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    1 # pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
    2 # serial 12 (pkg-config-@VERSION@)
    3 
    4 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
    5 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
    6 dnl
    7 dnl This program is free software; you can redistribute it and/or modify
    8 dnl it under the terms of the GNU General Public License as published by
    9 dnl the Free Software Foundation; either version 2 of the License, or
   10 dnl (at your option) any later version.
   11 dnl
   12 dnl This program is distributed in the hope that it will be useful, but
   13 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
   14 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   15 dnl General Public License for more details.
   16 dnl
   17 dnl You should have received a copy of the GNU General Public License
   18 dnl along with this program; if not, write to the Free Software
   19 dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   20 dnl 02111-1307, USA.
   21 dnl
   22 dnl As a special exception to the GNU General Public License, if you
   23 dnl distribute this file as part of a program that contains a
   24 dnl configuration script generated by Autoconf, you may include it under
   25 dnl the same distribution terms that you use for the rest of that
   26 dnl program.
   27 
   28 dnl PKG_PREREQ(MIN-VERSION)
   29 dnl -----------------------
   30 dnl Since: 0.29
   31 dnl
   32 dnl Verify that the version of the pkg-config macros are at least
   33 dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
   34 dnl installed version of pkg-config, this checks the developer's version
   35 dnl of pkg.m4 when generating configure.
   36 dnl
   37 dnl To ensure that this macro is defined, also add:
   38 dnl m4_ifndef([PKG_PREREQ],
   39 dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
   40 dnl
   41 dnl See the "Since" comment for each macro you use to see what version
   42 dnl of the macros you require.
   43 m4_defun([PKG_PREREQ],
   44 [m4_define([PKG_MACROS_VERSION], [@VERSION@])
   45 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
   46     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
   47 ])dnl PKG_PREREQ
   48 
   49 dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
   50 dnl ----------------------------------
   51 dnl Since: 0.16
   52 dnl
   53 dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
   54 dnl first found in the path. Checks that the version of pkg-config found
   55 dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
   56 dnl used since that's the first version where most current features of
   57 dnl pkg-config existed.
   58 AC_DEFUN([PKG_PROG_PKG_CONFIG],
   59 [m4_pattern_forbid([^_?PKG_[A-Z_]+$])
   60 m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
   61 m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
   62 AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
   63 AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
   64 AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
   65 
   66 if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
   67 	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
   68 fi
   69 if test -n "$PKG_CONFIG"; then
   70 	_pkg_min_version=m4_default([$1], [0.9.0])
   71 	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
   72 	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
   73 		AC_MSG_RESULT([yes])
   74 	else
   75 		AC_MSG_RESULT([no])
   76 		PKG_CONFIG=""
   77 	fi
   78 fi[]dnl
   79 ])dnl PKG_PROG_PKG_CONFIG
   80 
   81 dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
   82 dnl -------------------------------------------------------------------
   83 dnl Since: 0.18
   84 dnl
   85 dnl Check to see whether a particular set of modules exists. Similar to
   86 dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
   87 dnl
   88 dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
   89 dnl only at the first occurence in configure.ac, so if the first place
   90 dnl it's called might be skipped (such as if it is within an "if", you
   91 dnl have to call PKG_CHECK_EXISTS manually
   92 AC_DEFUN([PKG_CHECK_EXISTS],
   93 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
   94 if test -n "$PKG_CONFIG" && \
   95     AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
   96   m4_default([$2], [:])
   97 m4_ifvaln([$3], [else
   98   $3])dnl
   99 fi])
  100 
  101 dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
  102 dnl ---------------------------------------------
  103 dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
  104 dnl pkg_failed based on the result.
  105 m4_define([_PKG_CONFIG],
  106 [if test -n "$$1"; then
  107     pkg_cv_[]$1="$$1"
  108  elif test -n "$PKG_CONFIG"; then
  109     PKG_CHECK_EXISTS([$3],
  110                      [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
  111 		      test "x$?" != "x0" && pkg_failed=yes ],
  112 		     [pkg_failed=yes])
  113  else
  114     pkg_failed=untried
  115 fi[]dnl
  116 ])dnl _PKG_CONFIG
  117 
  118 dnl _PKG_SHORT_ERRORS_SUPPORTED
  119 dnl ---------------------------
  120 dnl Internal check to see if pkg-config supports short errors.
  121 AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
  122 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])
  123 if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
  124         _pkg_short_errors_supported=yes
  125 else
  126         _pkg_short_errors_supported=no
  127 fi[]dnl
  128 ])dnl _PKG_SHORT_ERRORS_SUPPORTED
  129 
  130 
  131 dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
  132 dnl   [ACTION-IF-NOT-FOUND])
  133 dnl --------------------------------------------------------------
  134 dnl Since: 0.4.0
  135 dnl
  136 dnl Note that if there is a possibility the first call to
  137 dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
  138 dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
  139 AC_DEFUN([PKG_CHECK_MODULES],
  140 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  141 AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
  142 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
  143 
  144 pkg_failed=no
  145 AC_MSG_CHECKING([for $2])
  146 
  147 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
  148 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
  149 
  150 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
  151 and $1[]_LIBS to avoid the need to call pkg-config.
  152 See the pkg-config man page for more details.])
  153 
  154 if test $pkg_failed = yes; then
  155         AC_MSG_RESULT([no])
  156         _PKG_SHORT_ERRORS_SUPPORTED
  157         if test $_pkg_short_errors_supported = yes; then
  158 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
  159         else
  160 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
  161         fi
  162 	# Put the nasty error message in config.log where it belongs
  163 	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
  164 
  165 	m4_default([$4], [AC_MSG_ERROR(
  166 [Package requirements ($2) were not met:
  167 
  168 $$1_PKG_ERRORS
  169 
  170 Consider adjusting the PKG_CONFIG_PATH environment variable if you
  171 installed software in a non-standard prefix.
  172 
  173 _PKG_TEXT])[]dnl
  174         ])
  175 elif test $pkg_failed = untried; then
  176         AC_MSG_RESULT([no])
  177 	m4_default([$4], [AC_MSG_FAILURE(
  178 [The pkg-config script could not be found or is too old.  Make sure it
  179 is in your PATH or set the PKG_CONFIG environment variable to the full
  180 path to pkg-config.
  181 
  182 _PKG_TEXT
  183 
  184 To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
  185         ])
  186 else
  187 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
  188 	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
  189         AC_MSG_RESULT([yes])
  190 	$3
  191 fi[]dnl
  192 ])dnl PKG_CHECK_MODULES
  193 
  194 
  195 dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
  196 dnl   [ACTION-IF-NOT-FOUND])
  197 dnl ---------------------------------------------------------------------
  198 dnl Since: 0.29
  199 dnl
  200 dnl Checks for existence of MODULES and gathers its build flags with
  201 dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
  202 dnl and VARIABLE-PREFIX_LIBS from --libs.
  203 dnl
  204 dnl Note that if there is a possibility the first call to
  205 dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
  206 dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
  207 dnl configure.ac.
  208 AC_DEFUN([PKG_CHECK_MODULES_STATIC],
  209 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  210 _save_PKG_CONFIG=$PKG_CONFIG
  211 PKG_CONFIG="$PKG_CONFIG --static"
  212 PKG_CHECK_MODULES($@)
  213 PKG_CONFIG=$_save_PKG_CONFIG[]dnl
  214 ])dnl PKG_CHECK_MODULES_STATIC
  215 
  216 
  217 dnl PKG_INSTALLDIR([DIRECTORY])
  218 dnl -------------------------
  219 dnl Since: 0.27
  220 dnl
  221 dnl Substitutes the variable pkgconfigdir as the location where a module
  222 dnl should install pkg-config .pc files. By default the directory is
  223 dnl $libdir/pkgconfig, but the default can be changed by passing
  224 dnl DIRECTORY. The user can override through the --with-pkgconfigdir
  225 dnl parameter.
  226 AC_DEFUN([PKG_INSTALLDIR],
  227 [m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
  228 m4_pushdef([pkg_description],
  229     [pkg-config installation directory @<:@]pkg_default[@:>@])
  230 AC_ARG_WITH([pkgconfigdir],
  231     [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
  232     [with_pkgconfigdir=]pkg_default)
  233 AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
  234 m4_popdef([pkg_default])
  235 m4_popdef([pkg_description])
  236 ])dnl PKG_INSTALLDIR
  237 
  238 
  239 dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
  240 dnl --------------------------------
  241 dnl Since: 0.27
  242 dnl
  243 dnl Substitutes the variable noarch_pkgconfigdir as the location where a
  244 dnl module should install arch-independent pkg-config .pc files. By
  245 dnl default the directory is $datadir/pkgconfig, but the default can be
  246 dnl changed by passing DIRECTORY. The user can override through the
  247 dnl --with-noarch-pkgconfigdir parameter.
  248 AC_DEFUN([PKG_NOARCH_INSTALLDIR],
  249 [m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
  250 m4_pushdef([pkg_description],
  251     [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
  252 AC_ARG_WITH([noarch-pkgconfigdir],
  253     [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
  254     [with_noarch_pkgconfigdir=]pkg_default)
  255 AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
  256 m4_popdef([pkg_default])
  257 m4_popdef([pkg_description])
  258 ])dnl PKG_NOARCH_INSTALLDIR
  259 
  260 
  261 dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
  262 dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
  263 dnl -------------------------------------------
  264 dnl Since: 0.28
  265 dnl
  266 dnl Retrieves the value of the pkg-config variable for the given module.
  267 AC_DEFUN([PKG_CHECK_VAR],
  268 [AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
  269 AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
  270 
  271 _PKG_CONFIG([$1], [variable="][$3]["], [$2])
  272 AS_VAR_COPY([$1], [pkg_cv_][$1])
  273 
  274 AS_VAR_IF([$1], [""], [$5], [$4])dnl
  275 ])dnl PKG_CHECK_VAR