-word GC_max_height;
-ptr_t GC_deepest_obj;
-
-/* Compute the maximum height of every unreachable predecessor p of a */
-/* reachable object. Arrange to save the heights of all such objects p */
-/* so that they can be used in calculating the height of objects in the */
-/* next GC. */
-/* Set GC_max_height to be the maximum height we encounter, and */
-/* GC_deepest_obj to be the corresponding object. */
-static void update_max_height(ptr_t p, word n_words, word gc_descr)
+STATIC word GC_max_height = 0;
+STATIC ptr_t GC_deepest_obj = NULL;
+
+/* Compute the maximum height of every unreachable predecessor p of a */
+/* reachable object. Arrange to save the heights of all such objects p */
+/* so that they can be used in calculating the height of objects in the */
+/* next GC. */
+/* Set GC_max_height to be the maximum height we encounter, and */
+/* GC_deepest_obj to be the corresponding object. */
+/*ARGSUSED*/
+static void update_max_height(ptr_t p, size_t n_bytes, word gc_descr)