--- old/src/share/vm/logging/logTag.hpp	2015-11-25 11:38:02.521047516 +0100
+++ new/src/share/vm/logging/logTag.hpp	2015-11-25 11:38:02.421047520 +0100
@@ -32,6 +32,7 @@
 // not be used in log calls, and should not be listed below.)
 #define LOG_TAG_LIST \
   LOG_TAG(defaultmethods) \
+  LOG_TAG(gc) \
   LOG_TAG(logging) \
   LOG_TAG(safepoint) \
   LOG_TAG(vmoperation)