ref: 0e99e773378bda3b08a3f2ec5168a77c3a20bfda
dir: /external/SDL2/sdl2.m4/
# Configure paths for SDL
# Sam Lantinga 9/21/99
# stolen from Manish Singh
# stolen back from Frank Belew
# stolen from Manish Singh
# Shamelessly stolen from Owen Taylor
#
# Changelog:
# * also look for SDL2.framework under Mac OS X
# serial 1
dnl AM_PATH_SDL2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
dnl
AC_DEFUN([AM_PATH_SDL2],
[dnl
dnl Get the cflags and libraries from the sdl2-config script
dnl
AC_ARG_WITH(sdl-prefix,[ --with-sdl-prefix=PFX Prefix where SDL is installed (optional)],
sdl_prefix="$withval", sdl_prefix="")
AC_ARG_WITH(sdl-exec-prefix,[ --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
sdl_exec_prefix="$withval", sdl_exec_prefix="")
AC_ARG_ENABLE(sdltest, [ --disable-sdltest Do not try to compile and run a test SDL program],
, enable_sdltest=yes)
AC_ARG_ENABLE(sdlframework, [ --disable-sdlframework Do not search for SDL2.framework],
, search_sdl_framework=yes)
AC_ARG_VAR(SDL2_FRAMEWORK, [Path to SDL2.framework])
min_sdl_version=ifelse([$1], ,2.0.0,$1)
if test "x$sdl_prefix$sdl_exec_prefix" = x ; then
PKG_CHECK_MODULES([SDL], [sdl2 >= $min_sdl_version],
[sdl_pc=yes],
[sdl_pc=no])
else
sdl_pc=no
if test x$sdl_exec_prefix != x ; then
sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
if test x${SDL2_CONFIG+set} != xset ; then
SDL2_CONFIG=$sdl_exec_prefix/bin/sdl2-config
fi
fi
if test x$sdl_prefix != x ; then
sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
if test x${SDL2_CONFIG+set} != xset ; then
SDL2_CONFIG=$sdl_prefix/bin/sdl2-config
fi
fi
fi
if test "x$sdl_pc" = xyes ; then
no_sdl=""
SDL2_CONFIG="pkg-config sdl2"
else
as_save_PATH="$PATH"
if test "x$prefix" != xNONE && test "$cross_compiling" != yes; then
PATH="$prefix/bin:$prefix/usr/bin:$PATH"
fi
AC_PATH_PROG(SDL2_CONFIG, sdl2-config, no, [$PATH])
PATH="$as_save_PATH"
no_sdl=""
if test "$SDL2_CONFIG" = "no" -a "x$search_sdl_framework" = "xyes"; then
AC_MSG_CHECKING(for SDL2.framework)
if test "x$SDL2_FRAMEWORK" != x; then
sdl_framework=$SDL2_FRAMEWORK
else
for d in / ~/ /System/; do
if test -d "$dLibrary/Frameworks/SDL2.framework"; then
sdl_framework="$dLibrary/Frameworks/SDL2.framework"
fi
done
fi
if test -d $sdl_framework; then
AC_MSG_RESULT($sdl_framework)
sdl_framework_dir=`dirname $sdl_framework`
SDL_CFLAGS="-F$sdl_framework_dir -Wl,-framework,SDL2 -I$sdl_framework/include"
SDL_LIBS="-F$sdl_framework_dir -Wl,-framework,SDL2"
else
no_sdl=yes
fi
fi
if test "$SDL2_CONFIG" != "no"; then
if test "x$sdl_pc" = "xno"; then
AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
SDL_CFLAGS=`$SDL2_CONFIG $sdl_config_args --cflags`
SDL_LIBS=`$SDL2_CONFIG $sdl_config_args --libs`
fi
sdl_major_version=`$SDL2_CONFIG $sdl_config_args --version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
sdl_minor_version=`$SDL2_CONFIG $sdl_config_args --version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
sdl_micro_version=`$SDL2_CONFIG $sdl_config_args --version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
if test "x$enable_sdltest" = "xyes" ; then
ac_save_CFLAGS="$CFLAGS"
ac_save_CXXFLAGS="$CXXFLAGS"
ac_save_LIBS="$LIBS"
CFLAGS="$CFLAGS $SDL_CFLAGS"
CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
LIBS="$LIBS $SDL_LIBS"
dnl
dnl Now check if the installed SDL is sufficiently new. (Also sanity
dnl checks the results of sdl2-config to some extent
dnl
rm -f conf.sdltest
AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
char*
my_strdup (char *str)
{
char *new_str;
if (str)
{
new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
strcpy (new_str, str);
}
else
new_str = NULL;
return new_str;
}
int main (int argc, char *argv[])
{
int major, minor, micro;
char *tmp_version;
/* This hangs on some systems (?)
system ("touch conf.sdltest");
*/
{ FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
/* HP/UX 9 (%@#!) writes to sscanf strings */
tmp_version = my_strdup("$min_sdl_version");
if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, µ) != 3) {
printf("%s, bad version string\n", "$min_sdl_version");
exit(1);
}
if (($sdl_major_version > major) ||
(($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
(($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
{
return 0;
}
else
{
printf("\n*** 'sdl2-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
printf("*** of SDL required is %d.%d.%d. If sdl2-config is correct, then it is\n", major, minor, micro);
printf("*** best to upgrade to the required version.\n");
printf("*** If sdl2-config was wrong, set the environment variable SDL2_CONFIG\n");
printf("*** to point to the correct copy of sdl2-config, and remove the file\n");
printf("*** config.cache before re-running configure\n");
return 1;
}
}
],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
CFLAGS="$ac_save_CFLAGS"
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
fi
if test "x$sdl_pc" = "xno"; then
if test "x$no_sdl" = "xyes"; then
AC_MSG_RESULT(no)
else
AC_MSG_RESULT(yes)
fi
fi
fi
fi
if test "x$no_sdl" = x ; then
ifelse([$2], , :, [$2])
else
if test "$SDL2_CONFIG" = "no" ; then
echo "*** The sdl2-config script installed by SDL could not be found"
echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
echo "*** your path, or set the SDL2_CONFIG environment variable to the"
echo "*** full path to sdl2-config."
else
if test -f conf.sdltest ; then
:
else
echo "*** Could not run SDL test program, checking why..."
CFLAGS="$CFLAGS $SDL_CFLAGS"
CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
LIBS="$LIBS $SDL_LIBS"
AC_TRY_LINK([
#include <stdio.h>
#include "SDL.h"
int main(int argc, char *argv[])
{ return 0; }
#undef main
#define main K_and_R_C_main
], [ return 0; ],
[ echo "*** The test program compiled, but did not run. This usually means"
echo "*** that the run-time linker is not finding SDL or finding the wrong"
echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
echo "*** to the installed location Also, make sure you have run ldconfig if that"
echo "*** is required on your system"
echo "***"
echo "*** If you have an old version installed, it is best to remove it, although"
echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
[ echo "*** The test program failed to compile or link. See the file config.log for the"
echo "*** exact error that occured. This usually means SDL was incorrectly installed"
echo "*** or that you have moved SDL since it was installed. In the latter case, you"
echo "*** may want to edit the sdl2-config script: $SDL2_CONFIG" ])
CFLAGS="$ac_save_CFLAGS"
CXXFLAGS="$ac_save_CXXFLAGS"
LIBS="$ac_save_LIBS"
fi
fi
SDL_CFLAGS=""
SDL_LIBS=""
ifelse([$3], , :, [$3])
fi
AC_SUBST(SDL_CFLAGS)
AC_SUBST(SDL_LIBS)
rm -f conf.sdltest
])