--- old/src/share/vm/runtime/arguments.cpp	2015-06-12 14:49:27.025961664 +0200
+++ new/src/share/vm/runtime/arguments.cpp	2015-06-12 14:49:26.869956586 +0200
@@ -46,6 +46,7 @@
 #include "services/memTracker.hpp"
 #include "utilities/defaultStream.hpp"
 #include "utilities/macros.hpp"
+#include "utilities/semaphore.hpp"
 #include "utilities/stringUtils.hpp"
 #if INCLUDE_ALL_GCS
 #include "gc/cms/compactibleFreeListSpace.hpp"
@@ -3864,6 +3865,14 @@
   no_shared_spaces("CDS Disabled");
 #endif // INCLUDE_CDS
 
+  // The Semaphore class isn't implemented on all platforms.
+#if !IMPLEMENTS_SEMAPHORE_CLASS
+  if (UseSemaphoreGCThreadsSynchronization && FLAG_IS_CMDLINE(UseSemaphoreGCThreadsSynchronization)) {
+    warning("Semaphore GC Thread Synchronization is not implemented for this platform");
+    FLAG_SET_DEFAULT(UseSemaphoreGCThreadsSynchronization, false);
+  }
+#endif
+
   return JNI_OK;
 }