--- old/src/hotspot/share/oops/oop.hpp	2019-09-07 21:51:33.000000000 +0200
+++ new/src/hotspot/share/oops/oop.hpp	2019-09-07 21:51:33.000000000 +0200
@@ -40,8 +40,6 @@
 //
 // no virtual functions allowed
 
-extern bool always_do_update_barrier;
-
 // Forward declarations.
 class OopClosure;
 class ScanClosure;