extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
extern bool attribute_takes_identifier_p (const_tree);
-extern bool c_common_handle_option (size_t, const char *, int, int,
+extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
const struct cl_option_handlers *);
extern tree c_common_type_for_mode (enum machine_mode, int);
extern tree c_common_type_for_size (unsigned int, int);