Pass linker option to compress debug sections. Only enable this for
Travis, as spending additional cycles on it in development would not be
desirable.
This uses GCC's pass-through to linker instead of what should really be
`-gz` because of Ubuntu's outdated versions.
This (partially) addresses
https://github.com/OpenRCT2/OpenRCT2/issues/6232.
This moves setting of compilation flags to common file to be used by all
subprojects and explicitly enables only C++ support, skipping whole C
support in CMake.
While looking at
https://github.com/OpenRCT2/OpenRCT2/issues/7176#issuecomment-365399194
I got a crash with stacktrace:
#0 0x7f9e81fa2e30 in object_entry_get_entry(int, unsigned long) ../src/openrct2/object/ObjectList.cpp:181
#1 0x7f9e81fa24ae in get_loaded_object_entry(unsigned long) ../src/openrct2/object/ObjectList.cpp:142
#2 0x7f9e8215d64f in S6Exporter::Export() ../src/openrct2/rct2/S6Exporter.cpp:169
#3 0x7f9e8216de71 in scenario_save(char const*, int) ../src/openrct2/rct2/S6Exporter.cpp:757
#4 0x7f9e81c932b0 in game_autosave() ../src/openrct2/Game.cpp:1590
#5 0x7f9e828625b6 in scenario_autosave_check() ../src/openrct2/scenario/Scenario.cpp:297
#6 0x7f9e81c8a958 in game_update() ../src/openrct2/Game.cpp:439
#7 0x7f9e81c6731f in OpenRCT2::Context::Update() (/home/janisozaur/workspace/OpenRCT2/build/libopenrct2.so+0x10f331f)
#8 0x7f9e81c6674c in OpenRCT2::Context::RunVariableFrame() (/home/janisozaur/workspace/OpenRCT2/build/libopenrct2.so+0x10f274c)
#9 0x7f9e81c6402d in OpenRCT2::Context::RunFrame() (/home/janisozaur/workspace/OpenRCT2/build/libopenrct2.so+0x10f002d)
#10 0x7f9e81c638f4 in OpenRCT2::Context::RunGameLoop() (/home/janisozaur/workspace/OpenRCT2/build/libopenrct2.so+0x10ef8f4)
#11 0x7f9e81c627bf in OpenRCT2::Context::Launch() (/home/janisozaur/workspace/OpenRCT2/build/libopenrct2.so+0x10ee7bf)
#12 0x7f9e81c5b08a in OpenRCT2::Context::RunOpenRCT2(int, char const**) ../src/openrct2/Context.cpp:170
#13 0x56323695b95e in main ../src/openrct2-ui/Ui.cpp:60
Sadly I cannot reproduce it anymore
`typedef struct/union/enum name { ... } name_again;` is not needed whe compiling C++, moving the name at the back to be in front of the object and removing `typedef` makes it usable the very same way.
This also replaces typedefs with the using keyword. They have better readability, especially for function pointer types, and would allow more flexibility when used with templates.
