--- a/hotspot/src/share/vm/runtime/arguments.cpp	Mon May 21 14:56:33 2012 -0700
+++ b/hotspot/src/share/vm/runtime/arguments.cpp	Thu Jun 07 12:30:02 2012 -0700
@@ -3041,7 +3041,7 @@
     return result;
   }
 
-#ifdef JAVASE_EMBEDDED
+#if (defined JAVASE_EMBEDDED || defined ARM)
   UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
 #endif
 
@@ -3094,6 +3094,14 @@
     PrintGC = true;
   }
 
+  if (!JDK_Version::is_gte_jdk18x_version()) {
+    // To avoid changing the log format for 7 updates this flag is only
+    // true by default in JDK8 and above.
+    if (FLAG_IS_DEFAULT(PrintGCCause)) {
+      FLAG_SET_DEFAULT(PrintGCCause, false);
+    }
+  }
+
   // Set object alignment values.
   set_object_alignment();