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   1 # 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_]+$])
  29 m4_pattern_allow([^PKG_CONFIG(_PATH)?$])
  30 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
  31 AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
  32 AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
  33
  34 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
  35         AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
  36 fi
  37 if test -n "$PKG_CONFIG"; then
  38         _pkg_min_version=m4_default([$1], [0.9.0])
  39         AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
  40         if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
  41                 AC_MSG_RESULT([yes])
  42         else
  43                 AC_MSG_RESULT([no])
  44                 PKG_CONFIG=""
  45         fi
  46 fi[]dnl
  47 ])# PKG_PROG_PKG_CONFIG
  48
  49 # PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  50 #
  51 # Check to see whether a particular set of modules exists.  Similar
  52 # to PKG_CHECK_MODULES(), but does not set variables or print errors.
  53 #
  54 # Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  55 # only at the first occurence in configure.ac, so if the first place
  56 # it's called might be skipped (such as if it is within an "if", you
  57 # have to call PKG_CHECK_EXISTS manually
  58 # --------------------------------------------------------------
  59 AC_DEFUN([PKG_CHECK_EXISTS],
  60 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  61 if test -n "$PKG_CONFIG" && \
  62     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
  63   m4_default([$2], [:])
  64 m4_ifvaln([$3], [else
  65   $3])dnl
  66 fi])
  67
  68 # _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
  69 # ---------------------------------------------
  70 m4_define([_PKG_CONFIG],
  71 [if test -n "$$1"; then
  72     pkg_cv_[]$1="$$1"
  73  elif test -n "$PKG_CONFIG"; then
  74     PKG_CHECK_EXISTS([$3],
  75                      [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`],
  76                      [pkg_failed=yes])
  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         AC_MSG_RESULT([no])
 121         _PKG_SHORT_ERRORS_SUPPORTED
 122         if test $_pkg_short_errors_supported = yes; then
 123                 $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors "$2" 2>&1`
 124         else
 125                 $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors "$2" 2>&1`
 126         fi
 127         # Put the nasty error message in config.log where it belongs
 128         echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
 129
 130         m4_default([$4], [AC_MSG_ERROR(
 131 [Package requirements ($2) were not met:
 132
 133 $$1_PKG_ERRORS
 134
 135 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 136 installed software in a non-standard prefix.
 137
 138 _PKG_TEXT])
 139         ])
 140 elif test $pkg_failed = untried; then
 141         AC_MSG_RESULT([no])
 142         m4_default([$4], [AC_MSG_FAILURE(
 143 [The pkg-config script could not be found or is too old.  Make sure it
 144 is in your PATH or set the PKG_CONFIG environment variable to the full
 145 path to pkg-config.
 146
 147 _PKG_TEXT
 148
 149 To get pkg-config, see <http://pkg-config.freedesktop.org/>.])
 150         ])
 151 else
 152         $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
 153         $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
 154         AC_MSG_RESULT([yes])
 155         $3
 156 fi[]dnl
 157 ])# PKG_CHECK_MODULES