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  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 $SDL_LIBS"
61dnl
62dnl Now check if the installed SDL is sufficiently new. (Also sanity
63dnl checks the results of sdl-config to some extent
64dnl
65      rm -f conf.sdltest
66      AC_TRY_RUN([
67#include <stdio.h>
68#include <stdlib.h>
69#include <string.h>
70#include "SDL.h"
71
72char*
73my_strdup (char *str)
74{
75  char *new_str;
76  
77  if (str)
78    {
79      new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
80      strcpy (new_str, str);
81    }
82  else
83    new_str = NULL;
84  
85  return new_str;
86}
87
88int main (int argc, char *argv[])
89{
90  int major, minor, micro;
91  char *tmp_version;
92
93  /* This hangs on some systems (?)
94  system ("touch conf.sdltest");
95  */
96  { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
97
98  /* HP/UX 9 (%@#!) writes to sscanf strings */
99  tmp_version = my_strdup("$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
151int 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