1 struct B; 2 struct A 3 { 4 long a; 5 struct B *foo; 6 struct C *bar; 7 }; 8 9 struct C 10 { 11 struct B *foo; 12 int b; 13 }; 14 15 static struct C *foo __attribute__((used)); 16 static struct A *bar __attribute__((used)); 17