1*4b169a6bSchristos struct A; 2*4b169a6bSchristos struct B { struct A *a; }; 3*4b169a6bSchristos struct A { struct B b; int foo; struct B b2; }; 4*4b169a6bSchristos 5*4b169a6bSchristos static struct A a __attribute__((__used__)); 6