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[diderot] Annotation of /examples/config/pkg.m4
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Annotation of /examples/config/pkg.m4

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1 : jhr 1914 # pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
2 :     # serial 1 (pkg-config-0.24)
3 :     #
4 :     # Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
5 :     #
6 :     # This program is free software; you can redistribute it and/or modify
7 :     # it under the terms of the GNU General Public License as published by
8 :     # the Free Software Foundation; either version 2 of the License, or
9 :     # (at your option) any later version.
10 :     #
11 :     # This program is distributed in the hope that it will be useful, but
12 :     # WITHOUT ANY WARRANTY; without even the implied warranty of
13 :     # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 :     # General Public License for more details.
15 :     #
16 :     # You should have received a copy of the GNU General Public License
17 :     # along with this program; if not, write to the Free Software
18 :     # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 :     #
20 :     # As a special exception to the GNU General Public License, if you
21 :     # distribute this file as part of a program that contains a
22 :     # configuration script generated by Autoconf, you may include it under
23 :     # the same distribution terms that you use for the rest of that program.
24 :    
25 :     # PKG_PROG_PKG_CONFIG([MIN-VERSION])
26 :     # ----------------------------------
27 :     AC_DEFUN([PKG_PROG_PKG_CONFIG],
28 :     [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
29 :     m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
30 :     m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
31 :     AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
32 :     AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
33 :     AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
34 :    
35 :     if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
36 :     AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
37 :     fi
38 :     if test -n "$PKG_CONFIG"; then
39 :     _pkg_min_version=m4_default([$1], [0.9.0])
40 :     AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
41 :     if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
42 :     AC_MSG_RESULT([yes])
43 :     else
44 :     AC_MSG_RESULT([no])
45 :     PKG_CONFIG=""
46 :     fi
47 :     fi[]dnl
48 :     ])# PKG_PROG_PKG_CONFIG
49 :    
50 :     # PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
51 :     #
52 :     # Check to see whether a particular set of modules exists. Similar
53 :     # to PKG_CHECK_MODULES(), but does not set variables or print errors.
54 :     #
55 :     # Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
56 :     # only at the first occurence in configure.ac, so if the first place
57 :     # it's called might be skipped (such as if it is within an "if", you
58 :     # have to call PKG_CHECK_EXISTS manually
59 :     # --------------------------------------------------------------
60 :     AC_DEFUN([PKG_CHECK_EXISTS],
61 :     [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
62 :     if test -n "$PKG_CONFIG" && \
63 :     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
64 :     m4_default([$2], [:])
65 :     m4_ifvaln([$3], [else
66 :     $3])dnl
67 :     fi])
68 :    
69 :     # _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
70 :     # ---------------------------------------------
71 :     m4_define([_PKG_CONFIG],
72 :     [if test -n "$$1"; then
73 :     pkg_cv_[]$1="$$1"
74 :     elif test -n "$PKG_CONFIG"; then
75 :     PKG_CHECK_EXISTS([$3],
76 :     [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
77 :     test "x$?" != "x0" && pkg_failed=yes ],
78 :     [pkg_failed=yes])
79 :     else
80 :     pkg_failed=untried
81 :     fi[]dnl
82 :     ])# _PKG_CONFIG
83 :    
84 :     # _PKG_SHORT_ERRORS_SUPPORTED
85 :     # -----------------------------
86 :     AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
87 :     [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
88 :     if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
89 :     _pkg_short_errors_supported=yes
90 :     else
91 :     _pkg_short_errors_supported=no
92 :     fi[]dnl
93 :     ])# _PKG_SHORT_ERRORS_SUPPORTED
94 :    
95 :    
96 :     # PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
97 :     # [ACTION-IF-NOT-FOUND])
98 :     #
99 :     #
100 :     # Note that if there is a possibility the first call to
101 :     # PKG_CHECK_MODULES might not happen, you should be sure to include an
102 :     # explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
103 :     #
104 :     #
105 :     # --------------------------------------------------------------
106 :     AC_DEFUN([PKG_CHECK_MODULES],
107 :     [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
108 :     AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
109 :     AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
110 :    
111 :     pkg_failed=no
112 :     AC_MSG_CHECKING([for $1])
113 :    
114 :     _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
115 :     _PKG_CONFIG([$1][_LIBS], [libs], [$2])
116 :    
117 :     m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
118 :     and $1[]_LIBS to avoid the need to call pkg-config.
119 :     See the pkg-config man page for more details.])
120 :    
121 :     if test $pkg_failed = yes; then
122 :     AC_MSG_RESULT([no])
123 :     _PKG_SHORT_ERRORS_SUPPORTED
124 :     if test $_pkg_short_errors_supported = yes; then
125 :     $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
126 :     else
127 :     $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
128 :     fi
129 :     # Put the nasty error message in config.log where it belongs
130 :     echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
131 :    
132 :     m4_default([$4], [AC_MSG_ERROR(
133 :     [Package requirements ($2) were not met:
134 :    
135 :     $$1_PKG_ERRORS
136 :    
137 :     Consider adjusting the PKG_CONFIG_PATH environment variable if you
138 :     installed software in a non-standard prefix.
139 :    
140 :     _PKG_TEXT])[]dnl
141 :     ])
142 :     elif test $pkg_failed = untried; then
143 :     AC_MSG_RESULT([no])
144 :     m4_default([$4], [AC_MSG_FAILURE(
145 :     [The pkg-config script could not be found or is too old. Make sure it
146 :     is in your PATH or set the PKG_CONFIG environment variable to the full
147 :     path to pkg-config.
148 :    
149 :     _PKG_TEXT
150 :    
151 :     To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
152 :     ])
153 :     else
154 :     $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
155 :     $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
156 :     AC_MSG_RESULT([yes])
157 :     $3
158 :     fi[]dnl
159 :     ])# PKG_CHECK_MODULES

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