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sdl2.m4
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‎m4/sdl2.m4

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

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