linux下编程用 编译软件

				// { dg-do assemble  }				// prms-id: 807								extern "C" int printf(const char*, ...);								class B;								class AX				{				 protected:				   int x;								 public:				   operator B();				};												class B				{				 private:				   int x;				 public:				   B(const AX&);				};												int foo(B& b);			// { dg-error "" } referenced below												int main()				{				   AX a;				   foo(a);  // { dg-error "" } Ambiguous B(a) or a.operator B()  //  See ARM 12.3.2								}