bool nested_externs:1; /**< Warn if an 'extern' declaration is encountered within a function. */
bool nonnull:1; /**< Warn about passing a null pointer for arguments marked nonnull. */
bool old_style_definition:1; /**< Warn if an old-style function definition is used. */
-#if 0 // TODO
bool packed:1; /**< Warn if a structure is given the packed attribute, but the packed attribute has no effect on the layout or size of the structure */
bool padded:1; /**< Warn if padding is included in a structure, either to align an element of the structure or to align the whole structure */
+#if 0 // TODO
bool parentheses:1; /**< Warn if parentheses are omitted in certain contexts (assignment where truth value is expected, if-else-braces) */
#endif
bool pointer_arith:1; /**< Warn about anything that depends on the "size of" a function type or of 'void' */