linux下编程用 编译软件

				/* Copyright (C) 2002 Free Software Foundation, Inc.  */								/* { dg-do preprocess } */								/* Source: Neil Booth, 26 Feb 2002.								   Test that we allow directives in macro arguments.  */								/* { dg-do run } */				/* { dg-options "" } */								#define f(x) x				extern void abort (void);								int main ()				{				  if (f (				#if f(1)			/* True.  */					0))			/* False. */				#else				    	1))				#endif				     abort ();								     /* Outer f expands to original definition, f in argument expands					to new definition, so result is: if (1 != 2 - 1).  */				     if (1 != f(2				#undef f				#define f - 1				     f))				     abort ();								     return 0;				}