dnl AM_PATH_SDL([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_SDL],

[dnl

dnl Get the cflags and libraries from the sdl-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)

if test x$sdl_exec_prefix != x ; then

sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix"

if test x${SDL_CONFIG+set} != xset ; then

SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config

fi

fi

if test x$sdl_prefix != x ; then

sdl_args="$sdl_args --prefix=$sdl_prefix"

if test x${SDL_CONFIG+set} != xset ; then

SDL_CONFIG=$sdl_prefix/bin/sdl-config

fi

fi

AC_REQUIRE([AC_CANONICAL_TARGET])

PATH="$prefix/bin:$prefix/usr/bin:$PATH"

AC_PATH_PROG(SDL1_CONFIG, sdl-config, no, [$PATH])

AC_PATH_PROG(SDL2_CONFIG, sdl2-config, no, [$PATH])

if test "$SDL2_CONFIG" != "no" ; then

SDL_CONFIG=$SDL2_CONFIG

else

SDL_CONFIG=$SDL1_CONFIG

fi

min_sdl_version=ifelse([$1], ,0.11.0,$1)

AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)

no_sdl=""

if test "$SDL_CONFIG" = "no" ; then

no_sdl=yes

else

SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`

SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`

sdl_major_version=`$SDL_CONFIG $sdl_args --version | \

sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`

sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \

sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`

sdl_micro_version=`$SDL_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 sdl-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, &micro) != 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*** 'sdl-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 sdl-config is correct, then it is\n", major, minor, micro);

printf("*** best to upgrade to the required version.\n");

printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");

printf("*** to point to the correct copy of sdl-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"

LIBS="$ac_save_LIBS"

fi

fi

if test "x$no_sdl" = x ; then

AC_MSG_RESULT(yes)

ifelse([$2], , :, [$2])

else

AC_MSG_RESULT(no)

if test "$SDL_CONFIG" = "no" ; then

echo "*** The sdl-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 SDL_CONFIG environment variable to the"

echo "*** full path to sdl-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 sdl-config script: $SDL_CONFIG" ])

CFLAGS="$ac_save_CFLAGS"

CXXFLAGS="$ac_save_CXXFLAGS"

LIBS="$ac_save_LIBS"

fi

fi

SDL_CFLAGS=""

SDL_CXXFLAGS=""

SDL_LIBS=""

ifelse([$3], , :, [$3])

fi

AC_SUBST(SDL_CFLAGS)

AC_SUBST(SDL_LIBS)

rm -f conf.sdltest

])