1 struct S { 2 struct { } empty[1]; 3 int i; 4 }; 5 foo(int i,...)6 int foo(int i, ...) 7 { 8 struct S s; 9 __builtin_va_list va; 10 __builtin_va_start(va, i); 11 s = __builtin_va_arg(va, struct S); 12 __builtin_va_end(va); 13 return s.i; 14 } 15