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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 dnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
      9 dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
     10 dnl
     11 AC_DEFUN([AM_PATH_SDL],
     12 [dnl 
     13 dnl Get the cflags and libraries from the sdl-config script
     14 dnl
     15 AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],
     16             sdl_prefix="$withval", sdl_prefix="")
     17 AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
     18             sdl_exec_prefix="$withval", sdl_exec_prefix="")
     19 AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],
     20 		    , enable_sdltest=yes)
     21 
     22   if test x$sdl_exec_prefix != x ; then
     23     sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix"
     24     if test x${SDL_CONFIG+set} != xset ; then
     25        SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config
     26     fi
     27   fi
     28   if test x$sdl_prefix != x ; then
     29     sdl_args="$sdl_args --prefix=$sdl_prefix"
     30     if test x${SDL_CONFIG+set} != xset ; then
     31        SDL_CONFIG=$sdl_prefix/bin/sdl-config
     32     fi
     33   fi
     34 
     35   if test "x$prefix" != xNONE; then
     36     PATH="$prefix/bin:$prefix/usr/bin:$PATH"
     37   fi
     38   AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
     39   min_sdl_version=ifelse([$1], ,0.11.0,$1)
     40   AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
     41   no_sdl=""
     42   if test "$SDL_CONFIG" = "no" ; then
     43     no_sdl=yes
     44   else
     45     SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`
     46     SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`
     47 
     48     sdl_major_version=`$SDL_CONFIG $sdl_args --version | \
     49            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
     50     sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \
     51            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
     52     sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \
     53            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
     54     if test "x$enable_sdltest" = "xyes" ; then
     55       ac_save_CFLAGS="$CFLAGS"
     56       ac_save_CXXFLAGS="$CXXFLAGS"
     57       ac_save_LIBS="$LIBS"
     58       CFLAGS="$CFLAGS $SDL_CFLAGS"
     59       CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
     60       LIBS="$LIBS $SDL_LIBS"
     61 dnl
     62 dnl Now check if the installed SDL is sufficiently new. (Also sanity
     63 dnl checks the results of sdl-config to some extent
     64 dnl
     65       rm -f conf.sdltest
     66       AC_TRY_RUN([
     67 #include <stdio.h>
     68 #include <stdlib.h>
     69 #include <string.h>
     70 #include "SDL.h"
     71 
     72 char*
     73 my_strdup (char *str)
     74 {
     75   char *new_str;
     76   
     77   if (str)
     78     {
     79       new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
     80       strcpy (new_str, str);
     81     }
     82   else
     83     new_str = NULL;
     84   
     85   return new_str;
     86 }
     87 
     88 int main (int argc, char *argv[])
     89 {
     90   int major, minor, micro;
     91   char *tmp_version;
     92 
     93   /* This hangs on some systems (?)
     94   system ("touch conf.sdltest");
     95   */
     96   { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
     97 
     98   /* HP/UX 9 (%@#!) writes to sscanf strings */
     99   tmp_version = my_strdup("$min_sdl_version");
    100   if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    101      printf("%s, bad version string\n", "$min_sdl_version");
    102      exit(1);
    103    }
    104 
    105    if (($sdl_major_version > major) ||
    106       (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
    107       (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
    108     {
    109       return 0;
    110     }
    111   else
    112     {
    113       printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
    114       printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro);
    115       printf("*** best to upgrade to the required version.\n");
    116       printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");
    117       printf("*** to point to the correct copy of sdl-config, and remove the file\n");
    118       printf("*** config.cache before re-running configure\n");
    119       return 1;
    120     }
    121 }
    122 
    123 ],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
    124        CFLAGS="$ac_save_CFLAGS"
    125        CXXFLAGS="$ac_save_CXXFLAGS"
    126        LIBS="$ac_save_LIBS"
    127      fi
    128   fi
    129   if test "x$no_sdl" = x ; then
    130      AC_MSG_RESULT(yes)
    131      ifelse([$2], , :, [$2])     
    132   else
    133      AC_MSG_RESULT(no)
    134      if test "$SDL_CONFIG" = "no" ; then
    135        echo "*** The sdl-config script installed by SDL could not be found"
    136        echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
    137        echo "*** your path, or set the SDL_CONFIG environment variable to the"
    138        echo "*** full path to sdl-config."
    139      else
    140        if test -f conf.sdltest ; then
    141         :
    142        else
    143           echo "*** Could not run SDL test program, checking why..."
    144           CFLAGS="$CFLAGS $SDL_CFLAGS"
    145           CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
    146           LIBS="$LIBS $SDL_LIBS"
    147           AC_TRY_LINK([
    148 #include <stdio.h>
    149 #include "SDL.h"
    150 
    151 int main(int argc, char *argv[])
    152 { return 0; }
    153 #undef  main
    154 #define main K_and_R_C_main
    155 ],      [ return 0; ],
    156         [ echo "*** The test program compiled, but did not run. This usually means"
    157           echo "*** that the run-time linker is not finding SDL or finding the wrong"
    158           echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
    159           echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
    160           echo "*** to the installed location  Also, make sure you have run ldconfig if that"
    161           echo "*** is required on your system"
    162 	  echo "***"
    163           echo "*** If you have an old version installed, it is best to remove it, although"
    164           echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
    165         [ echo "*** The test program failed to compile or link. See the file config.log for the"
    166           echo "*** exact error that occured. This usually means SDL was incorrectly installed"
    167           echo "*** or that you have moved SDL since it was installed. In the latter case, you"
    168           echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ])
    169           CFLAGS="$ac_save_CFLAGS"
    170           CXXFLAGS="$ac_save_CXXFLAGS"
    171           LIBS="$ac_save_LIBS"
    172        fi
    173      fi
    174      SDL_CFLAGS=""
    175      SDL_LIBS=""
    176      ifelse([$3], , :, [$3])
    177   fi
    178   AC_SUBST(SDL_CFLAGS)
    179   AC_SUBST(SDL_LIBS)
    180   rm -f conf.sdltest
    181 ])
    182