用于进行gcc测试

				/* Uninitialized variable warning tests...				   Inspired by part of optabs.c:expand_binop.				   May be the same as uninit-1.c.  */								/* { dg-do compile } */				/* { dg-options "-O -Wuninitialized" } */								#include 								void				add_bignums (int *out, int *x, int *y)				{				    int p, sum;				    int carry; /* { dg-bogus "carry" "uninitialized variable warning" } */								    p = 0;				    for (; *x; x++, y++, out++, p++)				    {					if (p)					    sum = *x + *y + carry;					else					    sum = *x + *y;									if (sum < 0)					{					    carry = 1;					    sum -= INT_MAX;					}					else					    carry = 0;				    }				}