- (dtucker) [configure.ac] Run stack-protector tests with -Werror to catch

   platforms where gcc understands the option but it's not supported (and
   thus generates a warning).

1 files changed, 15 insertions, 8 deletions

diff --git a/configure.ac b/configure.ac
index b71f6832a..b6fa19bd0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.394 2008/03/09 00:34:23 dtucker Exp $
+# $Id: configure.ac,v 1.395 2008/03/09 11:50:50 dtucker Exp $
 #
 # Copyright (c) 1999-2004 Damien Miller
 #
@@ -15,7 +15,7 @@
 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 AC_INIT(OpenSSH, Portable, openssh-unix-dev@mindrot.org)
-AC_REVISION($Revision: 1.394 $)
+AC_REVISION($Revision: 1.395 $)
 AC_CONFIG_SRCDIR([ssh.c])
 
 AC_CONFIG_HEADER(config.h)
@@ -113,16 +113,23 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
         esac
 
         # -fstack-protector-all doesn't always work for some GCC versions
-        # and/or platforms, so we test if we can.
+        # and/or platforms, so we test if we can.  If it's not supported
+        # on a give platform gcc will emit a warning so we use -Werror.
         if test "x$use_stack_protector" = "x1"; then
             for t in -fstack-protector-all -fstack-protector; do
-                AC_MSG_CHECKING(if $CC understands $t)
+                AC_MSG_CHECKING(if $CC supports $t)
                 saved_CFLAGS="$CFLAGS"
                 saved_LDFLAGS="$LDFLAGS"
-                CFLAGS="$CFLAGS $t"
-                LDFLAGS="$LDFLAGS $t"
-                AC_TRY_LINK([], [ int main(void){return 0;} ],
+                CFLAGS="$CFLAGS $t -Werror"
+                LDFLAGS="$LDFLAGS $t -Werror"
+                AC_LINK_IFELSE(
+                        [AC_LANG_SOURCE([
+#include <stdlib.h>
+int main(void){return 0;}
+                         ])],
                     [ AC_MSG_RESULT(yes)
+                      CFLAGS="$saved_CFLAGS $t"
+                      LDFLAGS="$saved_LDFLAGS $t"
                       AC_MSG_CHECKING(if $t works)
                       AC_RUN_IFELSE(
                         [AC_LANG_SOURCE([
@@ -134,7 +141,7 @@ int main(void){exit(0);}
                         [ AC_MSG_RESULT(no) ],
                         [ AC_MSG_WARN([cross compiling: cannot test])
                           break ]
-                    )
+                      )
                     ],
                     [ AC_MSG_RESULT(no) ]
                 )