gcc/testsuite/gcc.dg/pr39084.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 struct color { int i; };
   5 static const struct color col;
   6 struct color * f(void)
   7 {
   8     return (struct color *) &col;
   9 }
  10
  11 struct color { int j; }; /* { dg-error "redefinition of" } */