--- old/src/hotspot/share/gc/shared/gcArguments.cpp	2017-11-29 12:36:33.652819076 +0100
+++ new/src/hotspot/share/gc/shared/gcArguments.cpp	2017-11-29 12:36:33.404809222 +0100
@@ -85,8 +85,10 @@
 #endif // INCLUDE_ALL_GCS
 }
 
-void GCArguments::parse_verification_type(const char* type) {
+bool GCArguments::parse_verification_type(const char* type) {
   log_warning(gc, verify)("VerifyGCType is not supported by this collector.");
+  // Return false to avoid multiple warnings.
+  return false;
 }
 
 void GCArguments::initialize_flags() {
@@ -112,7 +114,10 @@
     strncpy(type_list, VerifyGCType, length + 1);
     char* token = strtok(type_list, delimiter);
     while (token != NULL) {
-      parse_verification_type(token);
+      bool success = parse_verification_type(token);
+      if (!success) {
+        break;
+      }
       token = strtok(NULL, delimiter);
     }
     FREE_C_HEAP_ARRAY(char, type_list);