From 9145fc8e0a43baae684f00a56714e228fc31f63d Mon Sep 17 00:00:00 2001
From: Aki Tuomi <cmouse@desteem.org>
Date: Mon, 1 Sep 2014 13:13:06 +0300
Subject: [PATCH] Fix definition and test whether D_FORTIFY_SOURCE gives
 warning

---
 m4/pdns_d_fortify_source.m4 | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/m4/pdns_d_fortify_source.m4 b/m4/pdns_d_fortify_source.m4
index 721c9cce09..7f90329a99 100644
--- a/m4/pdns_d_fortify_source.m4
+++ b/m4/pdns_d_fortify_source.m4
@@ -1,5 +1,5 @@
 dnl
-dnl Check for support for position independent executables
+dnl Check for support D_FORTIFY_SOURCE
 dnl
 dnl Copyright (C) 2013 Red Hat, Inc.
 dnl
@@ -19,8 +19,10 @@ dnl <http://www.gnu.org/licenses/>.
 dnl
 
 AC_DEFUN([AC_CC_D_FORTIFY_SOURCE],[
+      OLD_CXXFLAGS="$CXXFLAGS"
+      CXXFLAGS="-Wall -W -Werror $CXXFLAGS"
       gl_COMPILER_OPTION_IF([-D_FORTIFY_SOURCE=2], [
         CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
-        CXXFLAGS="$CXXFLAGS -D_FORTIFY_SOURCE=2"
-      ])
+        CXXFLAGS="$OLD_CXXFLAGS -D_FORTIFY_SOURCE=2"
+      ], [CXXFLAGS="$OLD_CXXFLAGS"], [AC_LANG_PROGRAM([[#include <stdio.h>]],[])])
 ]) 
-- 
2.47.2