linux下编程用 编译软件

				/* Copyright (C) 2003 Free Software Foundation.								   Check that constant folding of built-in math functions doesn't				   break anything and produces the expected results.								   Written by Roger Sayle, 29th July 2003.  */								/* { dg-do link } */				/* { dg-options "-O2 -ffast-math" } */								extern void link_error(void);								extern double pow(double,double);								void test(double x)				{				  if (pow(x,2.0) != x*x)				    link_error ();								  if (x*pow(x,2.0) != pow(x,3.0))				    link_error ();								  if (pow(x,2.0)*x != pow(x,3.0))				    link_error ();								  if (pow(x,3.0) != x*x*x)				    link_error ();								  if (pow(x,2.0)*x != x*x*x)				    link_error ();								  if (x*pow(x,2.0) != x*x*x)				    link_error ();								  if (pow(x,3.0)/x != pow(x,2.0))				    link_error ();								  if (pow(x,3.0)/x != x*x)				    link_error ();				}								int main()				{				  test (2.0);				  return 0;				}