linux下编程用 编译软件

				// { dg-do run  }				// Test that we only call f once and that pointers to different subobjects				// compare as different.								struct A { void f() { } };				struct B: public A { };				struct C: public A { };				struct D : public B, public C { };								typedef void (B::*bp)();				typedef void (C::*cp)();				typedef void (D::*dp)();								dp d1;								int call;								dp f () { ++call; return d1; }								int main()				{				  bp b = &A::f;				  cp c = &A::f;				  d1 = b;				  dp d2 = c;				  return (f() == d2 || call != 1);				}