acinclude/pkg.m4
changeset 425 d39ef8d550b6
equal deleted inserted replaced
424:2cd7840dc8c4 425:d39ef8d550b6
       
     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 		[AC_MSG_RESULT([no])
       
   140                 $4])
       
   141 elif test $pkg_failed = untried; then
       
   142 	ifelse([$4], , [AC_MSG_FAILURE(dnl
       
   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 		[$4])
       
   151 else
       
   152 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
       
   153 	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
       
   154         AC_MSG_RESULT([yes])
       
   155 	ifelse([$3], , :, [$3])
       
   156 fi[]dnl
       
   157 ])# PKG_CHECK_MODULES