configure: add configure check for GCC -Wold-style-definition

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>

configure.ac

@@ -144,6 +144,7 @@ fi
 
 # END testsuites knobs
 LTP_CHECK_FORTIFY_SOURCE
+LTP_CHECK_CC_WARN_OLDSTYLE
 LTP_CHECK_MKDTEMP
 LTP_CHECK_CAPABILITY_SUPPORT
 LTP_CHECK_CRYPTO

include/mk/config.mk.in

@@ -66,7 +66,7 @@ DEBUG_CXXFLAGS		?= $(DEBUG_CFLAGS)
 OPT_CFLAGS		?= -O2 -fno-strict-aliasing -pipe
 OPT_CXXFLAGS		?= $(OPT_CFLAGS)
 
-WCFLAGS			?= -Wall -W -Wold-style-definition
+WCFLAGS			?= -Wall -W @GCC_WARN_OLDSTYLE@
 WCXXFLAGS		?= $(WCFLAGS)
 
 LDFLAGS			+= $(WLDFLAGS)

m4/ltp-warn_oldstyle.m4

@@ -0,0 +1,37 @@
+dnl Copyright (c) 2014 Oracle and/or its affiliates. All Rights Reserved.
+dnl
+dnl This program is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU General Public License as
+dnl published by the Free Software Foundation; either version 2 of
+dnl the License, or (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it would be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU 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 the Free Software Foundation,
+dnl Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+dnl
+dnl Author: Alexey Kodanev <alexey.kodanev@oracle.com>
+dnl
+
+AC_DEFUN([LTP_CHECK_CC_WARN_OLDSTYLE],[dnl
+
+AC_MSG_CHECKING([if $CC supports -Wold-style-definition])
+
+backup_cflags="$CFLAGS"
+CFLAGS="-Wold-style-definition"
+
+AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM([])],
+	[GCC_WARN_OLDSTYLE="$CFLAGS"]
+	[AC_MSG_RESULT([yes])],
+	[AC_MSG_RESULT([no])]
+)
+
+AC_SUBST(GCC_WARN_OLDSTYLE)
+CFLAGS="$backup_cflags"
+
+])