gcc/testsuite/gcc.dg/union-cast-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-std=gnu89" } */
   3 /* A combine of two extensions to C89 are used here.
   4    First casts to unions is used.
   5    Second subscripting non lvalue arrays, this is in C99. */
   6
   7 union vx {short f[8]; int v;};
   8 int vec;
   9
  10 void
  11 foo5 (int vec)
  12 {
  13   ((union vx) vec).f[5] = 1;
  14 }