--- old/makefiles/CompileJavaClasses.gmk	2013-08-13 15:04:26.000000000 -0700
+++ new/makefiles/CompileJavaClasses.gmk	2013-08-13 15:04:26.000000000 -0700
@@ -291,6 +291,7 @@
 
 $(eval $(call SetupJavaCompilation,BUILD_JDK,\
                 SETUP:=GENERATE_JDKBYTECODE,\
+		FLAGS:=-Xlint:-unchecked(COMMA)-deprecation(COMMA)auxiliaryclass(COMMA)classfile(COMMA)divzero(COMMA)empty(COMMA)fallthrough(COMMA)finally(COMMA)try(COMMA)varargs -Werror,\
 		SRC:=$(JDK_TOPDIR)/src/share/classes \
 		     $(JDK_TOPDIR)/src/$(OPENJDK_TARGET_OS_API_DIR)/classes \
 		     $(MACOSX_SRC_DIRS) \