struct-ret-2.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Simplified by Alexandre Oliva <[e-mail]>
   from bug report by Helmut Jarausch <[e-mail]>

   Copyright (C) 1999 Free Software Foundation  */

/* { dg-do compile } */
/* { dg-options "-O3 -w" } */

struct {
  unsigned i[4];
} foo() {}
 
void bar() {
  foo();           
}