--- old/src/hotspot/share/runtime/thread.hpp	2018-05-31 15:33:15.515550216 +0200
+++ new/src/hotspot/share/runtime/thread.hpp	2018-05-31 15:33:14.977559440 +0200
@@ -325,7 +325,9 @@
   volatile void* _polling_page;                 // Thread local polling page
 
   ThreadLocalAllocBuffer _tlab;                 // Thread-local eden
+#ifdef INCLUDE_ALL_GCS
   PLAB*                  _gclab;                // Thread-local allocation buffer for GC (e.g. evacuation)
+#endif
   jlong _allocated_bytes;                       // Cumulative number of bytes allocated on
                                                 // the Java heap
   mutable TRACE_DATA _trace_data;               // Thread-local data for tracing
@@ -514,8 +516,10 @@
   }
 
   // Thread-Local GC Allocation Buffer (GCLAB) support
+#ifdef INCLUDE_ALL_GCS
   PLAB* gclab()                                  { return _gclab; }
   void set_gclab(PLAB* gclab)                    { _gclab = gclab; }
+#endif
   jlong allocated_bytes()               { return _allocated_bytes; }
   void set_allocated_bytes(jlong value) { _allocated_bytes = value; }
   void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }