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(svn r158) -Fix: make endianess check 100% accurate (hopefully ;))

This commit is contained in:
truelight 2004-09-04 14:20:12 +00:00
parent 85628544ee
commit 0fe07eac63
3 changed files with 38 additions and 23 deletions
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14
Makefile
View File

@ -171,6 +171,7 @@ endif
# Set output executable names
TTD=openttd$(EXE)
ENDIAN_CHECK=endian_check$(EXE)
STRGEN=strgen/strgen$(EXE)
OSXAPP="OpenTTD.app"
@ -198,7 +199,7 @@ BUILDDATE=`date +%d.%m.%y`
ifeq ($(shell uname -m), x86_64)
endwarnings:=endwarnings
64_bit_warnings:=64_bit_warnings
BASECFLAGS += -m64 -D_LITTLE_ENDIAN
BASECFLAGS += -m64
endif
@ -488,8 +489,15 @@ OSX:=OSX
endif
all: $(UPDATECONFIG) $(TTD) $(OSX) $(endwarnings)
all: endian.h $(UPDATECONFIG) $(TTD) $(OSX) $(endwarnings)
endian.h: $(ENDIAN_CHECK)
# Check if system is LITTLE_ENDIAN or BIG_ENDIAN
./$(ENDIAN_CHECK) > $@
$(ENDIAN_CHECK): endian_check.c
$(CC) $(BASECFLAGS) $(CDEFS) endian_check.c -o $@
$(TTD): table/strings.h $(ttd_OBJS) $(LANGS) $(MAKE_CONFIG)
$(C_LINK) $@ $(TTDLDFLAGS) $(ttd_OBJS) $(LIBS)
@ -546,7 +554,7 @@ FORCE:
# ttd$(EXE) is removed just to make sure people execute the right binary (openttd$(EXE))
# remove this for next release!
clean:
rm -rf .deps *~ $(TTD) $(STRGEN) core table/strings.h $(LANGS) $(ttd_OBJS) ttd$(EXE)
rm -rf .deps *~ $(TTD) $(STRGEN) core table/strings.h $(LANGS) $(ttd_OBJS) endian.h $(ENDIAN_CHECK) ttd$(EXE)
mrproper: clean
rm -rf $(MAKE_CONFIG)

22
endian_check.c Normal file
View File

@ -0,0 +1,22 @@
#include <stdio.h>
// This pretty simple file checks if the system is LITTLE_ENDIAN or BIG_ENDIAN
// it does that by putting a 1 and a 0 in an array, and read it out as one
// number. If it is 1, it is LITTLE_ENDIAN, if it is 256, it is BIG_ENDINA
//
// After that it outputs the contents of an include files (endian.h)
// that says or TTD_LITTLE_ENDIAN, or TTD_BIG_ENDIAN. Makefile takes
// care of the real writing to the file.
int main () {
unsigned char EndianTest[2] = { 1, 0 };
printf("#ifndef ENDIAN_H\n#define ENDIAN_H\n");
if( *(short *) EndianTest == 1 )
printf("#define TTD_LITTLE_ENDIAN\n");
else
printf("#define TTD_BIG_ENDIAN\n");
printf("#endif\n");
return 0;
}

25
stdafx.h
View File

@ -67,27 +67,12 @@
# define GCC_PACK
#endif
// Windows has always LITTLE_ENDIAN
#if defined(WIN32)
# define TTD_LITTLE_ENDIAN
#endif
#if defined(i386)
# define TTD_LITTLE_ENDIAN
#endif
#if defined(__MORPHOS__)
# define TTD_BIG_ENDIAN
#endif
// Check endianness
#if !defined(TTD_LITTLE_ENDIAN) && !defined(TTD_BIG_ENDIAN)
# if defined(_BIG_ENDIAN)
# define TTD_BIG_ENDIAN
# elif defined(_LITTLE_ENDIAN)
# define TTD_LITTLE_ENDIAN
# else
# error No endianness defined, use either TTD_LITTLE_ENDIAN or TTD_BIG_ENDIAN
#endif
#define TTD_LITTLE_ENDIAN
#else
// Else include endian.h, which has the endian-type, autodetected by the Makefile
#include "endian.h"
#endif
#if defined(UNIX)