1  
       2  typedef __builtin_va_list __gnuc_va_list;
       3  typedef __gnuc_va_list va_list;
       4  
       5  struct X { int y; };
       6  
       7  void func(va_list va)
       8  {
       9    char* a = __builtin_va_arg(va, char**)[0];
      10    int b = __builtin_va_arg(va, struct X*)->y;
      11  }