Allow GCC to recognize -fformat-extensions flag.

contrib/gcc/c-opts.c

@@ -19,6 +19,8 @@ along with GCC; see the file COPYING.  If not, write to the Free
 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 02111-1307, USA.  */
 
+/* $FreeBSD$ */
+
 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
@@ -1043,6 +1045,9 @@ c_common_handle_option (size_t scode, const char *arg, int value)
     case OPT_v:
       verbose = true;
       break;
+
+    case OPT_fformat_extensions:
+      break;
     }
 
   return result;

contrib/gcc/c.opt

@@ -59,6 +59,8 @@
 
 ; Please try to keep this file in ASCII collating order.
 
+; $FreeBSD$
+
 Language
 C
 
@@ -822,4 +824,8 @@ w
 C ObjC C++ ObjC++
 ; Documented in common.opt
 
+fformat-extensions
+C ObjC C++ ObjC++
+Enable FreeBSD format extensions
+
 ; This comment is to ensure we retain the blank line above.