/* $NetBSD: msg_329.c,v 1.5 2023/07/07 19:45:22 rillig Exp $ */
# 3 "msg_329.c"
// Test for message: type '%s' is not a member of '%s' [329]
/* lint1-extra-flags: -X 351 */
union u {
int i1;
int i2;
void *vp;
};
void
example(void)
{
/*
* A type cast to a union type is valid if the source type is any
* member type of the union. Since all union members with the same
* type have the same representation, the name of the union member
* doesn't matter.
*
* XXX: could there be padding bits or other tricky details that are
* settable per-member? These could make the type alone insufficient
* for determining the exact representation.
*
* C99 6.5.4 "Cast operators" does not mention a union cast. On the
* contrary, it says that the type name shall specify a scalar type.
*
* C11 6.5.4 "Cast operators" differs from C99 but still requires
* scalar types for both the target type and the source value.
*
* This is a GCC extension.
* See
https://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html.
*/
union u u_i1 = (union u)3;
union u u_vp = (union u)(void *)0;
/* expect+1: error: type 'pointer to char' is not a member of 'union u' [329] */
union u u_cp = (union u)(char *)0;
}
