File: acinclude.m4

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# Configure paths for SDL
# Modified for OpenCity by neoneurone on 9th november 2007
# Sam Lantinga 9/21/99
# stolen from Manish Singh
# stolen back from Frank Belew
# stolen from Manish Singh
# Shamelessly stolen from Owen Taylor

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],
[
dnl
dnl Get the cflags and libraries from the sdl-config script
dnl
AC_ARG_WITH(sdl-prefix,[  --with-sdl-prefix=PFX   Prefix where SDL is installed (optional)],
            sdl_prefix="$withval", sdl_prefix="")
AC_ARG_WITH(sdl-exec-prefix,[  --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)],
            sdl_exec_prefix="$withval", sdl_exec_prefix="")
AC_ARG_ENABLE(sdltest, [  --disable-sdltest       Do not try to compile and run a test SDL program],
		    , 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=$sdl_exec_prefix/bin/sdl-config
		fi
	fi
	if test x$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
	fi

	AC_REQUIRE([AC_CANONICAL_TARGET])
	PATH="$prefix/bin:$prefix/usr/bin:$PATH"
	AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$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_major_version=`$SDL_CONFIG $sdl_args --version | \
				sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
		sdl_minor_version=`$SDL_CONFIG $sdl_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_LIBS="$LIBS"
			CFLAGS="$CFLAGS $SDL_CFLAGS"
			LIBS="$LIBS $SDL_LIBS"
dnl
dnl Now check if the installed SDL is sufficiently new. (Also sanity
dnl checks the results of sdl-config to some extent
dnl
	rm -f conf.sdltest
	AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"

char*
my_strdup (char *str)
{
	char *new_str;
	
	if (str)
		{
		new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char));
		strcpy (new_str, str);
		}
	else
		new_str = NULL;
	
	return new_str;
}

int main (int argc, char *argv[])
{
	int major, minor, micro;
	char *tmp_version;
	
	/* This hangs on some systems (?)
	system ("touch conf.sdltest");
	*/
	{ FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); }
	
	/* HP/UX 9 (%@#!) writes to sscanf strings */
	tmp_version = my_strdup("$min_sdl_version");
	if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
		printf("%s, bad version string\n", "$min_sdl_version");
		exit(1);
	}
	
	if (($sdl_major_version > major) ||
		(($sdl_major_version == major) && ($sdl_minor_version > minor)) ||
		(($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro)))
	{
		return 0;
	}
	else
	{
		printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version);
		printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro);
		printf("*** best to upgrade to the required version.\n");
		printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n");
		printf("*** to point to the correct copy of sdl-config, and remove the file\n");
		printf("*** config.cache before re-running configure\n");
		return 1;
	}
}

],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
		CFLAGS="$ac_save_CFLAGS"
		LIBS="$ac_save_LIBS"
		fi
	fi
	if test "x$no_sdl" = x ; then
		AC_MSG_RESULT(yes)
		ifelse([$2], , :, [$2])
	else
		AC_MSG_RESULT(no)
		if test "$SDL_CONFIG" = "no" ; then
		echo "*** The sdl-config script installed by SDL could not be found"
		echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in"
		echo "*** your path, or set the SDL_CONFIG environment variable to the"
		echo "*** full path to sdl-config."
		else
		if test -f conf.sdltest ; then
			:
		else
			echo "*** Could not run SDL test program, checking why..."
			CFLAGS="$CFLAGS $SDL_CFLAGS"
			LIBS="$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"
          echo "*** version of SDL. If it is not finding SDL, you'll need to set your"
          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
          echo "*** is required on your system"
          echo "***"
          echo "*** If you have an old version installed, it is best to remove it, although"
          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means SDL was incorrectly installed"
          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"
          LIBS="$ac_save_LIBS"
		fi
		fi
		SDL_CFLAGS=""
		SDL_LIBS=""
		ifelse([$3], , :, [$3])
	fi
	AC_SUBST(SDL_CFLAGS)
	AC_SUBST(SDL_LIBS)
	rm -f conf.sdltest
])


# Check for binary relocation support.
# Written by Hongli Lai
# http://autopackage.org/

AC_DEFUN([AM_BINRELOC],
[
	AC_ARG_ENABLE(binreloc,
		[  --enable-binreloc       compile with binary relocation support
                          (default=enable when available)],
		enable_binreloc=$enableval,enable_binreloc=auto)

	AC_ARG_ENABLE(binreloc-threads,
		[  --enable-binreloc-threads      compile binary relocation with threads support
	                         (default=yes)],
		enable_binreloc_threads=$enableval,enable_binreloc_threads=yes)

	BINRELOC_CFLAGS=
	BINRELOC_LIBS=
	if test "x$enable_binreloc" = "xauto"; then
		AC_CHECK_FILE([/proc/self/maps])
		AC_CACHE_CHECK(
			[whether everything is installed to the same prefix],
			[br_cv_valid_prefixes],
			[
			if test "$bindir" = '${exec_prefix}/bin' -a "$sbindir" = '${exec_prefix}/sbin' -a \
				"$datadir" = '${prefix}/share' -a "$libdir" = '${exec_prefix}/lib' -a \
				"$libexecdir" = '${exec_prefix}/libexec' -a "$sysconfdir" = '${prefix}/etc'
			then
				br_cv_valid_prefixes=yes
			else
				br_cv_valid_prefixes=no
			fi
			])
	fi
	AC_CACHE_CHECK(
		[whether binary relocation support should be enabled],
		[br_cv_binreloc],
		[
		if test "x$enable_binreloc" = "xyes"; then
			br_cv_binreloc=yes
		elif test "x$enable_binreloc" = "xauto"; then
			if test "x$br_cv_valid_prefixes" = "xyes" -a \
					"x$ac_cv_file__proc_self_maps" = "xyes"; then
				br_cv_binreloc=yes
			else
				br_cv_binreloc=no
			fi
		else
			br_cv_binreloc=no
		fi
		])

	if test "x$br_cv_binreloc" = "xyes"; then
		BINRELOC_CFLAGS="-DENABLE_BINRELOC"
		AC_DEFINE(ENABLE_BINRELOC, 1, [Use binary relocation?])
		if test "x$enable_binreloc_threads" = "xyes"; then
			AC_CHECK_LIB([pthread], [pthread_getspecific])
		fi

		AC_CACHE_CHECK(
			[whether binary relocation should use threads],
			[br_cv_binreloc_threads],
			[
			if test "x$enable_binreloc_threads" = "xyes"; then
				if test "x$ac_cv_lib_pthread_pthread_getspecific" = "xyes"; then
					br_cv_binreloc_threads=yes
				else
					br_cv_binreloc_threads=no
				fi
			else
				br_cv_binreloc_threads=no
			fi
			])

		if test "x$br_cv_binreloc_threads" = "xyes"; then
			BINRELOC_LIBS="-lpthread"
			AC_DEFINE(BR_PTHREAD, 1, [Include pthread support for binary relocation?])
		else
			BINRELOC_CFLAGS="$BINRELOC_CFLAGS -DBR_PTHREADS=0"
			AC_DEFINE(BR_PTHREAD, 0, [Include pthread support for binary relocation?])
		fi
	fi
	AC_SUBST(BINRELOC_CFLAGS)
	AC_SUBST(BINRELOC_LIBS)
])