--- old/src/share/vm/runtime/commandLineFlagConstraintList.cpp	2015-08-24 10:52:50.712876506 -0700
+++ new/src/share/vm/runtime/commandLineFlagConstraintList.cpp	2015-08-24 10:52:50.608876510 -0700
@@ -274,7 +274,7 @@
                                    EMIT_CONSTRAINT_CHECK));
 #endif // COMPILER2
 
-#ifndef INCLUDE_ALL_GCS
+#if INCLUDE_ALL_GCS
   emit_constraint_no(NULL G1_FLAGS(EMIT_CONSTRAINT_DEVELOPER_FLAG,
                                    EMIT_CONSTRAINT_PD_DEVELOPER_FLAG,
                                    EMIT_CONSTRAINT_PRODUCT_FLAG,
@@ -305,10 +305,7 @@
 
 // Check constraints for specific constraint type.
 bool CommandLineFlagConstraintList::check_constraints(CommandLineFlagConstraint::ConstraintType type) {
-  // Skip if we already checked.
-  if (type < _validating_type) {
-    return true;
-  }
+  guarantee(type > _validating_type, "Constraint check is out of order.");
   _validating_type = type;
 
   bool status = true;