gcc/testsuite/gcc.dg/c90-scope-1.c

   1 /* Test for new block scopes in C99.  Inspired by C99 Rationale (N897).  */
   2 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   3 /* { dg-do run } */
   4 /* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
   5
   6 struct foo {
   7   char a;
   8 };
   9
  10 extern void abort (void);
  11 extern void exit (int);
  12
  13 int
  14 sfoo (void)
  15 {
  16   if (sizeof (struct foo { int a; double b; char *c; void *d; }))
  17     (void) 0;
  18   return sizeof (struct foo);
  19 }
  20
  21 int
  22 main (void)
  23 {
  24   int t, u;
  25   t = sfoo ();
  26   u = sizeof (struct foo);
  27   /* With C90 scoping rules the new declaration of struct foo is in scope
  28      above; with C99 it is local to the if.
  29   */
  30   if (t == u)
  31     abort (); /* C99 rules apply.  */
  32   else
  33     exit (0); /* C90 rules apply.  */
  34 }