gcc/testsuite/gcc.dg/c23-fordecl-4.c

   1 /* Test for C99 declarations in for loops.  Test constraints are diagnosed with
   2    -Wc11-c23-compat for C23: struct and union tags can't be declared there
   3    (affirmed in response to DR#277).  Based on c99-fordecl-3.c.  */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=c23 -pedantic-errors -Wc11-c23-compat" } */
   6
   7 void
   8 foo (void)
   9 {
  10   for (struct s { int p; } *p = 0; ;) /* { dg-warning "'struct s' declared in 'for' loop initial declaration" } */
  11     ;
  12   for (union u { int p; } *p = 0; ;) /* { dg-warning "'union u' declared in 'for' loop initial declaration" } */
  13     ;
  14 }