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      1 # Configure paths for SDL
      2 # Sam Lantinga 9/21/99
      3 # stolen from Manish Singh
      4 # stolen back from Frank Belew
      5 # stolen from Manish Singh
      6 # Shamelessly stolen from Owen Taylor
      7 
      8 # serial 1
      9 
     10 dnl AM_PATH_SDL2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
     11 dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
     12 dnl
     13 AC_DEFUN([AM_PATH_SDL2],
     14 [dnl 
     15 dnl Get the cflags and libraries from the sdl2-config script
     16 dnl
     17 AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],
     18             sdl_prefix="$withval", sdl_prefix="")
     19 AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
     20             sdl_exec_prefix="$withval", sdl_exec_prefix="")
     21 AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],
     22 		    , enable_sdltest=yes)
     23 
     24   min_sdl_version=ifelse([$1], ,2.0.0,$1)
     25 
     26   if test "x$sdl_prefix$sdl_exec_prefix" = x ; then
     27     PKG_CHECK_MODULES([SDL], [sdl2 >= $min_sdl_version],
     28            [sdl_pc=yes],
     29            [sdl_pc=no])
     30   else
     31     sdl_pc=no
     32     if test x$sdl_exec_prefix != x ; then
     33       sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
     34       if test x${SDL2_CONFIG+set} != xset ; then
     35         SDL2_CONFIG=$sdl_exec_prefix/bin/sdl2-config
     36       fi
     37     fi
     38     if test x$sdl_prefix != x ; then
     39       sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
     40       if test x${SDL2_CONFIG+set} != xset ; then
     41         SDL2_CONFIG=$sdl_prefix/bin/sdl2-config
     42       fi
     43     fi
     44   fi
     45 
     46   if test "x$sdl_pc" = xyes ; then
     47     no_sdl=""
     48     SDL2_CONFIG="pkg-config sdl2"
     49   else
     50     as_save_PATH="$PATH"
     51     if test "x$prefix" != xNONE && test "$cross_compiling" != yes; then
     52       PATH="$prefix/bin:$prefix/usr/bin:$PATH"
     53     fi
     54     AC_PATH_PROG(SDL2_CONFIG, sdl2-config, no, [$PATH])
     55     PATH="$as_save_PATH"
     56     AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
     57     no_sdl=""
     58 
     59     if test "$SDL2_CONFIG" = "no" ; then
     60       no_sdl=yes
     61     else
     62       SDL_CFLAGS=`$SDL2_CONFIG $sdl_config_args --cflags`
     63       SDL_LIBS=`$SDL2_CONFIG $sdl_config_args --libs`
     64 
     65       sdl_major_version=`$SDL2_CONFIG $sdl_config_args --version | \
     66              sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
     67       sdl_minor_version=`$SDL2_CONFIG $sdl_config_args --version | \
     68              sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
     69       sdl_micro_version=`$SDL2_CONFIG $sdl_config_args --version | \
     70              sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
     71       if test "x$enable_sdltest" = "xyes" ; then
     72         ac_save_CFLAGS="$CFLAGS"
     73         ac_save_CXXFLAGS="$CXXFLAGS"
     74         ac_save_LIBS="$LIBS"
     75         CFLAGS="$CFLAGS $SDL_CFLAGS"
     76         CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
     77         LIBS="$LIBS $SDL_LIBS"
     78 dnl
     79 dnl Now check if the installed SDL is sufficiently new. (Also sanity
     80 dnl checks the results of sdl2-config to some extent
     81 dnl
     82       rm -f conf.sdltest
     83       AC_TRY_RUN([
     84 #include <stdio.h>
     85 #include <stdlib.h>
     86 #include <string.h>
     87 #include "SDL.h"
     88 
     89 char*
     90 my_strdup (char *str)
     91 {
     92   char *new_str;
     93   
     94   if (str)
     95     {
     96       new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
     97       strcpy (new_str, str);
     98     }
     99   else
    100     new_str = NULL;
    101   
    102   return new_str;
    103 }
    104 
    105 int main (int argc, char *argv[])
    106 {
    107   int major, minor, micro;
    108   char *tmp_version;
    109 
    110   /* This hangs on some systems (?)
    111   system ("touch conf.sdltest");
    112   */
    113   { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
    114 
    115   /* HP/UX 9 (%@#!) writes to sscanf strings */
    116   tmp_version = my_strdup("$min_sdl_version");
    117   if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    118      printf("%s, bad version string\n", "$min_sdl_version");
    119      exit(1);
    120    }
    121 
    122    if (($sdl_major_version > major) ||
    123       (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
    124       (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
    125     {
    126       return 0;
    127     }
    128   else
    129     {
    130       printf("\n*** 'sdl2-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
    131       printf("*** of SDL required is %d.%d.%d. If sdl2-config is correct, then it is\n", major, minor, micro);
    132       printf("*** best to upgrade to the required version.\n");
    133       printf("*** If sdl2-config was wrong, set the environment variable SDL2_CONFIG\n");
    134       printf("*** to point to the correct copy of sdl2-config, and remove the file\n");
    135       printf("*** config.cache before re-running configure\n");
    136       return 1;
    137     }
    138 }
    139 
    140 ],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
    141         CFLAGS="$ac_save_CFLAGS"
    142         CXXFLAGS="$ac_save_CXXFLAGS"
    143         LIBS="$ac_save_LIBS"
    144       fi
    145     fi
    146     if test "x$no_sdl" = x ; then
    147       AC_MSG_RESULT(yes)
    148     else
    149       AC_MSG_RESULT(no)
    150     fi
    151   fi
    152   if test "x$no_sdl" = x ; then
    153      ifelse([$2], , :, [$2])
    154   else
    155      if test "$SDL2_CONFIG" = "no" ; then
    156        echo "*** The sdl2-config script installed by SDL could not be found"
    157        echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
    158        echo "*** your path, or set the SDL2_CONFIG environment variable to the"
    159        echo "*** full path to sdl2-config."
    160      else
    161        if test -f conf.sdltest ; then
    162         :
    163        else
    164           echo "*** Could not run SDL test program, checking why..."
    165           CFLAGS="$CFLAGS $SDL_CFLAGS"
    166           CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
    167           LIBS="$LIBS $SDL_LIBS"
    168           AC_TRY_LINK([
    169 #include <stdio.h>
    170 #include "SDL.h"
    171 
    172 int main(int argc, char *argv[])
    173 { return 0; }
    174 #undef  main
    175 #define main K_and_R_C_main
    176 ],      [ return 0; ],
    177         [ echo "*** The test program compiled, but did not run. This usually means"
    178           echo "*** that the run-time linker is not finding SDL or finding the wrong"
    179           echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
    180           echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
    181           echo "*** to the installed location  Also, make sure you have run ldconfig if that"
    182           echo "*** is required on your system"
    183 	  echo "***"
    184           echo "*** If you have an old version installed, it is best to remove it, although"
    185           echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
    186         [ echo "*** The test program failed to compile or link. See the file config.log for the"
    187           echo "*** exact error that occured. This usually means SDL was incorrectly installed"
    188           echo "*** or that you have moved SDL since it was installed. In the latter case, you"
    189           echo "*** may want to edit the sdl2-config script: $SDL2_CONFIG" ])
    190           CFLAGS="$ac_save_CFLAGS"
    191           CXXFLAGS="$ac_save_CXXFLAGS"
    192           LIBS="$ac_save_LIBS"
    193        fi
    194      fi
    195      SDL_CFLAGS=""
    196      SDL_LIBS=""
    197      ifelse([$3], , :, [$3])
    198   fi
    199   AC_SUBST(SDL_CFLAGS)
    200   AC_SUBST(SDL_LIBS)
    201   rm -f conf.sdltest
    202 ])
    203