Make multi-threading flags available via gpg-error-config.

* m4/threadlib.m4: Set THREADLIB_CPPFLAGS.
* src/gpg-error-config.in: Add option --mt.
* configure.ac: Add support for the --mt option.
* src/gpg-error.m4: Add ac_subst GPG_ERROR_MT_CFLAGS and
GPG_ERROR_MT_LIBS.
--

Although, libgpg-error does not yet provide an API for multi-thread
support, it is useful to add the already available detection to the
config script.  This allows the latest Libgcrypt to take advantage of
this in its regression tests.  In particular for the regression tests
a gpgrt_thread functions would be useful and eventually added to
libgpg-error.  The new gpg-error.m4 script should already be used by
other packages to be prepared for future updates.

2 files changed, 25 insertions, 2 deletions

diff --git a/src/gpg-error-config.in b/src/gpg-error-config.in
index b132314..bc1c583 100644
--- a/src/gpg-error-config.in
+++ b/src/gpg-error-config.in
@@ -17,12 +17,14 @@ libdir=@libdir@
 isubdirafter="@GPG_ERROR_CONFIG_ISUBDIRAFTER@"
 
 output=""
+mt=no
 
 usage()
 {
     cat <<EOF
 Usage: gpg-error-config [OPTIONS]
 Options:
+        [--mt]       (must be the first option)
 	[--prefix]
 	[--exec-prefix]
 	[--version]
@@ -47,6 +49,9 @@ while test $# -gt 0; do
     esac
 
     case $1 in
+        --mt)
+            mt=yes
+            ;;
         --prefix)
 	    output="$output $prefix"
 	    ;;
@@ -67,6 +72,9 @@ while test $# -gt 0; do
                 output="$output -idirafter ${includedir}/${i}"
             done
 	    output="$output @GPG_ERROR_CONFIG_CFLAGS@"
+            if test $mt = yes ; then
+                output="$output @GPG_ERROR_CONFIG_MT_CFLAGS@"
+            fi
 	    ;;
 	--libs)
 	    case "$libdir" in
@@ -76,6 +84,9 @@ while test $# -gt 0; do
 		    ;;
 	    esac
 	    output="$output @GPG_ERROR_CONFIG_LIBS@"
+            if test $mt = yes ; then
+                output="$output @GPG_ERROR_CONFIG_MT_LIBS@"
+            fi
 	    ;;
         --host)
             echo "@GPG_ERROR_CONFIG_HOST@"
diff --git a/src/gpg-error.m4 b/src/gpg-error.m4
index feb963c..053eceb 100644
--- a/src/gpg-error.m4
+++ b/src/gpg-error.m4
@@ -1,5 +1,5 @@
 # gpg-error.m4 - autoconf macro to detect libgpg-error.
-# Copyright (C) 2002, 2003, 2004, 2011 g10 Code GmbH
+# Copyright (C) 2002, 2003, 2004, 2011, 2014 g10 Code GmbH
 #
 # This file is free software; as a special exception the author gives
 # unlimited permission to copy and/or distribute it, with or without
@@ -8,10 +8,16 @@
 # This file is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Last-changed: 2014-01-24
+
 
 dnl AM_PATH_GPG_ERROR([MINIMUM-VERSION,
 dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
-dnl Test for libgpg-error and define GPG_ERROR_CFLAGS and GPG_ERROR_LIBS
+dnl
+dnl Test for libgpg-error and define GPG_ERROR_CFLAGS, GPG_ERROR_LIBS,
+dnl GPG_ERROR_MT_CFLAGS, and GPG_ERROR_MT_LIBS.  The _MT_ variants are
+dnl used for programs requireding real multi thread support.
 dnl
 AC_DEFUN([AM_PATH_GPG_ERROR],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
@@ -64,6 +70,8 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   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 $gpg_error_config_args --mt --cflags 2>/dev/null`
+    GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --mt --libs 2>/dev/null`
     AC_MSG_RESULT([yes ($gpg_error_config_version)])
     ifelse([$2], , :, [$2])
     gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --host 2>/dev/null || echo none`
@@ -82,9 +90,13 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   else
     GPG_ERROR_CFLAGS=""
     GPG_ERROR_LIBS=""
+    GPG_ERROR_MT_CFLAGS=""
+    GPG_ERROR_MT_LIBS=""
     AC_MSG_RESULT(no)
     ifelse([$3], , :, [$3])
   fi
   AC_SUBST(GPG_ERROR_CFLAGS)
   AC_SUBST(GPG_ERROR_LIBS)
+  AC_SUBST(GPG_ERROR_MT_CFLAGS)
+  AC_SUBST(GPG_ERROR_MT_LIBS)
 ])