# pkg.m4 - Macros to locate and utilise pkg-config.            -*- Autoconf -*-

# 

# Copyright © 2004 Scott James Remnant <scott@netsplit.com>.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#

# As a special exception to the GNU General Public License, if you

# distribute this file as part of a program that contains a

# configuration script generated by Autoconf, you may include it under

# the same distribution terms that you use for the rest of that program.

# PKG_PROG_PKG_CONFIG([MIN-VERSION])

# ----------------------------------

AC_DEFUN([PKG_PROG_PKG_CONFIG],

[m4_pattern_forbid([^_?PKG_[A-Z_]+$])

m4_pattern_allow([^PKG_CONFIG(_PATH)?$])

AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])dnl

if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then

	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])

fi

if test -n "$PKG_CONFIG"; then

	_pkg_min_version=m4_ifval([$1], [$1], [0.9.0])

	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])

	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then

		AC_MSG_RESULT([yes])

	else

		AC_MSG_RESULT([no])

		PKG_CONFIG=""

	fi

fi[]dnl

])# PKG_PROG_PKG_CONFIG

# _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])

# ---------------------------------------------

m4_define([_PKG_CONFIG],

[if test "x$ac_cv_env_[]$1[]_set" = "xset"; then

	pkg_cv_[]$1=$ac_cv_env_[]$1[]_value

elif test -n "$PKG_CONFIG"; then

	if AC_RUN_LOG([$PKG_CONFIG --exists "$3" >/dev/null 2>&1]); then

		pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`

	else

		pkg_failed=yes

	fi

else

	pkg_failed=untried

fi[]dnl

])# _PKG_CONFIG

# PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],

# [ACTION-IF-NOT-FOUND])

#

#

# Note that if there is a possibility the first call to

# PKG_CHECK_MODULES might not happen, you should be sure to include an

# explicit call to PKG_PROG_PKG_CONFIG in your configure.in

#

#

# --------------------------------------------------------------

AC_DEFUN([PKG_CHECK_MODULES],

[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl

AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl

AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl

pkg_failed=no

AC_CACHE_CHECK([for $1][_CFLAGS], [pkg_cv_][$1][_CFLAGS],

	[_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])])

AC_CACHE_CHECK([for $1][_LIBS], [pkg_cv_][$1][_LIBS],

	[_PKG_CONFIG([$1][_LIBS], [libs], [$2])])

if test $pkg_failed = yes; then

	$1[]_PKG_ERRORS=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`

	# Put the nasty error message in config.log where it belongs

	echo "$$1[]_PKG_ERRORS" 1>&AS_MESSAGE_LOG_FD

	ifelse([$4], , [AC_MSG_ERROR(dnl

[Package requirements ($2) were not met.

Consider adjusting the PKG_CONFIG_PATH environment variable if you

installed software in a non-standard prefix.

Alternatively you may set the $1_CFLAGS and $1_LIBS environment variables

to avoid the need to call pkg-config.  See the pkg-config man page for

more details.])],

		[$4])

elif test $pkg_failed = untried; then

	ifelse([$4], , [AC_MSG_FAILURE(dnl

[The pkg-config script could not be found or is too old.  Make sure it

is in your PATH or set the PKG_CONFIG environment variable to the full

path to pkg-config.

Alternatively you may set the $1_CFLAGS and $1_LIBS environment variables

to avoid the need to call pkg-config.  See the pkg-config man page for

more details.

To get pkg-config, see <http://www.freedesktop.org/software/pkgconfig>.])],

		[$4])

else

	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS

	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS

	ifelse([$3], , :, [$3])

fi[]dnl

])# PKG_CHECK_MODULES