From 6418ff065f6b126638057ea30700e4b6d447d73d Mon Sep 17 00:00:00 2001
From: Maarten ter Huurne <maarten@treewalker.org>
Date: Tue, 21 Apr 2015 17:43:26 +0200
Subject: [PATCH] Updated SDL configure check

This check was copied from SDL 1.2.15's version of "sdl.m4".

This fixes a problem where "sdl.h" cannot be found on native compiles
because the output of the sdl-config script is ignored when compiling
the test program.
---
 acinclude.m4 | 45 +++++++++++++++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index 38d8b0f..639eb85 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -5,10 +5,12 @@
 # stolen from Manish Singh
 # Shamelessly stolen from Owen Taylor
 
+# serial 1
+
 dnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
 dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS
 dnl
-AC_DEFUN(AM_PATH_SDL,
+AC_DEFUN([AM_PATH_SDL],
 [dnl 
 dnl Get the cflags and libraries from the sdl-config script
 dnl
@@ -20,38 +22,45 @@ AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run
 		    , enable_sdltest=yes)
 
   if test x$sdl_exec_prefix != x ; then
-     sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix"
-     if test x${SDL_CONFIG+set} != xset ; then
-        SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config
-     fi
+    sdl_config_args="$sdl_config_args --exec-prefix=$sdl_exec_prefix"
+    if test x${SDL_CONFIG+set} != xset ; then
+      SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config
+    fi
   fi
   if test x$sdl_prefix != x ; then
-     sdl_args="$sdl_args --prefix=$sdl_prefix"
-     if test x${SDL_CONFIG+set} != xset ; then
-        SDL_CONFIG=$sdl_prefix/bin/sdl-config
-     fi
+    sdl_config_args="$sdl_config_args --prefix=$sdl_prefix"
+    if test x${SDL_CONFIG+set} != xset ; then
+      SDL_CONFIG=$sdl_prefix/bin/sdl-config
+    fi
   fi
 
-  AC_PATH_PROG(SDL_CONFIG, sdl-config, no)
+  as_save_PATH="$PATH"
+  if test "x$prefix" != xNONE; then
+    PATH="$prefix/bin:$prefix/usr/bin:$PATH"
+  fi
+  AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH])
+  PATH="$as_save_PATH"
   min_sdl_version=ifelse([$1], ,0.11.0,$1)
   AC_MSG_CHECKING(for SDL - version >= $min_sdl_version)
   no_sdl=""
   if test "$SDL_CONFIG" = "no" ; then
     no_sdl=yes
   else
-    SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags`
-    SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs`
+    SDL_CFLAGS=`$SDL_CONFIG $sdl_config_args --cflags`
+    SDL_LIBS=`$SDL_CONFIG $sdl_config_args --libs`
 
-    sdl_major_version=`$SDL_CONFIG $sdl_args --version | \
+    sdl_major_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
-    sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \
+    sdl_minor_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
     sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \
            sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
     if test "x$enable_sdltest" = "xyes" ; then
       ac_save_CFLAGS="$CFLAGS"
+      ac_save_CXXFLAGS="$CXXFLAGS"
       ac_save_LIBS="$LIBS"
       CFLAGS="$CFLAGS $SDL_CFLAGS"
+      CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
       LIBS="$LIBS $SDL_LIBS"
 dnl
 dnl Now check if the installed SDL is sufficiently new. (Also sanity
@@ -117,6 +126,7 @@ int main (int argc, char *argv[])
 
 ],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
        CFLAGS="$ac_save_CFLAGS"
+       CXXFLAGS="$ac_save_CXXFLAGS"
        LIBS="$ac_save_LIBS"
      fi
   fi
@@ -136,10 +146,16 @@ int main (int argc, char *argv[])
        else
           echo "*** Could not run SDL test program, checking why..."
           CFLAGS="$CFLAGS $SDL_CFLAGS"
+          CXXFLAGS="$CXXFLAGS $SDL_CFLAGS"
           LIBS="$LIBS $SDL_LIBS"
           AC_TRY_LINK([
 #include <stdio.h>
 #include "SDL.h"
+
+int main(int argc, char *argv[])
+{ return 0; }
+#undef  main
+#define main K_and_R_C_main
 ],      [ return 0; ],
         [ echo "*** The test program compiled, but did not run. This usually means"
           echo "*** that the run-time linker is not finding SDL or finding the wrong"
@@ -155,6 +171,7 @@ int main (int argc, char *argv[])
           echo "*** or that you have moved SDL since it was installed. In the latter case, you"
           echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ])
           CFLAGS="$ac_save_CFLAGS"
+          CXXFLAGS="$ac_save_CXXFLAGS"
           LIBS="$ac_save_LIBS"
        fi
      fi