# 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_default([$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_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])

#

# Check to see whether a particular set of modules exists.  Similar

# to PKG_CHECK_MODULES(), but does not set variables or print errors.

#

#

# Similar to PKG_CHECK_MODULES, make sure that the first instance of

# this or PKG_CHECK_MODULES is called, or make sure to call

# PKG_CHECK_EXISTS manually

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

AC_DEFUN([PKG_CHECK_EXISTS],

[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl

if test -n "$PKG_CONFIG" && \

    AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then

  m4_ifval([$2], [$2], [:])

m4_ifvaln([$3], [else

  $3])dnl

fi])

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

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

m4_define([_PKG_CONFIG],

[if test -n "$PKG_CONFIG"; then

    if test -n "$$1"; then

        pkg_cv_[]$1="$$1"

    else

        PKG_CHECK_EXISTS([$3],

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

			 [pkg_failed=yes])

    fi

else

	pkg_failed=untried

fi[]dnl

])# _PKG_CONFIG

# _PKG_SHORT_ERRORS_SUPPORTED

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

AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],

[AC_REQUIRE([PKG_PROG_PKG_CONFIG])

if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then

        _pkg_short_errors_supported=yes

else

        _pkg_short_errors_supported=no

fi[]dnl

])# _PKG_SHORT_ERRORS_SUPPORTED

# 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.ac

#

#

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

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_MSG_CHECKING([for $1])

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

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

m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS

and $1[]_LIBS to avoid the need to call pkg-config.

See the pkg-config man page for more details.])

if test $pkg_failed = yes; then

        _PKG_SHORT_ERRORS_SUPPORTED

        if test $_pkg_short_errors_supported = yes; then

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

        else 

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

        fi

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

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

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

[Package requirements ($2) were not met:

$$1_PKG_ERRORS

Consider adjusting the PKG_CONFIG_PATH environment variable if you

installed software in a non-standard prefix.

_PKG_TEXT

])],

		[AC_MSG_RESULT([no])

                $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.

_PKG_TEXT

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

        AC_MSG_RESULT([yes])

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

fi[]dnl

])# PKG_CHECK_MODULES