linux下编程用 编译软件

				// { dg-do run  }				// { dg-options "-O2" }				// Test that built-in functions are recognized with a prototype.				// Origin: Roger Sayle  Mar 20, 2002				// Copyright (C) 2002 Free Software Foundation.				//								extern "C" void link_error (void);								namespace std {				typedef __SIZE_TYPE__ size_t;				extern "C" size_t strlen (const char*);				}								int				main ()				{				  if (std::strlen ("foo") != 3)				    link_error ();				  return 0;				}