test/acinclude.m4
author Sam Lantinga <slouken@libsdl.org>
Mon, 21 Sep 2009 07:32:26 +0000
branchSDL-1.2
changeset 4209 62e86ab81e3c
parent 1755 91063c450171
child 6250 cce0ddcf6747
permissions -rw-r--r--
Fixed bug #570

SDL_SemWaitTimeout in src/thread/generic/SDL_syssem.c line 179 (SVN trunk):

--sem->count;

should be

if (retval == 0) {
--sem->count;
}

Without this, sem->count will underflow on timeout effectively breaking the
semaphore. It appears that the implementation has been wrong since the initial
revision.
     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 ])