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
10dnl AM_PATH_SDL2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
11dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
12dnl
13AC_DEFUN([AM_PATH_SDL2],
14[dnl
15dnl Get the cflags and libraries from the sdl2-config script
16dnl
17AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],
18            sdl_prefix="$withval", sdl_prefix="")
19AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
20            sdl_exec_prefix="$withval", sdl_exec_prefix="")
21AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],
22		    , enable_sdltest=yes)
23
24  min_sdl_version=ifelse([$1], ,2.0.0,$1)
25
26  if test "x$sdl_prefix$sdl_exec_prefix" = x ; then
27    PKG_CHECK_MODULES([SDL], [sdl2 >= $min_sdl_version],
28           [sdl_pc=yes],
29           [sdl_pc=no])
30  else
31    sdl_pc=no
32    if test x$sdl_exec_prefix != x ; then
33      sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
34      if test x${SDL2_CONFIG+set} != xset ; then
35        SDL2_CONFIG=$sdl_exec_prefix/bin/sdl2-config
36      fi
37    fi
38    if test x$sdl_prefix != x ; then
39      sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
40      if test x${SDL2_CONFIG+set} != xset ; then
41        SDL2_CONFIG=$sdl_prefix/bin/sdl2-config
42      fi
43    fi
44  fi
45
46  if test "x$sdl_pc" = xyes ; then
47    no_sdl=""
48    SDL2_CONFIG="pkg-config sdl2"
49  else
50    as_save_PATH="$PATH"
51    if test "x$prefix" != xNONE && test "$cross_compiling" != yes; then
52      PATH="$prefix/bin:$prefix/usr/bin:$PATH"
53    fi
54    AC_PATH_PROG(SDL2_CONFIG, sdl2-config, no, [$PATH])
55    PATH="$as_save_PATH"
56    AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
57    no_sdl=""
58
59    if test "$SDL2_CONFIG" = "no" ; then
60      no_sdl=yes
61    else
62      SDL_CFLAGS=`$SDL2_CONFIG $sdl_config_args --cflags`
63      SDL_LIBS=`$SDL2_CONFIG $sdl_config_args --libs`
64
65      sdl_major_version=`$SDL2_CONFIG $sdl_config_args --version | \
66             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
67      sdl_minor_version=`$SDL2_CONFIG $sdl_config_args --version | \
68             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
69      sdl_micro_version=`$SDL2_CONFIG $sdl_config_args --version | \
70             sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
71      if test "x$enable_sdltest" = "xyes" ; then
72        ac_save_CFLAGS="$CFLAGS"
73        ac_save_CXXFLAGS="$CXXFLAGS"
74        ac_save_LIBS="$LIBS"
75        CFLAGS="$CFLAGS $SDL_CFLAGS"
76        CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
77        LIBS="$LIBS $SDL_LIBS"
78dnl
79dnl Now check if the installed SDL is sufficiently new. (Also sanity
80dnl checks the results of sdl2-config to some extent
81dnl
82      rm -f conf.sdltest
83      AC_TRY_RUN([
84#include <stdio.h>
85#include <stdlib.h>
86#include <string.h>
87#include "SDL.h"
88
89char*
90my_strdup (char *str)
91{
92  char *new_str;
93
94  if (str)
95    {
96      new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
97      strcpy (new_str, str);
98    }
99  else
100    new_str = NULL;
101
102  return new_str;
103}
104
105int main (int argc, char *argv[])
106{
107  int major, minor, micro;
108  char *tmp_version;
109
110  /* This hangs on some systems (?)
111  system ("touch conf.sdltest");
112  */
113  { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
114
115  /* HP/UX 9 (%@#!) writes to sscanf strings */
116  tmp_version = my_strdup("$min_sdl_version");
117  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
118     printf("%s, bad version string\n", "$min_sdl_version");
119     exit(1);
120   }
121
122   if (($sdl_major_version > major) ||
123      (($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
124      (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
125    {
126      return 0;
127    }
128  else
129    {
130      printf("\n*** 'sdl2-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
131      printf("*** of SDL required is %d.%d.%d. If sdl2-config is correct, then it is\n", major, minor, micro);
132      printf("*** best to upgrade to the required version.\n");
133      printf("*** If sdl2-config was wrong, set the environment variable SDL2_CONFIG\n");
134      printf("*** to point to the correct copy of sdl2-config, and remove the file\n");
135      printf("*** config.cache before re-running configure\n");
136      return 1;
137    }
138}
139
140],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
141        CFLAGS="$ac_save_CFLAGS"
142        CXXFLAGS="$ac_save_CXXFLAGS"
143        LIBS="$ac_save_LIBS"
144      fi
145    fi
146    if test "x$no_sdl" = x ; then
147      AC_MSG_RESULT(yes)
148    else
149      AC_MSG_RESULT(no)
150    fi
151  fi
152  if test "x$no_sdl" = x ; then
153     ifelse([$2], , :, [$2])
154  else
155     if test "$SDL2_CONFIG" = "no" ; then
156       echo "*** The sdl2-config script installed by SDL could not be found"
157       echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
158       echo "*** your path, or set the SDL2_CONFIG environment variable to the"
159       echo "*** full path to sdl2-config."
160     else
161       if test -f conf.sdltest ; then
162        :
163       else
164          echo "*** Could not run SDL test program, checking why..."
165          CFLAGS="$CFLAGS $SDL_CFLAGS"
166          CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
167          LIBS="$LIBS $SDL_LIBS"
168          AC_TRY_LINK([
169#include <stdio.h>
170#include "SDL.h"
171
172int main(int argc, char *argv[])
173{ return 0; }
174#undef  main
175#define main K_and_R_C_main
176],      [ return 0; ],
177        [ echo "*** The test program compiled, but did not run. This usually means"
178          echo "*** that the run-time linker is not finding SDL or finding the wrong"
179          echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
180          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
181          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
182          echo "*** is required on your system"
183	  echo "***"
184          echo "*** If you have an old version installed, it is best to remove it, although"
185          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
186        [ echo "*** The test program failed to compile or link. See the file config.log for the"
187          echo "*** exact error that occured. This usually means SDL was incorrectly installed"
188          echo "*** or that you have moved SDL since it was installed. In the latter case, you"
189          echo "*** may want to edit the sdl2-config script: $SDL2_CONFIG" ])
190          CFLAGS="$ac_save_CFLAGS"
191          CXXFLAGS="$ac_save_CXXFLAGS"
192          LIBS="$ac_save_LIBS"
193       fi
194     fi
195     SDL_CFLAGS=""
196     SDL_LIBS=""
197     ifelse([$3], , :, [$3])
198  fi
199  AC_SUBST(SDL_CFLAGS)
200  AC_SUBST(SDL_LIBS)
201  rm -f conf.sdltest
202])
203