--- a/common/autoconf/toolchain.m4	Thu Feb 13 00:00:20 2014 +0100
+++ b/common/autoconf/toolchain.m4	Wed Feb 12 17:03:39 2014 -0800
@@ -898,7 +898,8 @@
   #
   case $COMPILER_NAME in
     gcc )
-      CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -W -Wall -Wno-unused -Wno-parentheses \
+      # these options are used for both C and C++ compiles
+      CCXXFLAGS_JDK="$CCXXFLAGS $CCXXFLAGS_JDK -Wall -Wno-parentheses -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2 \
       -pipe \
       -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE"
       case $OPENJDK_TARGET_CPU_ARCH in