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

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