Mailing List Archive

* m4/pkg.m4: New.
* src/gpg-error.m4: use pkg-config if enabled.

--

libgpg-error installs pkg-config configuration file, it even become the
source of truth for the gpg-error-config script.

All gpg-error.m4 consumers can leverage pkg-config as well. In order to
keep backward compatibility, the pkg-config variant will be used only if
enable_pkg_config is set to yes. if pkg-config not found or pkg-config
configuration is missing it will fallback to current implementation.

Apart of being a standard/popular method, pkg-config has advantages over
using executable config scripts:

* Simplicity, built for the task.

* Good integration into autoconf using the pkg.m4 macros, enables the
detection of pkg-config, fallback if missing and handle the
interaction, including override settings by environment.

* Support for multilib configurations as configuration is installed per
library setup, unlike a common script that is installed at bindir.

* Cross-compile support, support sysroot and does not require to execute
anything from sysroot.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
---
m4/pkg.m4 | 343 +++++++++++++++++++++++++++++++++++++++++++++++
src/gpg-error.m4 | 149 +++++++++++---------
2 files changed, 426 insertions(+), 66 deletions(-)
create mode 100644 m4/pkg.m4

diff --git a/src/gpg-error.m4 b/src/gpg-error.m4
index 0564219..d3a0ad7 100644
--- a/src/gpg-error.m4
+++ b/src/gpg-error.m4
@@ -26,6 +26,7 @@ dnl is added to the gpg_config_script_warn variable.
dnl
AC_DEFUN([AM_PATH_GPG_ERROR],
[ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([PKG_PROG_PKG_CONFIG])
gpg_error_config_prefix=""
dnl --with-libgpg-error-prefix=PFX is the preferred name for this option,
dnl since that is consistent with how our three siblings use the directory/
@@ -40,64 +41,79 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
dnl but do not document this old, inconsistently-named option.
AC_ARG_WITH(gpg-error-prefix,,
[gpg_error_config_prefix="$withval"])
+ min_gpg_error_version=ifelse([$1], ,0.0,$1)

- if test x"${GPG_ERROR_CONFIG}" = x ; then
- if test x"${gpg_error_config_prefix}" != x ; then
- GPG_ERROR_CONFIG="${gpg_error_config_prefix}/bin/gpg-error-config"
- else
- case "${SYSROOT}" in
- /*)
- if test -x "${SYSROOT}/bin/gpg-error-config" ; then
- GPG_ERROR_CONFIG="${SYSROOT}/bin/gpg-error-config"
- fi
- ;;
- '')
- ;;
- *)
- AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
- ;;
- esac
- fi
+ gpg_error_use_config=yes
+ if test x"${enable_pkg_config}" = xyes; then
+ PKG_CHECK_MODULES(
+ [GPG_ERROR],
+ [gpg-error >= $min_gpg_error_version],
+ [
+ gpg_error_use_config=no
+ PKG_CHECK_VAR([GPG_ERROR_MT_CFLAGS], [gpg-error], [mtcflags])
+ PKG_CHECK_VAR([GPG_ERROR_MT_LIBS], [gpg-error], [mtlibs])
+ ],
+ [:]
+ )
fi

- AC_PATH_PROG(GPG_ERROR_CONFIG, gpg-error-config, no)
- min_gpg_error_version=ifelse([$1], ,0.0,$1)
- AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
- ok=no
- if test "$GPG_ERROR_CONFIG" != "no" \
- && test -f "$GPG_ERROR_CONFIG" ; then
- req_major=`echo $min_gpg_error_version | \
- sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
- req_minor=`echo $min_gpg_error_version | \
- sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
- gpg_error_config_version=`$GPG_ERROR_CONFIG $gpg_error_config_args --version`
- major=`echo $gpg_error_config_version | \
- sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
- minor=`echo $gpg_error_config_version | \
- sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
- if test "$major" -gt "$req_major"; then
- ok=yes
- else
- if test "$major" -eq "$req_major"; then
- if test "$minor" -ge "$req_minor"; then
- ok=yes
- fi
- fi
+ if test x"${gpg_error_use_config}" = xyes; then
+ if test x"${GPG_ERROR_CONFIG}" = x ; then
+ if test x"${gpg_error_config_prefix}" != x ; then
+ GPG_ERROR_CONFIG="${gpg_error_config_prefix}/bin/gpg-error-config"
+ else
+ case "${SYSROOT}" in
+ /*)
+ if test -x "${SYSROOT}/bin/gpg-error-config" ; then
+ GPG_ERROR_CONFIG="${SYSROOT}/bin/gpg-error-config"
+ fi
+ ;;
+ '')
+ ;;
+ *)
+ AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+ ;;
+ esac
+ fi
fi
- fi
- if test $ok = yes; then
- GPG_ERROR_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --cflags`
- GPG_ERROR_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --libs`
- GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=mtcflags 2>/dev/null`
- GPG_ERROR_MT_CFLAGS="$GPG_ERROR_CFLAGS${GPG_ERROR_CFLAGS:+ }$GPG_ERROR_MT_CFLAGS"
- GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=mtlibs 2>/dev/null`
- GPG_ERROR_MT_LIBS="$GPG_ERROR_LIBS${GPG_ERROR_LIBS:+ }$GPG_ERROR_MT_LIBS"
- AC_MSG_RESULT([yes ($gpg_error_config_version)])
- ifelse([$2], , :, [$2])
- gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=host 2>/dev/null || echo none`
- if test x"$gpg_error_config_host" != xnone ; then
- if test x"$gpg_error_config_host" != x"$host" ; then
- AC_MSG_WARN([.[.
+
+ AC_PATH_PROG(GPG_ERROR_CONFIG, gpg-error-config, no)
+ AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
+ ok=no
+ if test "$GPG_ERROR_CONFIG" != "no" \
+ && test -f "$GPG_ERROR_CONFIG" ; then
+ req_major=`echo $min_gpg_error_version | \
+ sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
+ req_minor=`echo $min_gpg_error_version | \
+ sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
+ gpg_error_config_version=`$GPG_ERROR_CONFIG $gpg_error_config_args --version`
+ major=`echo $gpg_error_config_version | \
+ sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
+ minor=`echo $gpg_error_config_version | \
+ sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
+ if test "$major" -gt "$req_major"; then
+ ok=yes
+ else
+ if test "$major" -eq "$req_major"; then
+ if test "$minor" -ge "$req_minor"; then
+ ok=yes
+ fi
+ fi
+ fi
+ fi
+ if test $ok = yes; then
+ GPG_ERROR_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --cflags`
+ GPG_ERROR_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --libs`
+ GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=mtcflags 2>/dev/null`
+ GPG_ERROR_MT_CFLAGS="$GPG_ERROR_CFLAGS${GPG_ERROR_CFLAGS:+ }$GPG_ERROR_MT_CFLAGS"
+ GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=mtlibs 2>/dev/null`
+ GPG_ERROR_MT_LIBS="$GPG_ERROR_LIBS${GPG_ERROR_LIBS:+ }$GPG_ERROR_MT_LIBS"
+ AC_MSG_RESULT([yes ($gpg_error_config_version)])
+ ifelse([$2], , :, [$2])
+ gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --variable=host 2>/dev/null || echo none`
+ if test x"$gpg_error_config_host" != xnone ; then
+ if test x"$gpg_error_config_host" != x"$host" ; then
+ AC_MSG_WARN([.[.
***
*** The config script $GPG_ERROR_CONFIG was
*** built for $gpg_error_config_host and thus may not match the
@@ -105,19 +121,20 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
*** You may want to use the configure option --with-libgpg-error-prefix
*** to specify a matching config script or use \$SYSROOT.
***]])
- gpg_config_script_warn="$gpg_config_script_warn libgpg-error"
+ gpg_config_script_warn="$gpg_config_script_warn libgpg-error"
+ fi
fi
+ else
+ GPG_ERROR_CFLAGS=""
+ GPG_ERROR_LIBS=""
+ GPG_ERROR_MT_CFLAGS=""
+ GPG_ERROR_MT_LIBS=""
+ AC_MSG_RESULT(no)
+ ifelse([$3], , :, [$3])
fi
- else
- GPG_ERROR_CFLAGS=""
- GPG_ERROR_LIBS=""
- GPG_ERROR_MT_CFLAGS=""
- GPG_ERROR_MT_LIBS=""
- AC_MSG_RESULT(no)
- ifelse([$3], , :, [$3])
+ AC_SUBST(GPG_ERROR_CFLAGS)
+ AC_SUBST(GPG_ERROR_LIBS)
+ AC_SUBST(GPG_ERROR_MT_CFLAGS)
+ AC_SUBST(GPG_ERROR_MT_LIBS)
fi
- AC_SUBST(GPG_ERROR_CFLAGS)
- AC_SUBST(GPG_ERROR_LIBS)
- AC_SUBST(GPG_ERROR_MT_CFLAGS)
- AC_SUBST(GPG_ERROR_MT_LIBS)
])
diff --git a/m4/pkg.m4 b/m4/pkg.m4
new file mode 100644
index 0000000..ef61d61
--- /dev/null
+++ b/m4/pkg.m4
@@ -0,0 +1,343 @@
+# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
+# serial 11 (pkg-config-0.29.1)
+
+dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
+dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful, but
+dnl WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+dnl General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+dnl 02111-1307, USA.
+dnl
+dnl As a special exception to the GNU General Public License, if you
+dnl distribute this file as part of a program that contains a
+dnl configuration script generated by Autoconf, you may include it under
+dnl the same distribution terms that you use for the rest of that
+dnl program.
+
+dnl PKG_PREREQ(MIN-VERSION)
+dnl -----------------------
+dnl Since: 0.29
+dnl
+dnl Verify that the version of the pkg-config macros are at least
+dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
+dnl installed version of pkg-config, this checks the developer's version
+dnl of pkg.m4 when generating configure.
+dnl
+dnl To ensure that this macro is defined, also add:
+dnl m4_ifndef([PKG_PREREQ],
+dnl [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
+dnl
+dnl See the "Since" comment for each macro you use to see what version
+dnl of the macros you require.
+m4_defun([PKG_PREREQ],
+[m4_define([PKG_MACROS_VERSION], [0.29.1])
+m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
+ [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
+])dnl PKG_PREREQ
+
+dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
+dnl ----------------------------------
+dnl Since: 0.16
+dnl
+dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
+dnl first found in the path. Checks that the version of pkg-config found
+dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
+dnl used since that's the first version where most current features of
+dnl pkg-config existed.
+AC_DEFUN([PKG_PROG_PKG_CONFIG],
+[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
+m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
+m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
+AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
+AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
+AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
+
+if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
+ AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
+fi
+if test -n "$PKG_CONFIG"; then
+ _pkg_min_version=m4_default([$1], [0.9.0])
+ AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
+ if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
+ AC_MSG_RESULT([yes])
+ else
+ AC_MSG_RESULT([no])
+ PKG_CONFIG=""
+ fi
+fi[]dnl
+])dnl PKG_PROG_PKG_CONFIG
+
+dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------------------------------
+dnl Since: 0.18
+dnl
+dnl Check to see whether a particular set of modules exists. Similar to
+dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
+dnl
+dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+dnl only at the first occurence in configure.ac, so if the first place
+dnl it's called might be skipped (such as if it is within an "if", you
+dnl have to call PKG_CHECK_EXISTS manually
+AC_DEFUN([PKG_CHECK_EXISTS],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+if test -n "$PKG_CONFIG" && \
+ AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
+ m4_default([$2], [:])
+m4_ifvaln([$3], [else
+ $3])dnl
+fi])
+
+dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
+dnl ---------------------------------------------
+dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
+dnl pkg_failed based on the result.
+m4_define([_PKG_CONFIG],
+[if test -n "$$1"; then
+ pkg_cv_[]$1="$$1"
+ elif test -n "$PKG_CONFIG"; then
+ PKG_CHECK_EXISTS([$3],
+ [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
+ test "x$?" != "x0" && pkg_failed=yes ],
+ [pkg_failed=yes])
+ else
+ pkg_failed=untried
+fi[]dnl
+])dnl _PKG_CONFIG
+
+dnl _PKG_SHORT_ERRORS_SUPPORTED
+dnl ---------------------------
+dnl Internal check to see if pkg-config supports short errors.
+AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
+if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
+ _pkg_short_errors_supported=yes
+else
+ _pkg_short_errors_supported=no
+fi[]dnl
+])dnl _PKG_SHORT_ERRORS_SUPPORTED
+
+
+dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl [ACTION-IF-NOT-FOUND])
+dnl --------------------------------------------------------------
+dnl Since: 0.4.0
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
+dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
+AC_DEFUN([PKG_CHECK_MODULES],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
+AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
+
+pkg_failed=no
+AC_MSG_CHECKING([for $1])
+
+_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
+_PKG_CONFIG([$1][_LIBS], [libs], [$2])
+
+m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
+and $1[]_LIBS to avoid the need to call pkg-config.
+See the pkg-config man page for more details.])
+
+if test $pkg_failed = yes; then
+ AC_MSG_RESULT([no])
+ _PKG_SHORT_ERRORS_SUPPORTED
+ if test $_pkg_short_errors_supported = yes; then
+ $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
+ else
+ $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
+ fi
+ # Put the nasty error message in config.log where it belongs
+ echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
+
+ m4_default([$4], [.AC_MSG_ERROR(
+[.Package requirements ($2) were not met:
+
+$$1_PKG_ERRORS
+
+Consider adjusting the PKG_CONFIG_PATH environment variable if you
+installed software in a non-standard prefix.
+
+_PKG_TEXT])[]dnl
+ ])
+elif test $pkg_failed = untried; then
+ AC_MSG_RESULT([no])
+ m4_default([$4], [.AC_MSG_FAILURE(
+[.The pkg-config script could not be found or is too old. Make sure it
+is in your PATH or set the PKG_CONFIG environment variable to the full
+path to pkg-config.
+
+_PKG_TEXT
+
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
+ ])
+else
+ $1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
+ $1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+ AC_MSG_RESULT([yes])
+ $3
+fi[]dnl
+])dnl PKG_CHECK_MODULES
+
+
+dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
+dnl [ACTION-IF-NOT-FOUND])
+dnl ---------------------------------------------------------------------
+dnl Since: 0.29
+dnl
+dnl Checks for existence of MODULES and gathers its build flags with
+dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
+dnl and VARIABLE-PREFIX_LIBS from --libs.
+dnl
+dnl Note that if there is a possibility the first call to
+dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
+dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
+dnl configure.ac.
+AC_DEFUN([PKG_CHECK_MODULES_STATIC],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+_save_PKG_CONFIG=$PKG_CONFIG
+PKG_CONFIG="$PKG_CONFIG --static"
+PKG_CHECK_MODULES($@)
+PKG_CONFIG=$_save_PKG_CONFIG[]dnl
+])dnl PKG_CHECK_MODULES_STATIC
+
+
+dnl PKG_INSTALLDIR([DIRECTORY])
+dnl -------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable pkgconfigdir as the location where a module
+dnl should install pkg-config .pc files. By default the directory is
+dnl $libdir/pkgconfig, but the default can be changed by passing
+dnl DIRECTORY. The user can override through the --with-pkgconfigdir
+dnl parameter.
+AC_DEFUN([PKG_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+ [pkg-config installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([pkgconfigdir],
+ [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
+ [with_pkgconfigdir=]pkg_default)
+AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_INSTALLDIR
+
+
+dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
+dnl --------------------------------
+dnl Since: 0.27
+dnl
+dnl Substitutes the variable noarch_pkgconfigdir as the location where a
+dnl module should install arch-independent pkg-config .pc files. By
+dnl default the directory is $datadir/pkgconfig, but the default can be
+dnl changed by passing DIRECTORY. The user can override through the
+dnl --with-noarch-pkgconfigdir parameter.
+AC_DEFUN([PKG_NOARCH_INSTALLDIR],
+[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
+m4_pushdef([pkg_description],
+ [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
+AC_ARG_WITH([noarch-pkgconfigdir],
+ [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
+ [with_noarch_pkgconfigdir=]pkg_default)
+AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
+m4_popdef([pkg_default])
+m4_popdef([pkg_description])
+])dnl PKG_NOARCH_INSTALLDIR
+
+
+dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+dnl -------------------------------------------
+dnl Since: 0.28
+dnl
+dnl Retrieves the value of the pkg-config variable for the given module.
+AC_DEFUN([PKG_CHECK_VAR],
+[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
+
+_PKG_CONFIG([$1], [variable="][$3]["], [$2])
+AS_VAR_COPY([$1], [pkg_cv_][$1])
+
+AS_VAR_IF([$1], [""], [$5], [$4])dnl
+])dnl PKG_CHECK_VAR
+
+dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
+dnl [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
+dnl [DESCRIPTION], [DEFAULT])
+dnl ------------------------------------------
+dnl
+dnl Prepare a "--with-" configure option using the lowercase
+dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
+dnl PKG_CHECK_MODULES in a single macro.
+AC_DEFUN([PKG_WITH_MODULES],
+[
+m4_pushdef([with_arg], m4_tolower([$1]))
+
+m4_pushdef([description],
+ [m4_default([$5], [build with ]with_arg[ support])])
+
+m4_pushdef([def_arg], [m4_default([$6], [auto])])
+m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
+m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])
+
+m4_case(def_arg,
+ [yes],[m4_pushdef([with_without], [--without-]with_arg)],
+ [m4_pushdef([with_without],[--with-]with_arg)])
+
+AC_ARG_WITH(with_arg,
+ AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
+ [AS_TR_SH([with_]with_arg)=def_arg])
+
+AS_CASE([$AS_TR_SH([with_]with_arg)],
+ [yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
+ [auto],[PKG_CHECK_MODULES([$1],[$2],
+ [m4_n([def_action_if_found]) $3],
+ [m4_n([def_action_if_not_found]) $4])])
+
+m4_popdef([with_arg])
+m4_popdef([description])
+m4_popdef([def_arg])
+
+])dnl PKG_WITH_MODULES
+
+dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
+dnl [DESCRIPTION], [DEFAULT])
+dnl -----------------------------------------------
+dnl
+dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
+dnl check._[VARIABLE-PREFIX] is exported as make variable.
+AC_DEFUN([PKG_HAVE_WITH_MODULES],
+[
+PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])
+
+AM_CONDITIONAL([HAVE_][$1],
+ [test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
+])dnl PKG_HAVE_WITH_MODULES
+
+dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
+dnl [DESCRIPTION], [DEFAULT])
+dnl ------------------------------------------------------
+dnl
+dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
+dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
+dnl and preprocessor variable.
+AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
+[
+PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])
+
+AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
+ [AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
+])dnl PKG_HAVE_DEFINE_WITH_MODULES
--
2.18.1


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