用于进行gcc测试

				/* Copyright (C) 2003  Free Software Foundation.								   Verify that all the __builtin_cabs? functions are recognized				   by the compiler.  Complex numbers are not supported with the				   gcc.dg default "-pedantic-errors" option, so the dg-options				   overrides this.								   Written by Roger Sayle, 1st June 2003.  */								/* { dg-do compile } */				/* { dg-options "-O -ansi" } */				/* { dg-final { scan-assembler-not "__builtin_" } } */								double test(__complex__ double x)				{				  return __builtin_cabs (x);				}								float testf(__complex__ float x)				{				  return __builtin_cabsf (x);				}								long double testl(__complex__ long double x)				{				  return __builtin_cabsl (x);				}