From 2fbe92fd93253e95ddd5b768d87980fc3853bb56 Mon Sep 17 00:00:00 2001
From: Francesco Salvestrini <salvestrini@gmail.com>
Date: Wed, 17 Sep 2008 19:57:23 +0200
Subject: [PATCH] Added AX_CXXCPP_CHECK_FLAG macro (from autoconf-archive)

---
 tools/autotools/m4/Makefile.am             |  7 ++-
 tools/autotools/m4/ax_cxxcpp_check_flag.m4 | 92 ++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+), 3 deletions(-)
 create mode 100644 tools/autotools/m4/ax_cxxcpp_check_flag.m4

diff --git a/tools/autotools/m4/Makefile.am b/tools/autotools/m4/Makefile.am
index f2fda51..26c21cd 100644
--- a/tools/autotools/m4/Makefile.am
+++ b/tools/autotools/m4/Makefile.am
@@ -30,9 +30,10 @@ include $(top_srcdir)/Makefile.maint
 
 HOST_AUTOCONF_ARCHIVE="http://autoconf-archive.cryp.to"
 
-EXTERNAL =						\
-        $(HOST_AUTOCONF_ARCHIVE)/ax_missing_prog.m4	\
-        $(HOST_AUTOCONF_ARCHIVE)/ax_path_missing.m4
+EXTERNAL =							\
+        $(HOST_AUTOCONF_ARCHIVE)/ax_missing_prog.m4		\
+        $(HOST_AUTOCONF_ARCHIVE)/ax_path_missing.m4		\
+        $(HOST_AUTOCONF_ARCHIVE)/ax_cxxcpp_check_flag.m4
 
 INTERNAL =
 
diff --git a/tools/autotools/m4/ax_cxxcpp_check_flag.m4 b/tools/autotools/m4/ax_cxxcpp_check_flag.m4
new file mode 100644
index 0000000..66a6bb5
--- /dev/null
+++ b/tools/autotools/m4/ax_cxxcpp_check_flag.m4
@@ -0,0 +1,92 @@
+#####
+#
+# SYNOPSIS
+#
+#   AX_CXXCPP_CHECK_FLAG(FLAG-TO-CHECK,[PROLOGUE],[BODY],[ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
+#
+# DESCRIPTION
+#
+#   This macro tests if the C preprocessor supports the flag FLAG-TO-CHECK
+#   If successfull execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE
+#
+#   PROLOGUE and BODY are optional and should be used as in AC_LANG_PROGRAM
+#   macro
+#
+# LAST MODIFICATION
+#
+#   2007-11-26
+#
+# COPYLEFT
+#
+#  Copyright (c) 2007 Francesco Salvestrini <salvestrini@users.sourceforge.net>
+#
+#   This code is inspired from KDE_CHECK_COMPILER_FLAG macro
+#
+#   Thanks to Bogdan Drozdowski <bogdandr@op.pl> for testing and bug fixes 
+#
+#   This program is free software; you can redistribute it and/or
+#   modify it under the terms of the GNU General Public License as
+#   published by the Free Software Foundation; either version 2 of the
+#   License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#   General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the Free Software
+#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+#   02111-1307, USA.
+#
+#   As a special exception, the respective Autoconf Macro's copyright
+#   owner gives unlimited permission to copy, distribute and modify the
+#   configure scripts that are the output of Autoconf when processing
+#   the Macro. You need not follow the terms of the GNU General Public
+#   License when using or distributing such scripts, even though
+#   portions of the text of the Macro appear in them. The GNU General
+#   Public License (GPL) does govern all other use of the material that
+#   constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the
+#   Autoconf Macro released by the Autoconf Macro Archive. When you
+#   make and distribute a modified version of the Autoconf Macro, you
+#   may extend this special exception to the GPL to apply to your
+#   modified version as well.
+
+AC_DEFUN([AX_CXXCPP_CHECK_FLAG],[
+  AC_PREREQ([2.61])
+  AC_REQUIRE([AC_PROG_CXXCPP])
+  AC_REQUIRE([AC_PROG_SED])
+
+  flag=`echo "$1" | $SED 'y% .=/+-(){}<>:*,%_______________%'`
+
+  AC_CACHE_CHECK([whether the C++ preprocessor accepts the $1 flag],
+    [ax_cv_cxxcpp_check_flag_$flag],[
+
+    AC_LANG_PUSH([C++])
+
+    save_CXXFLAGS="$CXXFLAGS"
+    CXXFLAGS="$CXXFLAGS $1"
+    AC_PREPROC_IFELSE([
+      AC_LANG_PROGRAM([$2],[$3])
+    ],[
+      eval "ax_cv_cxxcpp_check_flag_$flag=yes"
+    ],[
+      eval "ax_cv_cxxcpp_check_flag_$flag=no"
+    ])
+
+    CXXFLAGS="$save_CXXFLAGS"
+
+    AC_LANG_POP
+
+  ])
+
+  AS_IF([eval "test \"`echo '$ax_cv_cxxcpp_check_flag_'$flag`\" = yes"],[
+    :
+    $4
+  ],[
+    :
+    $5
+  ])
+])
-- 
2.11.4.GIT