Failed()) return;
 
diff --git a/src/video/cocoa/cocoa_v.mm b/src/video/cocoa/cocoa_v.mm
index f94601813f..7129aae7e8 100644
--- a/src/video/cocoa/cocoa_v.mm
+++ b/src/video/cocoa/cocoa_v.mm
@@ -634,7 +634,7 @@ NSView *VideoDriver_CocoaQuartz::AllocateDrawView()
 }
 
 /** Resize the window. */
-void VideoDriver_CocoaQuartz::AllocateBackingStore(bool force)
+void VideoDriver_CocoaQuartz::AllocateBackingStore(bool)
 {
 	if (this->window == nil || this->cocoaview == nil || this->setup) return;
 
diff --git a/src/video/dedicated_v.cpp b/src/video/dedicated_v.cpp
index 9b17c060bf..f891be2402 100644
--- a/src/video/dedicated_v.cpp
+++ b/src/video/dedicated_v.cpp
@@ -103,7 +103,7 @@ extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, Detaile
 static FVideoDriver_Dedicated iFVideoDriver_Dedicated;
 
 
-const char *VideoDriver_Dedicated::Start(const StringList &parm)
+const char *VideoDriver_Dedicated::Start(const StringList &)
 {
 	this->UpdateAutoResolution();
 
@@ -140,9 +140,9 @@ void VideoDriver_Dedicated::Stop()
 	free(_dedicated_video_mem);
 }
 
-void VideoDriver_Dedicated::MakeDirty(int left, int top, int width, int height) {}
-bool VideoDriver_Dedicated::ChangeResolution(int w, int h) { return false; }
-bool VideoDriver_Dedicated::ToggleFullscreen(bool fs) { return false; }
+void VideoDriver_Dedicated::MakeDirty(int, int, int, int) {}
+bool VideoDriver_Dedicated::ChangeResolution(int, int) { return false; }
+bool VideoDriver_Dedicated::ToggleFullscreen(bool) { return false; }
 
 #if defined(UNIX)
 static bool InputWaiting()
diff --git a/src/video/null_v.cpp b/src/video/null_v.cpp
index 36947750a5..f0551e8898 100644
--- a/src/video/null_v.cpp
+++ b/src/video/null_v.cpp
@@ -42,7 +42,7 @@ const char *VideoDriver_Null::Start(const StringList &parm)
 
 void VideoDriver_Null::Stop() { }
 
-void VideoDriver_Null::MakeDirty(int left, int top, int width, int height) {}
+void VideoDriver_Null::MakeDirty(int, int, int, int) {}
 
 void VideoDriver_Null::MainLoop()
 {
@@ -61,6 +61,6 @@ void VideoDriver_Null::MainLoop()
 	}
 }
 
-bool VideoDriver_Null::ChangeResolution(int w, int h) { return false; }
+bool VideoDriver_Null::ChangeResolution(int, int) { return false; }
 
-bool VideoDriver_Null::ToggleFullscreen(bool fs) { return false; }
+bool VideoDriver_Null::ToggleFullscreen(bool) { return false; }
diff --git a/src/video/opengl.cpp b/src/video/opengl.cpp
index c9543319ff..1cbcda61af 100644
--- a/src/video/opengl.cpp
+++ b/src/video/opengl.cpp
@@ -405,7 +405,7 @@ static bool BindPersistentBufferExtensions()
 }
 
 /** Callback to receive OpenGL debug messages. */
-void APIENTRY DebugOutputCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)
+void APIENTRY DebugOutputCallback([[maybe_unused]] GLenum source, GLenum type, [[maybe_unused]] GLuint id, GLenum severity, [[maybe_unused]] GLsizei length, const GLchar *message, [[maybe_unused]] const void *userParam)
 {
 	/* Make severity human readable. */
 	const char *severity_str = "";
diff --git a/src/video/video_driver.hpp b/src/video/video_driver.hpp
index 25d47a1c72..32f1582e71 100644
--- a/src/video/video_driver.hpp
+++ b/src/video/video_driver.hpp
@@ -70,7 +70,7 @@ public:
 	 * Change the vsync setting.
 	 * @param vsync The new setting.
 	 */
-	virtual void ToggleVsync(bool vsync) {}
+	virtual void ToggleVsync([[maybe_unused]] bool vsync) {}
 
 	/**
 	 * Callback invoked after the blitter was changed.
diff --git a/src/video/win32_v.cpp b/src/video/win32_v.cpp
index cb92196d66..abaf45222e 100644
--- a/src/video/win32_v.cpp
+++ b/src/video/win32_v.cpp
@@ -934,7 +934,7 @@ void VideoDriver_Win32Base::EditBoxLostFocus()
 	SetCandidatePos(this->main_wnd);
 }
 
-static BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC hDC, LPRECT rc, LPARAM data)
+static BOOL CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC, LPRECT, LPARAM data)
 {
 	auto &list = *reinterpret_cast<std::vector<int>*>(data);
 
diff --git a/src/video/win32_v.h b/src/video/win32_v.h
index 14f1c6690b..8e9493df8f 100644
--- a/src/video/win32_v.h
+++ b/src/video/win32_v.h
@@ -157,7 +157,7 @@ protected:
 	bool AllocateBackingStore(int w, int h, bool force = false) override;
 	void *GetVideoPointer() override;
 	void ReleaseVideoPointer() override;
-	void PaletteChanged(HWND hWnd) override {}
+	void PaletteChanged(HWND) override {}
 
 	const char *AllocateContext();
 	void DestroyContext();
diff --git a/src/viewport_gui.cpp b/src/viewport_gui.cpp
index c81e4920f6..0c2b136afb 100644
--- a/src/viewport_gui.cpp
+++ b/src/viewport_gui.cpp
@@ -88,7 +88,7 @@ public:
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_EV_ZOOM_IN: DoZoomInOutWindow(ZOOM_IN,  this); break;
@@ -134,7 +134,7 @@ public:
 		this->viewport->dest_scrollpos_y = this->viewport->scrollpos_y;
 	}
 
-	bool OnRightClick(Point pt, int widget) override
+	bool OnRightClick([[maybe_unused]] Point pt, int widget) override
 	{
 		return widget == WID_EV_VIEWPORT;
 	}
@@ -151,7 +151,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* Only handle zoom message if intended for us (msg ZOOM_IN/ZOOM_OUT) */
diff --git a/src/void_cmd.cpp b/src/void_cmd.cpp
index 031d7a3a80..81dc9ed6c2 100644
--- a/src/void_cmd.cpp
+++ b/src/void_cmd.cpp
@@ -25,7 +25,7 @@ static void DrawTile_Void(TileInfo *ti)
 }
 
 
-static int GetSlopePixelZ_Void(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Void(TileIndex, uint x, uint y, bool)
 {
 	/* This function may be called on tiles outside the map, don't assume
 	 * that 'tile' is a valid tile index. See GetSlopePixelZOutsideMap. */
@@ -35,18 +35,18 @@ static int GetSlopePixelZ_Void(TileIndex tile, uint x, uint y, bool ground_vehic
 	return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
 }
 
-static Foundation GetFoundation_Void(TileIndex tile, Slope tileh)
+static Foundation GetFoundation_Void(TileIndex, Slope)
 {
 	return FOUNDATION_NONE;
 }
 
-static CommandCost ClearTile_Void(TileIndex tile, DoCommandFlag flags)
+static CommandCost ClearTile_Void(TileIndex, DoCommandFlag)
 {
 	return_cmd_error(STR_ERROR_OFF_EDGE_OF_MAP);
 }
 
 
-static void GetTileDesc_Void(TileIndex tile, TileDesc *td)
+static void GetTileDesc_Void(TileIndex, TileDesc *td)
 {
 	td->str = STR_EMPTY;
 	td->owner[0] = OWNER_NONE;
@@ -58,17 +58,17 @@ static void TileLoop_Void(TileIndex tile)
 	TileLoop_Water(tile);
 }
 
-static void ChangeTileOwner_Void(TileIndex tile, Owner old_owner, Owner new_owner)
+static void ChangeTileOwner_Void(TileIndex, Owner, Owner)
 {
 	/* not used */
 }
 
-static TrackStatus GetTileTrackStatus_Void(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Void(TileIndex, TransportType, uint, DiagDirection)
 {
 	return 0;
 }
 
-static CommandCost TerraformTile_Void(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
+static CommandCost TerraformTile_Void(TileIndex, DoCommandFlag, int, Slope)
 {
 	return_cmd_error(STR_ERROR_OFF_EDGE_OF_MAP);
 }
diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
index 41159d4e36..312f2452d2 100644
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -751,7 +751,7 @@ static void DrawWaterEdges(bool canal, uint offset, TileIndex tile)
 }
 
 /** Draw a plain sea water tile with no edges */
-static void DrawSeaWater(TileIndex tile)
+static void DrawSeaWater(TileIndex)
 {
 	DrawGroundSprite(SPR_FLAT_WATER_TILE, PAL_NONE);
 }
@@ -941,7 +941,7 @@ void DrawShipDepotSprite(int x, int y, Axis axis, DepotPart part)
 }
 
 
-static int GetSlopePixelZ_Water(TileIndex tile, uint x, uint y, bool ground_vehicle)
+static int GetSlopePixelZ_Water(TileIndex tile, uint x, uint y, bool)
 {
 	int z;
 	Slope tileh = GetTilePixelSlope(tile, &z);
@@ -949,7 +949,7 @@ static int GetSlopePixelZ_Water(TileIndex tile, uint x, uint y, bool ground_vehi
 	return z + GetPartialPixelZ(x & 0xF, y & 0xF, tileh);
 }
 
-static Foundation GetFoundation_Water(TileIndex tile, Slope tileh)
+static Foundation GetFoundation_Water(TileIndex, Slope)
 {
 	return FOUNDATION_NONE;
 }
@@ -1301,7 +1301,7 @@ void ConvertGroundTilesIntoWaterTiles()
 	}
 }
 
-static TrackStatus GetTileTrackStatus_Water(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
+static TrackStatus GetTileTrackStatus_Water(TileIndex tile, TransportType mode, uint, DiagDirection)
 {
 	static const TrackBits coast_tracks[] = {TRACK_BIT_NONE, TRACK_BIT_RIGHT, TRACK_BIT_UPPER, TRACK_BIT_NONE, TRACK_BIT_LEFT, TRACK_BIT_NONE, TRACK_BIT_NONE,
 		TRACK_BIT_NONE, TRACK_BIT_LOWER, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE};
@@ -1373,12 +1373,12 @@ static void ChangeTileOwner_Water(TileIndex tile, Owner old_owner, Owner new_own
 	}
 }
 
-static VehicleEnterTileStatus VehicleEnter_Water(Vehicle *v, TileIndex tile, int x, int y)
+static VehicleEnterTileStatus VehicleEnter_Water(Vehicle *, TileIndex, int, int)
 {
 	return VETSB_CONTINUE;
 }
 
-static CommandCost TerraformTile_Water(TileIndex tile, DoCommandFlag flags, int z_new, Slope tileh_new)
+static CommandCost TerraformTile_Water(TileIndex tile, DoCommandFlag flags, int, Slope)
 {
 	/* Canals can't be terraformed */
 	if (IsWaterTile(tile) && IsCanal(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_CANAL_FIRST);
diff --git a/src/waypoint_base.h b/src/waypoint_base.h
index 9abd77ae77..3ddbfc2d99 100644
--- a/src/waypoint_base.h
+++ b/src/waypoint_base.h
@@ -36,12 +36,12 @@ struct Waypoint FINAL : SpecializedStation<Waypoint, true> {
 
 	void GetTileArea(TileArea *ta, StationType type) const override;
 
-	uint GetPlatformLength(TileIndex tile, DiagDirection dir) const override
+	uint GetPlatformLength(TileIndex, DiagDirection) const override
 	{
 		return 1;
 	}
 
-	uint GetPlatformLength(TileIndex tile) const override
+	uint GetPlatformLength(TileIndex) const override
 	{
 		return 1;
 	}
diff --git a/src/waypoint_gui.cpp b/src/waypoint_gui.cpp
index d2042cf90e..4a296d9087 100644
--- a/src/waypoint_gui.cpp
+++ b/src/waypoint_gui.cpp
@@ -97,7 +97,7 @@ public:
 		this->DrawWidgets();
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		switch (widget) {
 			case WID_W_CENTER_VIEW: // scroll to location
@@ -128,7 +128,7 @@ public:
 	 * @param data Information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	void OnInvalidateData(int data = 0, bool gui_scope = true) override
+	void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
 	{
 		if (!gui_scope) return;
 		/* You can only change your own waypoints */
diff --git a/src/widget.cpp b/src/widget.cpp
index d5990c847b..a6a68ea919 100644
--- a/src/widget.cpp
+++ b/src/widget.cpp
@@ -1151,7 +1151,7 @@ bool NWidgetResizeBase::UpdateVerticalSize(uint min_y)
 	return true;
 }
 
-void NWidgetResizeBase::AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl)
+void NWidgetResizeBase::AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool)
 {
 	this->StoreSizePosition(sizing, x, y, given_width, given_height);
 }
@@ -1663,7 +1663,7 @@ NWidgetHorizontalLTR::NWidgetHorizontalLTR(NWidContainerFlags flags) : NWidgetHo
 	this->type = NWID_HORIZONTAL_LTR;
 }
 
-void NWidgetHorizontalLTR::AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl)
+void NWidgetHorizontalLTR::AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool)
 {
 	NWidgetHorizontal::AssignSizePosition(sizing, x, y, given_width, given_height, false);
 }
@@ -1839,27 +1839,27 @@ NWidgetSpacer::NWidgetSpacer(int width, int height) : NWidgetResizeBase(NWID_SPA
 	this->SetResize(0, 0);
 }
 
-void NWidgetSpacer::SetupSmallestSize(Window *w, bool init_array)
+void NWidgetSpacer::SetupSmallestSize(Window *, bool)
 {
 	this->smallest_x = this->min_x;
 	this->smallest_y = this->min_y;
 }
 
-void NWidgetSpacer::FillNestedArray(NWidgetBase **array, uint length)
+void NWidgetSpacer::FillNestedArray(NWidgetBase **, uint)
 {
 }
 
-void NWidgetSpacer::Draw(const Window *w)
+void NWidgetSpacer::Draw(const Window *)
 {
 	/* Spacer widget is never visible. */
 }
 
-void NWidgetSpacer::SetDirty(const Window *w) const
+void NWidgetSpacer::SetDirty(const Window *) const
 {
 	/* Spacer widget never need repainting. */
 }
 
-NWidgetCore *NWidgetSpacer::GetWidgetFromPos(int x, int y)
+NWidgetCore *NWidgetSpacer::GetWidgetFromPos(int, int)
 {
 	return nullptr;
 }
@@ -1959,7 +1959,7 @@ void NWidgetMatrix::SetupSmallestSize(Window *w, bool init_array)
 	this->resize_y = resize.height;
 }
 
-void NWidgetMatrix::AssignSizePosition(SizingType sizing, uint x, uint y, uint given_width, uint given_height, bool rtl)
+void NWidgetMatrix::AssignSizePosition(SizingType, uint x, uint y, uint given_width, uint given_height, bool)
 {
 	assert(given_width >= this->smallest_x && given_height >= this->smallest_y);
 
diff --git a/src/widget_type.h b/src/widget_type.h
index ffa8980111..9191d1cfa6 100644
--- a/src/widget_type.h
+++ b/src/widget_type.h
@@ -136,7 +136,7 @@ public:
 
 	virtual bool IsHighlighted() const { return false; }
 	virtual TextColour GetHighlightColour() const { return TC_INVALID; }
-	virtual void SetHighlighted(TextColour highlight_colour) {}
+	virtual void SetHighlighted([[maybe_unused]] TextColour highlight_colour) {}
 
 	/**
 	 * Set additional space (padding) around the widget.
diff --git a/src/widgets/dropdown.cpp b/src/widgets/dropdown.cpp
index 137c375dcb..af1c4e2f19 100644
--- a/src/widgets/dropdown.cpp
+++ b/src/widgets/dropdown.cpp
@@ -22,7 +22,7 @@
 #include "../safeguards.h"
 
 
-void DropDownListItem::Draw(const Rect &r, bool sel, Colours bg_colour) const
+void DropDownListItem::Draw(const Rect &r, bool, Colours bg_colour) const
 {
 	int c1 = _colour_gradient[bg_colour][3];
 	int c2 = _colour_gradient[bg_colour][7];
@@ -41,7 +41,7 @@ uint DropDownListStringItem::Width() const
 	return GetStringBoundingBox(this->String()).width + WidgetDimensions::scaled.dropdowntext.Horizontal();
 }
 
-void DropDownListStringItem::Draw(const Rect &r, bool sel, Colours bg_colour) const
+void DropDownListStringItem::Draw(const Rect &r, bool sel, Colours) const
 {
 	Rect ir = r.Shrink(WidgetDimensions::scaled.dropdowntext);
 	DrawString(ir.left, ir.right, r.top, this->String(), sel ? TC_WHITE : TC_BLACK);
@@ -67,7 +67,7 @@ DropDownListIconItem::DropDownListIconItem(SpriteID sprite, PaletteID pal, Strin
 	this->sprite_y = dim.height;
 }
 
-uint DropDownListIconItem::Height(uint width) const
+uint DropDownListIconItem::Height(uint) const
 {
 	return std::max(this->dim.height, (uint)FONT_HEIGHT_NORMAL);
 }
@@ -77,7 +77,7 @@ uint DropDownListIconItem::Width() const
 	return DropDownListStringItem::Width() + this->dim.width + WidgetDimensions::scaled.hsep_wide;
 }
 
-void DropDownListIconItem::Draw(const Rect &r, bool sel, Colours bg_colour) const
+void DropDownListIconItem::Draw(const Rect &r, bool sel, Colours) const
 {
 	bool rtl = _current_text_dir == TD_RTL;
 	Rect ir = r.Shrink(WidgetDimensions::scaled.dropdowntext);
@@ -197,7 +197,7 @@ struct DropdownWindow : Window {
 		}
 	}
 
-	Point OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number) override
+	Point OnInitialPosition([[maybe_unused]] int16_t sm_width, [[maybe_unused]] int16_t sm_height, [[maybe_unused]] int window_number) override
 	{
 		return this->position;
 	}
@@ -263,7 +263,7 @@ struct DropdownWindow : Window {
 		}
 	}
 
-	void OnClick(Point pt, int widget, int click_count) override
+	void OnClick([[maybe_unused]] Point pt, int widget, [[maybe_unused]] int click_count) override
 	{
 		if (widget != WID_DM_ITEMS) return;
 		int item;
diff --git a/src/widgets/dropdown_type.h b/src/widgets/dropdown_type.h
index bfb3f57fec..9f3cc11bb2 100644
--- a/src/widgets/dropdown_type.h
+++ b/src/widgets/dropdown_type.h
@@ -27,7 +27,7 @@ public:
 	virtual ~DropDownListItem() = default;
 
 	virtual bool Selectable() const { return false; }
-	virtual uint Height(uint width) const { return FONT_HEIGHT_NORMAL; }
+	virtual uint Height([[maybe_unused]] uint) const { return FONT_HEIGHT_NORMAL; }
 	virtual uint Width() const { return 0; }
 	virtual void Draw(const Rect &r, bool sel, Colours bg_colour) const;
 };
diff --git a/src/window.cpp b/src/window.cpp
index 4c6643f92e..bcc86c661e 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -518,7 +518,7 @@ void Window::OnFocus()
 /**
  * Called when window loses focus
  */
-void Window::OnFocusLost(bool closing)
+void Window::OnFocusLost(bool)
 {
 	if (this->nested_focus != nullptr && this->nested_focus->type == WWT_EDITBOX) VideoDriver::GetInstance()->EditBoxLostFocus();
 }
@@ -1716,7 +1716,7 @@ static Point LocalGetWindowPlacement(const WindowDesc *desc, int16_t sm_width, i
 	return pt;
 }
 
-/* virtual */ Point Window::OnInitialPosition(int16_t sm_width, int16_t sm_height, int window_number)
+/* virtual */ Point Window::OnInitialPosition([[maybe_unused]]int16_t sm_width, [[maybe_unused]]int16_t sm_height, [[maybe_unused]]int window_number)
 {
 	return LocalGetWindowPlacement(this->window_desc, sm_width, sm_height, window_number);
 }
diff --git a/src/window_gui.h b/src/window_gui.h
index 03f251a52b..26b8dfb2c4 100644
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -540,7 +540,7 @@ public:
 	 * @param widget Number of the widget to draw.
 	 * @note This method may not change any state, it may only use drawing functions.
 	 */
-	virtual void DrawWidget(const Rect &r, int widget) const {}
+	virtual void DrawWidget([[maybe_unused]] const Rect &r, [[maybe_unused]] int widget) const {}
 
 	/**
 	 * Update size and resize step of a widget in the window.
@@ -554,7 +554,7 @@ public:
 	 * @param fill    Fill step of the widget.
 	 * @param resize  Resize step of the widget.
 	 */
-	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) {}
+	virtual void UpdateWidgetSize([[maybe_unused]] int widget, [[maybe_unused]] Dimension *size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension *fill, [[maybe_unused]] Dimension *resize) {}
 
 	/**
 	 * Initialize string parameters for a widget.
@@ -562,7 +562,7 @@ public:
 	 * and while re-initializing the window. Only for widgets that render text initializing is requested.
 	 * @param widget  Widget number.
 	 */
-	virtual void SetStringParameters(int widget) const {}
+	virtual void SetStringParameters([[maybe_unused]] int widget) const {}
 
 	/**
 	 * The window has gained focus.
@@ -582,7 +582,7 @@ public:
 	 * @return #ES_HANDLED if the key press has been handled and no other
 	 *         window should receive the event.
 	 */
-	virtual EventState OnKeyPress(char32_t key, uint16_t keycode) { return ES_NOT_HANDLED; }
+	virtual EventState OnKeyPress([[maybe_unused]] char32_t key, [[maybe_unused]] uint16_t keycode) { return ES_NOT_HANDLED; }
 
 	virtual EventState OnHotkey(int hotkey);
 
@@ -600,7 +600,7 @@ public:
 	 * @param widget the clicked widget.
 	 * @param click_count Number of fast consecutive clicks at same position
 	 */
-	virtual void OnClick(Point pt, int widget, int click_count) {}
+	virtual void OnClick([[maybe_unused]] Point pt, [[maybe_unused]] int widget, [[maybe_unused]] int click_count) {}
 
 	/**
 	 * A click with the right mouse button has been made on the window.
@@ -609,14 +609,14 @@ public:
 	 * @return true if the click was actually handled, i.e. do not show a
 	 *         tooltip if tooltip-on-right-click is enabled.
 	 */
-	virtual bool OnRightClick(Point pt, int widget) { return false; }
+	virtual bool OnRightClick([[maybe_unused]] Point pt, [[maybe_unused]] int widget) { return false; }
 
 	/**
 	 * The mouse is hovering over a widget in the window, perform an action for it.
 	 * @param pt     The point where the mouse is hovering.
 	 * @param widget The widget where the mouse is hovering.
 	 */
-	virtual void OnHover(Point pt, int widget) {}
+	virtual void OnHover([[maybe_unused]] Point pt, [[maybe_unused]] int widget) {}
 
 	/**
 	 * Event to display a custom tooltip.
@@ -624,27 +624,27 @@ public:
 	 * @param widget The widget where the mouse is located.
 	 * @return True if the event is handled, false if it is ignored.
 	 */
-	virtual bool OnTooltip(Point pt, int widget, TooltipCloseCondition close_cond) { return false; }
+	virtual bool OnTooltip([[maybe_unused]] Point pt, [[maybe_unused]] int widget, [[maybe_unused]] TooltipCloseCondition close_cond) { return false; }
 
 	/**
 	 * An 'object' is being dragged at the provided position, highlight the target if possible.
 	 * @param pt     The point inside the window that the mouse hovers over.
 	 * @param widget The widget the mouse hovers over.
 	 */
-	virtual void OnMouseDrag(Point pt, int widget) {}
+	virtual void OnMouseDrag([[maybe_unused]] Point pt, [[maybe_unused]] int widget) {}
 
 	/**
 	 * A dragged 'object' has been released.
 	 * @param pt     the point inside the window where the release took place.
 	 * @param widget the widget where the release took place.
 	 */
-	virtual void OnDragDrop(Point pt, int widget) {}
+	virtual void OnDragDrop([[maybe_unused]] Point pt, [[maybe_unused]] int widget) {}
 
 	/**
 	 * Handle the request for (viewport) scrolling.
 	 * @param delta the amount the viewport must be scrolled.
 	 */
-	virtual void OnScroll(Point delta) {}
+	virtual void OnScroll([[maybe_unused]] Point delta) {}
 
 	/**
 	 * The mouse is currently moving over the window or has just moved outside
@@ -652,13 +652,13 @@ public:
 	 * @param pt     the point inside the window that the mouse hovers over.
 	 * @param widget the widget the mouse hovers over.
 	 */
-	virtual void OnMouseOver(Point pt, int widget) {}
+	virtual void OnMouseOver([[maybe_unused]] Point pt, [[maybe_unused]] int widget) {}
 
 	/**
 	 * The mouse wheel has been turned.
 	 * @param wheel the amount of movement of the mouse wheel.
 	 */
-	virtual void OnMouseWheel(int wheel) {}
+	virtual void OnMouseWheel([[maybe_unused]] int wheel) {}
 
 
 	/**
@@ -674,7 +674,7 @@ public:
 	/**
 	 * Called periodically.
 	 */
-	virtual void OnRealtimeTick(uint delta_ms) {}
+	virtual void OnRealtimeTick([[maybe_unused]] uint delta_ms) {}
 
 	/**
 	 * Called when this window's timeout has been reached.
@@ -693,7 +693,7 @@ public:
 	 * @param widget the widget (button) that the dropdown is associated with.
 	 * @param index  the element in the dropdown that is selected.
 	 */
-	virtual void OnDropdownSelect(int widget, int index) {}
+	virtual void OnDropdownSelect([[maybe_unused]] int widget, [[maybe_unused]] int index) {}
 
 	virtual void OnDropdownClose(Point pt, int widget, int index, bool instant_close);
 
@@ -701,7 +701,7 @@ public:
 	 * The text in an editbox has been edited.
 	 * @param widget The widget of the editbox.
 	 */
-	virtual void OnEditboxChanged(int widget) {}
+	virtual void OnEditboxChanged([[maybe_unused]] int widget) {}
 
 	/**
 	 * The query window opened from this window has closed.
@@ -709,14 +709,14 @@ public:
 	 *            was cancelled or an empty string when the default
 	 *            button was pressed, i.e. StrEmpty(str).
 	 */
-	virtual void OnQueryTextFinished(char *str) {}
+	virtual void OnQueryTextFinished([[maybe_unused]] char *str) {}
 
 	/**
 	 * Some data on this window has become invalid.
 	 * @param data information about the changed data.
 	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 	 */
-	virtual void OnInvalidateData(int data = 0, bool gui_scope = true) {}
+	virtual void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) {}
 
 	/**
 	 * The user clicked some place on the map when a tile highlight mode
@@ -724,7 +724,7 @@ public:
 	 * @param pt   the exact point on the map that has been clicked.
 	 * @param tile the tile on the map that has been clicked.
 	 */
-	virtual void OnPlaceObject(Point pt, TileIndex tile) {}
+	virtual void OnPlaceObject([[maybe_unused]] Point pt, [[maybe_unused]] TileIndex tile) {}
 
 	/**
 	 * The user clicked on a vehicle while HT_VEHICLE has been set.
@@ -732,7 +732,7 @@ public:
 	 * @return true if the click is handled, false if it is ignored
 	 * @pre v->IsPrimaryVehicle() == true
 	 */
-	virtual bool OnVehicleSelect(const struct Vehicle *v) { return false; }
+	virtual bool OnVehicleSelect([[maybe_unused]] const struct Vehicle *v) { return false; }
 
 	/**
 	 * The user clicked on a vehicle while HT_VEHICLE has been set.
@@ -740,7 +740,7 @@ public:
 	 * @return True if the click is handled, false if it is ignored
 	 * @pre v->IsPrimaryVehicle() == true
 	 */
-	virtual bool OnVehicleSelect(VehicleList::const_iterator begin, VehicleList::const_iterator end) { return false; }
+	virtual bool OnVehicleSelect([[maybe_unused]] VehicleList::const_iterator begin, [[maybe_unused]] VehicleList::const_iterator end) { return false; }
 
 	/**
 	 * The user cancelled a tile highlight mode that has been set.
@@ -755,7 +755,7 @@ public:
 	 * @param select_proc   what will be created when the drag is over.
 	 * @param pt            the exact point on the map where the mouse is.
 	 */
-	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) {}
+	virtual void OnPlaceDrag([[maybe_unused]] ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt) {}
 
 	/**
 	 * The user has dragged over the map when the tile highlight mode
@@ -766,7 +766,7 @@ public:
 	 * @param start_tile    the begin tile of the drag.
 	 * @param end_tile      the end tile of the drag.
 	 */
-	virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) {}
+	virtual void OnPlaceMouseUp([[maybe_unused]] ViewportPlaceMethod select_method, [[maybe_unused]] ViewportDragDropSelectionProcess select_proc, [[maybe_unused]] Point pt, [[maybe_unused]] TileIndex start_tile, [[maybe_unused]] TileIndex end_tile) {}
 
 	/**
 	 * The user moves over the map when a tile highlight mode has been set
@@ -775,7 +775,7 @@ public:
 	 * @param pt   the exact point on the map where the mouse is.
 	 * @param tile the tile on the map where the mouse is.
 	 */
-	virtual void OnPlacePresize(Point pt, TileIndex tile) {}
+	virtual void OnPlacePresize([[maybe_unused]] Point pt, [[maybe_unused]] TileIndex tile) {}
 
 	/*** End of the event handling ***/