diff -r cfa173720adb -r daa4d069c514 jdk/make/sun/util/Makefile
--- a/jdk/make/sun/util/Makefile	Wed Dec 28 10:51:24 2011 -0800
+++ b/jdk/make/sun/util/Makefile	Thu Dec 29 16:39:51 2011 -0800
@@ -26,6 +26,9 @@
 BUILDDIR = ../..
 PACKAGE = sun.util
 PRODUCT = sun
+JAVAC_MAX_WARNINGS = true
+JAVAC_WARNINGS_FATAL = true
+
 include $(BUILDDIR)/common/Defs.gmk
 
 #