acinclude/pkg.m4
author Ozkan Sezer <sezeroz@gmail.com>
Sat, 13 Oct 2018 15:02:56 +0300
changeset 596 4b70bfe18fb7
parent 214 2de2495e5767
permissions -rw-r--r--
fix build against libpng-1.5.x versions.
     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