build/aclocal/pkg.m4

   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 # ----------------------------------
  26 AC_DEFUN([PKG_PROG_PKG_CONFIG],
  27 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
  28 m4_pattern_allow([^PKG_CONFIG(_PATH)?$])
  29 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])dnl
  30 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
  31         AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
  32 fi
  33 if test -n "$PKG_CONFIG"; then
  34         _pkg_min_version=m4_default([$1], [0.9.0])
  35         AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
  36         if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
  37                 AC_MSG_RESULT([yes])
  38         else
  39                 AC_MSG_RESULT([no])
  40                 PKG_CONFIG=""
  41         fi
  42
  43 fi[]dnl
  44 ])# PKG_PROG_PKG_CONFIG
  45
  46 # PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  47 #
  48 # Check to see whether a particular set of modules exists.  Similar
  49 # to PKG_CHECK_MODULES(), but does not set variables or print errors.
  50 #
  51 #
  52 # Similar to PKG_CHECK_MODULES, make sure that the first instance of
  53 # this or PKG_CHECK_MODULES is called, or make sure to call
  54 # PKG_CHECK_EXISTS manually
  55 # --------------------------------------------------------------
  56 AC_DEFUN([PKG_CHECK_EXISTS],
  57 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  58 if test -n "$PKG_CONFIG" && \
  59     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
  60   m4_ifval([$2], [$2], [:])
  61 m4_ifvaln([$3], [else
  62   $3])dnl
  63 fi])
  64
  65
  66 # _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
  67 # ---------------------------------------------
  68 m4_define([_PKG_CONFIG],
  69 [if test -n "$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
  77 else
  78         pkg_failed=untried
  79 fi[]dnl
  80 ])# _PKG_CONFIG
  81
  82 # _PKG_SHORT_ERRORS_SUPPORTED
  83 # -----------------------------
  84 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
  85 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  86 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
  87         _pkg_short_errors_supported=yes
  88 else
  89         _pkg_short_errors_supported=no
  90 fi[]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 # --------------------------------------------------------------
 104 AC_DEFUN([PKG_CHECK_MODULES],
 105 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
 106 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
 107 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
 108
 109 pkg_failed=no
 110 AC_MSG_CHECKING([for $1])
 111
 112 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 113 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
 114
 115 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
 116 and $1[]_LIBS to avoid the need to call pkg-config.
 117 See the pkg-config man page for more details.])
 118
 119 if 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
 127         echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
 128
 129         ifelse([$4], , [AC_MSG_ERROR(dnl
 130 [Package requirements ($2) were not met:
 131
 132 $$1_PKG_ERRORS
 133
 134 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 135 installed software in a non-standard prefix.
 136
 137 _PKG_TEXT
 138 ])],
 139                 [$4])
 140 elif test $pkg_failed = untried; then
 141         ifelse([$4], , [AC_MSG_FAILURE(dnl
 142 [The pkg-config script could not be found or is too old.  Make sure it
 143 is in your PATH or set the PKG_CONFIG environment variable to the full
 144 path to pkg-config.
 145
 146 _PKG_TEXT
 147
 148 To get pkg-config, see <http://www.freedesktop.org/software/pkgconfig>.])],
 149                 [$4])
 150 else
 151         $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
 152         $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
 153         AC_MSG_RESULT([yes])
 154         ifelse([$3], , :, [$3])
 155 fi[]dnl
 156 ])# PKG_CHECK_MODULES