gcc/testsuite/gcc.dg/empty2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-pedantic" } */
   3 double d=0;
   4
   5 struct A {} a; /* { dg-warning "struct has no members" } */
   6
   7 void foo(struct A x)
   8 {
   9   d=0;
  10 }
  11
  12 void bar()
  13 {
  14   if (d) foo(a);
  15 }