gcc/testsuite/gcc.dg/union-duplicate-field.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-std=c99" } */
   3
   4 int a0;
   5
   6 struct S
   7 {
   8     int a1;
   9     union {
  10         int a0;
  11         int a1; /* { dg-error "duplicate member" } */
  12         int a2, a3, a4, a5, a6, a7, a8, a9;
  13         int a10, a11, a12, a13, a14, a15;
  14     };
  15 };
  16
  17 int f()
  18 {
  19     struct S s;
  20     return s.a0;
  21 }