linux下编程用 编译软件

				// { dg-do run  }				// prms-id: 3708								extern "C" int printf (const char *, ...);				extern "C" int atoi (const char *);								void *ptr;								class A {				public:				  A() { printf ("A is constructed.\n"); }				  virtual void xx(int doit) { printf ("A is destructed.\n"); }				};								class A1 {				public:				  A1() { printf ("A1 is constructed.\n"); }				  virtual void xx(int doit) { printf ("A1 is destructed.\n"); }				};								class B : public virtual A, public A1 {				public:				  B() { printf ("B is constructed.\n"); }				  virtual void xx(int doit) {				    printf ("B is destructed.\n");				    A1::xx (1);				    if (doit) A::xx (1);				  }				};								int num;								class C : public virtual A, public B {				public:				  C() { ++num; printf ("C is constructed.\n");				      ptr = this;				      }				  virtual void xx(int doit) {				    --num;				    if (ptr != this)				      printf("FAIL\n%x != %x\n", ptr, this);				    printf ("C is destructed.\n");				    B::xx (0);				    if (doit) A::xx (1);				  }				};								void fooA(A *a) {				  printf ("Casting to A!\n");				  a->xx (1);				}				void fooA1(A1 *a) {				  printf ("Casting to A1!\n");				  a->xx (1);				}								void fooB(B *b) {				  printf ("Casting to B!\n");				  b->xx (1);				}								void fooC(C *c) {				  printf ("Casting to C!\n");				  c->xx (1);				}								int main(int argc, char *argv[]) {				  printf ("*** Construct C object!\n");				  C *c = new C();								  int i = 0;								  printf ("*** Try to delete the casting pointer!\n");				  switch (i)				    {				    case 0: fooA1(c);				      break;				    case 1: fooA(c);				      break;				    case 2: fooB(c);				      break;				    case 3: fooC(c);				      break;				    }								  return num!=0;				}