pkg.m4 revision 574:b66c81dfa291 
1# pkg.m4 - Macros to locate and utilise pkg-config.            -*- Autoconf -*-
2
3#
4# Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
5# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6#
7# This code is free software; you can redistribute it and/or modify it
8# under the terms of the GNU General Public License version 2 only, as
9# published by the Free Software Foundation.  Oracle designates this
10# particular file as subject to the "Classpath" exception as provided
11# by Oracle in the LICENSE file that accompanied this code.
12#
13# This code is distributed in the hope that it will be useful, but WITHOUT
14# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16# version 2 for more details (a copy is included in the LICENSE file that
17# accompanied this code).
18#
19# You should have received a copy of the GNU General Public License version
20# 2 along with this work; if not, write to the Free Software Foundation,
21# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
22#
23# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
24# or visit www.oracle.com if you need additional information or have any
25# questions.
26#
27
28# 
29# Copyright �� 2004 Scott James Remnant <scott@netsplit.com>.
30#
31# This program is free software; you can redistribute it and/or modify
32# it under the terms of the GNU General Public License as published by
33# the Free Software Foundation; either version 2 of the License, or
34# (at your option) any later version.
35#
36# This program is distributed in the hope that it will be useful, but
37# WITHOUT ANY WARRANTY; without even the implied warranty of
38# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
39# General Public License for more details.
40#
41# You should have received a copy of the GNU General Public License
42# along with this program; if not, write to the Free Software
43# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
44#
45# As a special exception to the GNU General Public License, if you
46# distribute this file as part of a program that contains a
47# configuration script generated by Autoconf, you may include it under
48# the same distribution terms that you use for the rest of that program.
49
50# PKG_PROG_PKG_CONFIG([MIN-VERSION])
51# ----------------------------------
52AC_DEFUN([PKG_PROG_PKG_CONFIG],
53[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
54m4_pattern_allow([^PKG_CONFIG(_PATH)?$])
55AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])dnl
56if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
57	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
58fi
59if test -n "$PKG_CONFIG"; then
60	_pkg_min_version=m4_default([$1], [0.9.0])
61	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
62	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
63		AC_MSG_RESULT([yes])
64	else
65		AC_MSG_RESULT([no])
66		PKG_CONFIG=""
67	fi
68		
69fi[]dnl
70])# PKG_PROG_PKG_CONFIG
71
72# PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
73#
74# Check to see whether a particular set of modules exists.  Similar
75# to PKG_CHECK_MODULES(), but does not set variables or print errors.
76#
77#
78# Similar to PKG_CHECK_MODULES, make sure that the first instance of
79# this or PKG_CHECK_MODULES is called, or make sure to call
80# PKG_CHECK_EXISTS manually
81# --------------------------------------------------------------
82AC_DEFUN([PKG_CHECK_EXISTS],
83[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
84if test -n "$PKG_CONFIG" && \
85    AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
86  m4_ifval([$2], [$2], [:])
87m4_ifvaln([$3], [else
88  $3])dnl
89fi])
90
91
92# _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
93# ---------------------------------------------
94m4_define([_PKG_CONFIG],
95[if test -n "$$1"; then
96    pkg_cv_[]$1="$$1"
97 elif test -n "$PKG_CONFIG"; then
98    PKG_CHECK_EXISTS([$3],
99                     [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`],
100		     [pkg_failed=yes])
101 else
102    pkg_failed=untried
103fi[]dnl
104])# _PKG_CONFIG
105
106# _PKG_SHORT_ERRORS_SUPPORTED
107# -----------------------------
108AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
109[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
110if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
111        _pkg_short_errors_supported=yes
112else
113        _pkg_short_errors_supported=no
114fi[]dnl
115])# _PKG_SHORT_ERRORS_SUPPORTED
116
117
118# PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
119# [ACTION-IF-NOT-FOUND])
120#
121#
122# Note that if there is a possibility the first call to
123# PKG_CHECK_MODULES might not happen, you should be sure to include an
124# explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
125#
126#
127# --------------------------------------------------------------
128AC_DEFUN([PKG_CHECK_MODULES],
129[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
130AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
131AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
132
133pkg_failed=no
134AC_MSG_CHECKING([for $1])
135
136_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
137_PKG_CONFIG([$1][_LIBS], [libs], [$2])
138
139m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
140and $1[]_LIBS to avoid the need to call pkg-config.
141See the pkg-config man page for more details.])
142
143if test $pkg_failed = yes; then
144        _PKG_SHORT_ERRORS_SUPPORTED
145        if test $_pkg_short_errors_supported = yes; then
146	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors "$2" 2>&1`
147        else 
148	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors "$2" 2>&1`
149        fi
150	# Put the nasty error message in config.log where it belongs
151	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
152
153	ifelse([$4], , [AC_MSG_ERROR(dnl
154[Package requirements ($2) were not met:
155
156$$1_PKG_ERRORS
157
158Consider adjusting the PKG_CONFIG_PATH environment variable if you
159installed software in a non-standard prefix.
160
161_PKG_TEXT
162])],
163		[AC_MSG_RESULT([no])
164                $4])
165elif test $pkg_failed = untried; then
166	ifelse([$4], , [AC_MSG_FAILURE(dnl
167[The pkg-config script could not be found or is too old.  Make sure it
168is in your PATH or set the PKG_CONFIG environment variable to the full
169path to pkg-config.
170
171_PKG_TEXT
172
173To get pkg-config, see <http://pkg-config.freedesktop.org/>.])],
174		[$4])
175else
176	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
177	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
178        AC_MSG_RESULT([yes])
179	ifelse([$3], , :, [$3])
180fi[]dnl
181])# PKG_CHECK_MODULES
182