dnl # $Id$

dnl # Check for a working installation of libxml (version 2.)
dnl # Provides appropriate --with configuration options, fills the
dnl # LIBXML2_CFLAGS, LIBXML2_CPPFLAGS, LIBXML2_LDFLAGS and LIBXML2_LIBS
dnl # variables accordingly.


dnl # Copyright (c) 2008, 2009 Moritz Grimm <mgrimm@mrsserver.net>
dnl #
dnl # Permission to use, copy, modify, and distribute this software for any
dnl # purpose with or without fee is hereby granted, provided that the above
dnl # copyright notice and this permission notice appear in all copies.
dnl #
dnl # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
dnl # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
dnl # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
dnl # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
dnl # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
dnl # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
dnl # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.


dnl # For LIBXML2_CFLAGS, LIBXML2_CPPFLAGS, LIBXML2_LDFLAGS and LIBXML2_LIBS:
dnl # AX_CHECK_LIBXML2([LIBXML2-VERSION], [ACTION-IF-FOUND],
dnl #     [ACTION-IF-NOT-FOUND])


AC_DEFUN([_AX_CHECK_LIBXML2_OPTS],
[
AC_REQUIRE([PKG_PROG_PKG_CONFIG])
if test -z "${PKG_CONFIG}"; then
	AC_MSG_ERROR([The pkg-config utility is required.], [1])
fi
AC_ARG_VAR([LIBXML2_CFLAGS],
	[C compiler flags for libxml2])
AC_ARG_VAR([LIBXML2_CPPFLAGS],
	[C preprocessor flags for libxml2])
AC_ARG_VAR([LIBXML2_LDFLAGS],
	[linker flags for libxml2])
have_libxml2_includes=""
have_libxml2_libs=""
want_libxml2="auto"
AC_ARG_WITH([libxml2],
	[AS_HELP_STRING([--with-libxml2=PFX],
		[prefix where the libxml2 header files and library are installed (default: autodetect)])],
	[
case "${withval}" in
	yes)
		want_libxml2="yes"
		;;
	no)
		want_libxml2="no"
		;;
	*)
		have_libxml2_prefix="${withval}"
		want_libxml2="yes"
		;;
esac
	]
)
AC_ARG_WITH([libxml2-includes],
	[AS_HELP_STRING([--with-libxml2-includes=DIR],
		[directory where libxml2 header files are installed (optional)]) ],
	[
case "${withval}" in
	yes|no) ;;
	*)
		have_libxml2_includes="${withval}"
		;;
esac
	]
)
AC_ARG_WITH([libxml2-libs],
	[AS_HELP_STRING([--with-libxml2-libs=DIR],
		[directory where libxml2 is installed (optional)]) ],
	[
case "${withval}" in
	yes|no) ;;
	*)
		have_libxml2_libs="${withval}"
		;;
esac
	]
)
AC_CACHE_VAL([local_cv_have_lib_libxml2_opts],
[
ax_check_libxml2_xml2_pc="no"
PKG_CHECK_EXISTS([libxml-2.0], [ax_check_libxml2_xml2_pc=yes])
if test -z "${LIBXML2_CFLAGS}" \
    -a x"${ax_check_libxml2_xml2_pc}" = "xyes"; then
	LIBXML2_CFLAGS="`${PKG_CONFIG} --cflags-only-other libxml-2.0`"
fi
if test -n "${LIBXML2_CPPFLAGS}"; then
	if test -n "${have_libxml2_includes}"; then
		LIBXML2_CPPFLAGS="${LIBXML2_CPPFLAGS} -I${have_libxml2_includes}"
	fi
else
	if test -n "${have_libxml2_includes}"; then
		LIBXML2_CPPFLAGS="-I${have_libxml2_includes}"
	else
		if test x"${want_libxml2}" = "xauto" \
		    -a x"${ax_check_libxml2_xml2_pc}" = "xyes"; then
			LIBXML2_CPPFLAGS="`${PKG_CONFIG} --cflags-only-I libxml-2.0`"
		elif test -n "${have_libxml2_prefix}"; then
			LIBXML2_CPPFLAGS="-I${have_libxml2_prefix}/include"
		fi
	fi
fi
if test -n "${LIBXML2_LDFLAGS}"; then
	if test -n "${have_libxml2_libs}"; then
		LIBXML2_LDFLAGS="-L${have_libxml2_libs} ${LIBXML2_LDFLAGS}"
	fi
else
	if test -n "${have_libxml2_libs}"; then
		LIBXML2_LDFLAGS="-L${have_libxml2_libs}"
	else
		if test x"${want_libxml2}" = "xauto" \
		    -a x"${ax_check_libxml2_xml2_pc}" = "xyes"; then
			LIBXML2_LDFLAGS=" \
				`${PKG_CONFIG} --libs-only-L libxml-2.0` \
				`${PKG_CONFIG} --libs-only-other libxml-2.0` \
			"
		elif test -n "${have_libxml2_prefix}"; then
			LIBXML2_LDFLAGS="-L${have_libxml2_prefix}/lib"
		fi
	fi
fi
local_cv_have_lib_libxml2_opts=yes
])
])


AC_DEFUN([AX_CHECK_LIBXML2],
[
AC_REQUIRE([_AX_CHECK_LIBXML2_OPTS])
AC_ARG_VAR([LIBXML2_LIBS],
	[libraries to use for libxml2])
AC_CACHE_VAL([local_cv_have_lib_libxml2],
[
local_cv_have_lib_libxml2=no

if test x"${want_libxml2}" != "xno"; then	# want_libxml2 != no

if test -z "${PKG_CONFIG}"; then
	AC_MSG_ERROR([The pkg-config utility is required.], [1])
fi

dnl ####### BEGIN CHECK ######
PKG_CHECK_EXISTS([libxml-2.0 $1], [
dnl ##########################

libxml2_libs_autodetect=no
if test -z "${LIBXML2_LIBS}"; then
	LIBXML2_LIBS="`${PKG_CONFIG} --libs-only-l libxml-2.0`"
	libxml2_libs_autodetect=yes
fi

ax_check_libxml2_save_CFLAGS="${CFLAGS}"
ax_check_libxml2_save_CPPFLAGS="${CPPFLAGS}"
ax_check_libxml2_save_LDFLAGS="${LDFLAGS}"
ax_check_libxml2_save_LIBS="${LIBS}"
AC_LANG_PUSH([C])
CFLAGS="${CFLAGS} ${LIBXML2_CFLAGS}"
CPPFLAGS="${CPPFLAGS} ${LIBXML2_CPPFLAGS}"
LDFLAGS="${LDFLAGS} ${LIBXML2_LDFLAGS}"
LIBS="${LIBXML2_LIBS} ${LIBS}"
AC_CHECK_HEADER([libxml/parser.h],
[
	AC_MSG_CHECKING([if libxml2 works])
	AC_LINK_IFELSE(
		[AC_LANG_PROGRAM(
		[[
		  #include <stdlib.h>
		  #include <libxml/parser.h>
		]],
		[[
		  xmlParseFile(NULL);
		]])],
		[
		  AC_MSG_RESULT([yes])
		  local_cv_have_lib_libxml2=yes
		],
		[
		  AC_MSG_RESULT([no])
		  if test x"${libxml2_libs_autodetect}" = "xyes"; then
			LIBXML2_LIBS="`${PKG_CONFIG} --static --libs-only-l libxml-2.0`"
			LIBS="${LIBXML2_LIBS} ${ax_check_libxml2_save_LIBS}"
			AC_MSG_CHECKING([if libxml2 works with explicit dependencies])
			AC_LINK_IFELSE(
				[AC_LANG_PROGRAM(
				[[
				  #include <stdlib.h>
				  #include <libxml/parser.h>
				]],
				[[
				  xmlParseFile(NULL);
				]])],
				[
				  AC_MSG_RESULT([yes])
				  local_cv_have_lib_libxml2=yes
				],
				[
				  AC_MSG_RESULT([no])
				]
			)
		  fi
		]
	)
])
CFLAGS="${ax_check_libxml2_save_CFLAGS}"
CPPFLAGS="${ax_check_libxml2_save_CPPFLAGS}"
LDFLAGS="${ax_check_libxml2_save_LDFLAGS}"
LIBS="${ax_check_libxml2_save_LIBS}"
AC_LANG_POP([C])

dnl ####### END CHECK ########
], [])
dnl ##########################

fi						# want_libxml2 != no

])

AC_MSG_CHECKING([for libxml2 $1])
if test x"${local_cv_have_lib_libxml2}" = "xyes"; then
	AC_MSG_RESULT([yes])
	:
	$2
else
	AC_MSG_RESULT([no])
	:
	$3
fi

])