dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_pkg_swig.html
dnl
AC_DEFUN([AC_PROG_SWIG],[
	AC_PATH_PROG([SWIG],[swig])
	if test -z "$SWIG" ; then
		AC_MSG_WARN([cannot find 'swig' program. You should look at http://www.swig.org])
		SWIG='echo "Error: SWIG is not installed. You should look at http://www.swig.org" ; false'
	elif test -n "$1" ; then
		AC_MSG_CHECKING([for SWIG version])
		[swig_version=`$SWIG -version 2>&1 | grep 'SWIG Version' | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`]
		AC_MSG_RESULT([$swig_version])
		if test -n "$swig_version" ; then
			# Calculate the required version number components
			[required=$1]
			[required_major=`echo $required | sed 's/[^0-9].*//'`]
			if test -z "$required_major" ; then
				[required_major=0]
			fi
			[required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
			[required_minor=`echo $required | sed 's/[^0-9].*//'`]
			if test -z "$required_minor" ; then
				[required_minor=0]
			fi
			[required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
			[required_patch=`echo $required | sed 's/[^0-9].*//'`]
			if test -z "$required_patch" ; then
				[required_patch=0]
			fi
			# Calculate the available version number components
			[available=$swig_version]
			[available_major=`echo $available | sed 's/[^0-9].*//'`]
			if test -z "$available_major" ; then
				[available_major=0]
			fi
			[available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
			[available_minor=`echo $available | sed 's/[^0-9].*//'`]
			if test -z "$available_minor" ; then
				[available_minor=0]
			fi
			[available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
			[available_patch=`echo $available | sed 's/[^0-9].*//'`]
			if test -z "$available_patch" ; then
				[available_patch=0]
			fi
			if test $available_major -ne $required_major \
				-o $available_minor -ne $required_minor \
				-o $available_patch -lt $required_patch ; then
				AC_MSG_WARN([SWIG version >= $1 is required.  You have $swig_version.  You should look at http://www.swig.org])
				SWIG='echo "Error: SWIG version >= $1 is required.  You have '"$swig_version"'.  You should look at http://www.swig.org" ; false'
			else
				AC_MSG_NOTICE([SWIG executable is '$SWIG'])
				SWIG_LIB=`$SWIG -swiglib`
				AC_MSG_NOTICE([SWIG runtime library directory is '$SWIG_LIB'])
			fi
		else
			AC_MSG_WARN([cannot determine SWIG version])
			SWIG='echo "Error: Cannot determine SWIG version.  You should look at http://www.swig.org" ; false'
		fi
	fi
	AC_SUBST([SWIG_LIB])
])

# SWIG_ENABLE_CXX()
#
# Enable SWIG C++ support.  This affects all invocations of $(SWIG).
AC_DEFUN([SWIG_ENABLE_CXX],[
	AC_REQUIRE([AC_PROG_SWIG])
	AC_REQUIRE([AC_PROG_CXX])
	SWIG="$SWIG -c++"
])

# SWIG_MULTI_MODULE_SUPPORT()
#
# Enable support for multiple modules.  This effects all invocations
# of $(SWIG).  You have to link all generated modules against the
# appropriate SWIG runtime library.  If you want to build Python
# modules for example, use the SWIG_PYTHON() macro and link the
# modules against $(SWIG_PYTHON_LIBS).
AC_DEFUN([SWIG_MULTI_MODULE_SUPPORT],[
	AC_REQUIRE([AC_PROG_SWIG])
	SWIG="$SWIG -c"
])

# SWIG_PYTHON([use-shadow-classes = {no, yes}])
#
# Checks for Python and provides the $(SWIG_PYTHON_CPPFLAGS),
# $(SWIG_PYTHON_LIBS) and $(SWIG_PYTHON_OPT) output variables.
# $(SWIG_PYTHON_OPT) contains all necessary SWIG options to generate
# code for Python.  Shadow classes are enabled unless the value of the
# optional first argument is exactly 'no'.  If you need multi module
# support (provided by the SWIG_MULTI_MODULE_SUPPORT() macro) use
# $(SWIG_PYTHON_LIBS) to link against the appropriate library.  It
# contains the SWIG Python runtime library that is needed by the type
# check system for example.
AC_DEFUN([SWIG_PYTHON],[
	AC_REQUIRE([AC_PROG_SWIG])
	AC_REQUIRE([AC_PYTHON_DEVEL])
	test "x$1" != "xno" || swig_shadow=" -noproxy"
	AC_SUBST([SWIG_PYTHON_OPT],[-python$swig_shadow])
	AC_SUBST([SWIG_PYTHON_CPPFLAGS],[$PYTHON_CPPFLAGS])
	AC_SUBST([SWIG_PYTHON_LIBS],["-L$SWIG_LIB -lswigpy"])
])


dnl @synopsis AC_LIB_WAD
dnl
dnl This macro searches for installed WAD library.
dnl
AC_DEFUN([AC_LIB_WAD],
[
	AC_REQUIRE([AC_PYTHON_DEVEL])
	AC_ARG_ENABLE(wad,
	AC_HELP_STRING([--enable-wad], [enable wad module]),
	[
		case "${enableval}" in
			no)	;;
			*)	if test "x${enableval}" = xyes;
				then
					check_wad="yes"
				fi ;;
		esac
	], [])

	if test -n "$check_wad";
	then
		AC_CHECK_LIB(wadpy, _init, [WADPY=-lwadpy], [], $PYTHON_LDFLAGS $PYTHON_EXTRA_LIBS)
		AC_SUBST(WADPY)
	fi
])