gcc/testsuite/c-c++-common/Wunused-var-4.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wunused -W" } */
   3
   4 int
   5 f1 (unsigned int x)
   6 {
   7   int c = ({ union { unsigned int a; int b; } u; u.a = x; u.b; });
   8   return c;
   9 }
  10
  11 void
  12 f2 (void)
  13 {
  14   struct S { int i; } a;
  15   int b[1];
  16   a.i = 1;
  17   a.i;                          /* { dg-warning "no effect" } */
  18   b[0] = 1;
  19   b[0];                         /* { dg-warning "no effect" } */
  20 }
  21
  22 void
  23 f3 (void)
  24 {
  25   struct S { int i; } a;        /* { dg-warning "set but not used" } */
  26   int b[1];                     /* { dg-warning "set but not used" } */
  27   a.i = 1;
  28   b[0] = 1;
  29 }