出现下面那些警告应该怎么改？求告知！
#include<reg52.h>
#include <intrins.h>
#define uint unsigned int
#define uchar unsigned char
uchar temp;
void delay(uint);
void main()
{
temp=0xfe;
P1=temp;
while(1)
{
temp=0xfe;
P1=temp;
temp=_crol_(temp,1);
delay(600);
P1=temp;
delay(600);
while(1)
{
temp=_crol_(temp,1);
delay(60);temp=_crol_(temp,1);
P1=temp;
}
}
}
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: _DELAY
MODULE: .\Objects\kuhanshudediaoyong.obj (KUHANSHUDEDIAOYONG)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _DELAY
MODULE: .\Objects\kuhanshudediaoyong.obj (KUHANSHUDEDIAOYONG)
ADDRESS: 0021H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _DELAY
MODULE: .\Objects\kuhanshudediaoyong.obj (KUHANSHUDEDIAOYONG)
ADDRESS: 002BH
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _DELAY
MODULE: .\Objects\kuhanshudediaoyong.obj (KUHANSHUDEDIAOYONG)
ADDRESS: 003FH
Program Size: data=10.0 xdata=0 code=94
