diff -r 000000000000 -r 6474c204b198 accessible/src/base/Asserts.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/accessible/src/base/Asserts.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAccessibleRelation.h"
+#include "nsIAccessibleRole.h"
+#include "RelationType.h"
+#include "Role.h"
+
+using namespace mozilla::a11y;
+
+#define ROLE(geckoRole, stringRole, atkRole, macRole, msaaRole, ia2Role, nameRule) \
+  static_assert(static_cast<uint32_t>(roles::geckoRole) \
+                == static_cast<uint32_t>(nsIAccessibleRole::ROLE_ ## geckoRole), \
+                "internal and xpcom roles differ!");
+#include "RoleMap.h"
+#undef ROLE
+
+#define RELATIONTYPE(geckoType, stringType, atkType, msaaType, ia2Type) \
+  static_assert(static_cast<uint32_t>(RelationType::geckoType) \
+                == static_cast<uint32_t>(nsIAccessibleRelation::RELATION_ ## geckoType), \
+                "internal and xpcom relations differ!");
+#include "RelationTypeMap.h"
+#undef RELATIONTYPE