gcc/testsuite/gcc.dg/pr23075.c

/* PR c/23075 */
/* { dg-do compile } */
/* { dg-options "-O2 -Wreturn-type" } */

int
foo (void)
{
  return;	/* { dg-warning "with no value" } */
}		/* { dg-bogus "control reaches end" } */

int
bar (void)
{
}		/* { dg-warning "control reaches end" } */