--- old/src/hotspot/share/jvmci/jvmciRuntime.hpp	2018-04-27 15:31:34.722199053 +0200
+++ new/src/hotspot/share/jvmci/jvmciRuntime.hpp	2018-04-27 15:31:34.470199062 +0200
@@ -150,8 +150,10 @@
   // printed as a string, otherwise the type of the object is printed
   // followed by its address.
   static void log_object(JavaThread* thread, oopDesc* object, bool as_string, bool newline);
+#if INCLUDE_G1GC
   static void write_barrier_pre(JavaThread* thread, oopDesc* obj);
   static void write_barrier_post(JavaThread* thread, void* card);
+#endif
   static jboolean validate_object(JavaThread* thread, oopDesc* parent, oopDesc* child);
 
   // used to throw exceptions from compiled JVMCI code