Bug 711895 - Tweak the warning options used for GCC builds. r=waldo, derf.

js/src/jsarray.cpp

@@ -404,11 +404,24 @@ DoGetElement(JSContext *cx, JSObject *obj, uint32_t index, JSBool *hole, Value *
     return true;
 }
 
+template<typename IndexType>
+static void
+AssertGreaterThanZero(IndexType index)
+{
+    JS_ASSERT(index >= 0);
+}
+
+template<>
+void
+AssertGreaterThanZero(jsuint index)
+{
+}
+
 template<typename IndexType>
 static JSBool
 GetElement(JSContext *cx, JSObject *obj, IndexType index, JSBool *hole, Value *vp)
 {
-    JS_ASSERT(index >= 0);
+    AssertGreaterThanZero(index);
     if (obj->isDenseArray() && index < obj->getDenseArrayInitializedLength() &&
         !(*vp = obj->getDenseArrayElement(uint32_t(index))).isMagic(JS_ARRAY_HOLE)) {
         *hole = JS_FALSE;