make/linux/makefiles/vm.make

@  rev 8730 : 8210352: [hotspot] --with-extra-cxx-flags should not lower optimization
|  Summary: Strip optimization flags from EXTRA_CFLAGS for the JVM.
~  Reviewed-by: duke

@@ -119,11 +119,17 @@
 
 # Do not use C++ exception handling
 CFLAGS += $(CFLAGS/NOEX)
 
 # Extra flags from gnumake's invocation or environment
-CFLAGS += $(EXTRA_CFLAGS)
+#
+# Disallow lowering of hotspot optimization via
+# EXTRA_CFLAGS. This is controlled via
+# OPT_EXTRAS make variable if so desired. See
+# JDK-8210352 for more info.
+CFLAGS += $(subst -O0,, $(subst -O2,, \
+            $(subst -O1,, $(EXTRA_CFLAGS))))
 LFLAGS += $(EXTRA_CFLAGS) $(EXTRA_LDFLAGS)
 
 # Don't set excutable bit on stack segment
 # the same could be done by separate execstack command
 LFLAGS += -Xlinker -z -Xlinker noexecstack