+gfc_resolve_extends_type_of (gfc_expr *f, gfc_expr *a, gfc_expr *mo)
+{
+ gfc_symbol *vtab;
+ gfc_symtree *st;
+
+ /* Prevent double resolution. */
+ if (f->ts.type == BT_LOGICAL)
+ return;
+
+ /* Replace the first argument with the corresponding vtab. */
+ if (a->ts.type == BT_CLASS)
+ gfc_add_component_ref (a, "$vptr");
+ else if (a->ts.type == BT_DERIVED)
+ {
+ vtab = gfc_find_derived_vtab (a->ts.u.derived);
+ /* Clear the old expr. */
+ gfc_free_ref_list (a->ref);
+ memset (a, '\0', sizeof (gfc_expr));
+ /* Construct a new one. */
+ a->expr_type = EXPR_VARIABLE;
+ st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
+ a->symtree = st;
+ a->ts = vtab->ts;
+ }
+
+ /* Replace the second argument with the corresponding vtab. */
+ if (mo->ts.type == BT_CLASS)
+ gfc_add_component_ref (mo, "$vptr");
+ else if (mo->ts.type == BT_DERIVED)
+ {
+ vtab = gfc_find_derived_vtab (mo->ts.u.derived);
+ /* Clear the old expr. */
+ gfc_free_ref_list (mo->ref);
+ memset (mo, '\0', sizeof (gfc_expr));
+ /* Construct a new one. */
+ mo->expr_type = EXPR_VARIABLE;
+ st = gfc_find_symtree (vtab->ns->sym_root, vtab->name);
+ mo->symtree = st;
+ mo->ts = vtab->ts;
+ }
+
+ f->ts.type = BT_LOGICAL;
+ f->ts.kind = 4;
+
+ f->value.function.isym->formal->ts = a->ts;
+ f->value.function.isym->formal->next->ts = mo->ts;
+
+ /* Call library function. */
+ f->value.function.name = gfc_get_string (PREFIX ("is_extension_of"));
+}
+
+
+void
+gfc_resolve_fdate (gfc_expr *f)