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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_SDL([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_SDL],
     14 [dnl 
     15 dnl Get the cflags and libraries from the sdl-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   if test x$sdl_exec_prefix != x ; then
     25     sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
     26     if test x${SDL_CONFIG+set} != xset ; then
     27       SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config
     28     fi
     29   fi
     30   if test x$sdl_prefix != x ; then
     31     sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
     32     if test x${SDL_CONFIG+set} != xset ; then
     33       SDL_CONFIG=$sdl_prefix/bin/sdl-config
     34     fi
     35   fi
     36 
     37   as_save_PATH="$PATH"
     38   if test "x$prefix" != xNONE; then
     39     PATH="$prefix/bin:$prefix/usr/bin:$PATH"
     40   fi
     41   AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
     42   PATH="$as_save_PATH"
     43   min_sdl_version=ifelse([$1], ,0.11.0,$1)
     44   AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
     45   no_sdl=""
     46   if test "$SDL_CONFIG" = "no" ; then
     47     no_sdl=yes
     48   else
     49     SDL_CFLAGS=`$SDL_CONFIG $sdl_config_args --cflags`
     50     SDL_LIBS=`$SDL_CONFIG $sdl_config_args --libs`
     51 
     52     sdl_major_version=`$SDL_CONFIG $sdl_config_args --version | \
     53            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
     54     sdl_minor_version=`$SDL_CONFIG $sdl_config_args --version | \
     55            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
     56     sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \
     57            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
     58     if test "x$enable_sdltest" = "xyes" ; then
     59       ac_save_CFLAGS="$CFLAGS"
     60       ac_save_CXXFLAGS="$CXXFLAGS"
     61       ac_save_LIBS="$LIBS"
     62       CFLAGS="$CFLAGS $SDL_CFLAGS"
     63       CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
     64       LIBS="$LIBS $SDL_LIBS"
     65 dnl
     66 dnl Now check if the installed SDL is sufficiently new. (Also sanity
     67 dnl checks the results of sdl-config to some extent
     68 dnl
     69       rm -f conf.sdltest
     70       AC_TRY_RUN([
     71 #include <stdio.h>
     72 #include <stdlib.h>
     73 #include <string.h>
     74 #include "SDL.h"
     75 
     76 char*
     77 my_strdup (char *str)
     78 {
     79   char *new_str;
     80   
     81   if (str)
     82     {
     83       new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
     84       strcpy (new_str, str);
     85     }
     86   else
     87     new_str = NULL;
     88   
     89   return new_str;
     90 }
     91 
     92 int main (int argc, char *argv[])
     93 {
     94   int major, minor, micro;
     95   char *tmp_version;
     96 
     97   /* This hangs on some systems (?)
     98   system ("touch conf.sdltest");
     99   */
    100   { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
    101 
    102   /* HP/UX 9 (%@#!) writes to sscanf strings */
    103   tmp_version = my_strdup("$min_sdl_version");
    104   if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    105      printf("%s, bad version string\n", "$min_sdl_version");
    106      exit(1);
    107    }
    108 
    109    if (($sdl_major_version > major) ||
    110       (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
    111       (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
    112     {
    113       return 0;
    114     }
    115   else
    116     {
    117       printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
    118       printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro);
    119       printf("*** best to upgrade to the required version.\n");
    120       printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");
    121       printf("*** to point to the correct copy of sdl-config, and remove the file\n");
    122       printf("*** config.cache before re-running configure\n");
    123       return 1;
    124     }
    125 }
    126 
    127 ],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
    128        CFLAGS="$ac_save_CFLAGS"
    129        CXXFLAGS="$ac_save_CXXFLAGS"
    130        LIBS="$ac_save_LIBS"
    131      fi
    132   fi
    133   if test "x$no_sdl" = x ; then
    134      AC_MSG_RESULT(yes)
    135      ifelse([$2], , :, [$2])     
    136   else
    137      AC_MSG_RESULT(no)
    138      if test "$SDL_CONFIG" = "no" ; then
    139        echo "*** The sdl-config script installed by SDL could not be found"
    140        echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
    141        echo "*** your path, or set the SDL_CONFIG environment variable to the"
    142        echo "*** full path to sdl-config."
    143      else
    144        if test -f conf.sdltest ; then
    145         :
    146        else
    147           echo "*** Could not run SDL test program, checking why..."
    148           CFLAGS="$CFLAGS $SDL_CFLAGS"
    149           CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
    150           LIBS="$LIBS $SDL_LIBS"
    151           AC_TRY_LINK([
    152 #include <stdio.h>
    153 #include "SDL.h"
    154 
    155 int main(int argc, char *argv[])
    156 { return 0; }
    157 #undef  main
    158 #define main K_and_R_C_main
    159 ],      [ return 0; ],
    160         [ echo "*** The test program compiled, but did not run. This usually means"
    161           echo "*** that the run-time linker is not finding SDL or finding the wrong"
    162           echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
    163           echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
    164           echo "*** to the installed location  Also, make sure you have run ldconfig if that"
    165           echo "*** is required on your system"
    166 	  echo "***"
    167           echo "*** If you have an old version installed, it is best to remove it, although"
    168           echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
    169         [ echo "*** The test program failed to compile or link. See the file config.log for the"
    170           echo "*** exact error that occured. This usually means SDL was incorrectly installed"
    171           echo "*** or that you have moved SDL since it was installed. In the latter case, you"
    172           echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ])
    173           CFLAGS="$ac_save_CFLAGS"
    174           CXXFLAGS="$ac_save_CXXFLAGS"
    175           LIBS="$ac_save_LIBS"
    176        fi
    177      fi
    178      SDL_CFLAGS=""
    179      SDL_LIBS=""
    180      ifelse([$3], , :, [$3])
    181   fi
    182   AC_SUBST(SDL_CFLAGS)
    183   AC_SUBST(SDL_LIBS)
    184   rm -f conf.sdltest
    185 ])
    186