--- old/src/hotspot/share/gc/shared/genOopClosures.hpp	2018-04-27 15:29:54.474202545 +0200
+++ new/src/hotspot/share/gc/shared/genOopClosures.hpp	2018-04-27 15:29:54.230202554 +0200
@@ -94,6 +94,7 @@
   void do_cld_barrier();
 };
 
+#if INCLUDE_SERIALGC
 
 // Closure for scanning DefNewGeneration.
 //
@@ -132,6 +133,8 @@
   inline void do_oop_nv(narrowOop* p);
 };
 
+#endif // INCLUDE_SERIALGC
+
 class CLDScanClosure: public CLDClosure {
   OopsInClassLoaderDataOrGenClosure*   _scavenge_closure;
   // true if the the modified oops state should be saved.
@@ -161,6 +164,8 @@
   inline bool do_metadata_nv()        { assert(!_cl->do_metadata(), "assumption broken, must change to 'return _cl->do_metadata()'"); return false; }
 };
 
+#if INCLUDE_SERIALGC
+
 // Closure for scanning DefNewGeneration's weak references.
 // NOTE: very much like ScanClosure but not derived from
 //  OopsInGenClosure -- weak references are processed all
@@ -178,4 +183,6 @@
   inline void do_oop_nv(narrowOop* p);
 };
 
+#endif // INCLUDE_SERIALGC
+
 #endif // SHARE_VM_GC_SHARED_GENOOPCLOSURES_HPP