gcc/testsuite/gcc.dg/builtin-clear-padding-2.c

/* PR middle-end/97943 */
/* { dg-do compile } */
/* { dg-options "" } */

struct S { int a; char b[] __attribute__((aligned (2 * sizeof (int)))); };
struct T { int a; struct S b; int c; };
union U { int a; struct S b; };
struct V { int a; union U b; int : 15; int c; };

void
foo (struct T *t, struct V *v)
{
  __builtin_clear_padding (t);	/* { dg-error "flexible array member 'b' does not have well defined padding bits for '__builtin_clear_padding'" } */
  __builtin_clear_padding (v);	/* { dg-error "flexible array member 'b' does not have well defined padding bits for '__builtin_clear_padding'" } */
}