用于进行gcc测试

				/* { dg-do compile } */				/* { dg-options "-O2 -Wstrict-aliasing -fstrict-aliasing" } */												class base {				 public:				  int x;				};								class derived: public base {				 public:				  int y;				};								base foo () {				  derived d;				  base* pb = &d;  /* { dg-bogus "base vs. derived" } */				  pb->x = 1;								  return d;				}