dnl @synopsis AC_PROG_SWIG([major.minor.micro])
dnl
dnl This macro searches for a SWIG installation on your system. If found you
dnl should) SWIG via $(SWIG).  You can use the optional first argument to check
dnl if the version of the available SWIG is greater than or equal to the
dnl value of the argument.  It should have the format: N[.N[.N]] (N is a
dnl number between 0 and 999.  Only the first N is mandatory.)
dnl
dnl If the version argument is given (e.g. 1.3.17), AC_PROG_SWIG checks that the
dnl swig package is this version number or higher.
dnl
dnl In configure.in, use as:
dnl
dnl		AC_PROG_SWIG(1.3.17)
dnl		SWIG_ENABLE_CXX
dnl		SWIG_MULTI_MODULE_SUPPORT
dnl		SWIG_PYTHON
dnl
dnl @authors Sebastian Huber <address@hidden>, Alan W. Irwin
dnl <address@hidden>, Rafael Laboissiere <address@hidden> and
dnl Andrew Collier <address@hidden>.
dnl
dnl
AC_DEFUN([AC_PROG_SWIG],[
	AC_PATH_PROG([SWIG],[swig])
	if test -z "$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
])