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
8dnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
9dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
10dnl
11AC_DEFUN([AM_PATH_SDL],
12[dnl
13dnl Get the cflags and libraries from the sdl-config script
14dnl
15AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],
16            sdl_prefix="$withval", sdl_prefix="")
17AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
18            sdl_exec_prefix="$withval", sdl_exec_prefix="")
19AC_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  AC_REQUIRE([AC_CANONICAL_TARGET])
36  PATH="$prefix/bin:$prefix/usr/bin:$PATH"
37  AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
38  min_sdl_version=ifelse([$1], ,0.11.0,$1)
39  AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
40  no_sdl=""
41  if test "$SDL_CONFIG" = "no" ; then
42    no_sdl=yes
43  else
44    SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`
45    SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`
46
47    sdl_major_version=`$SDL_CONFIG $sdl_args --version | \
48           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
49    sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \
50           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
51    sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \
52           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
53    if test "x$enable_sdltest" = "xyes" ; then
54      ac_save_CFLAGS="$CFLAGS"
55      ac_save_CXXFLAGS="$CXXFLAGS"
56      ac_save_LIBS="$LIBS"
57      CFLAGS="$CFLAGS $SDL_CFLAGS"
58      CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
59      LIBS="$LIBS $SDL_LIBS"
60dnl
61dnl Now check if the installed SDL is sufficiently new. (Also sanity
62dnl checks the results of sdl-config to some extent
63dnl
64      rm -f conf.sdltest
65      AC_TRY_RUN([
66#include <stdio.h>
67#include <stdlib.h>
68#include <string.h>
69#include "SDL.h"
70
71char*
72my_strdup (char *str)
73{
74  char *new_str;
75
76  if (str)
77    {
78      new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
79      strcpy (new_str, str);
80    }
81  else
82    new_str = NULL;
83
84  return new_str;
85}
86
87int main (int argc, char *argv[])
88{
89  int major, minor, micro;
90  char *tmp_version;
91
92  /* This hangs on some systems (?)
93  system ("touch conf.sdltest");
94  */
95  { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
96
97  /* HP/UX 9 (%@#!) writes to sscanf strings */
98  tmp_version = my_strdup("$min_sdl_version");
99  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
100     printf("%s, bad version string\n", "$min_sdl_version");
101     exit(1);
102   }
103
104   if (($sdl_major_version > major) ||
105      (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
106      (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
107    {
108      return 0;
109    }
110  else
111    {
112      printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
113      printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro);
114      printf("*** best to upgrade to the required version.\n");
115      printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");
116      printf("*** to point to the correct copy of sdl-config, and remove the file\n");
117      printf("*** config.cache before re-running configure\n");
118      return 1;
119    }
120}
121
122],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
123       CFLAGS="$ac_save_CFLAGS"
124       LIBS="$ac_save_LIBS"
125     fi
126  fi
127  if test "x$no_sdl" = x ; then
128     AC_MSG_RESULT(yes)
129     ifelse([$2], , :, [$2])
130  else
131     AC_MSG_RESULT(no)
132     if test "$SDL_CONFIG" = "no" ; then
133       echo "*** The sdl-config script installed by SDL could not be found"
134       echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
135       echo "*** your path, or set the SDL_CONFIG environment variable to the"
136       echo "*** full path to sdl-config."
137     else
138       if test -f conf.sdltest ; then
139        :
140       else
141          echo "*** Could not run SDL test program, checking why..."
142          CFLAGS="$CFLAGS $SDL_CFLAGS"
143          CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
144          LIBS="$LIBS $SDL_LIBS"
145          AC_TRY_LINK([
146#include <stdio.h>
147#include "SDL.h"
148
149int main(int argc, char *argv[])
150{ return 0; }
151#undef  main
152#define main K_and_R_C_main
153],      [ return 0; ],
154        [ echo "*** The test program compiled, but did not run. This usually means"
155          echo "*** that the run-time linker is not finding SDL or finding the wrong"
156          echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
157          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
158          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
159          echo "*** is required on your system"
160	  echo "***"
161          echo "*** If you have an old version installed, it is best to remove it, although"
162          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
163        [ echo "*** The test program failed to compile or link. See the file config.log for the"
164          echo "*** exact error that occured. This usually means SDL was incorrectly installed"
165          echo "*** or that you have moved SDL since it was installed. In the latter case, you"
166          echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ])
167          CFLAGS="$ac_save_CFLAGS"
168          CXXFLAGS="$ac_save_CXXFLAGS"
169          LIBS="$ac_save_LIBS"
170       fi
171     fi
172     SDL_CFLAGS=""
173     SDL_CXXFLAGS=""
174     SDL_LIBS=""
175     ifelse([$3], , :, [$3])
176  fi
177  AC_SUBST(SDL_CFLAGS)
178  AC_SUBST(SDL_LIBS)
179  rm -f conf.sdltest
180])
181