undefined first referenced
>> Compilation failure
symbol in file
--------- ----------------
P1DIR ./cry1602.obj
P1IN ./cry1602.obj
P1OUT ./cry1602.obj
P2DIR ./cry1602.obj
P2IN ./cry1602.obj
P2OUT ./cry1602.obj
TA0CCR0 ./cry1602.obj
TA0CTL ./cry1602.obj
WDTCTL ./cry1602.obj
这是什么意思?求大神帮忙,P2DIR之类的不是在头文件里面有定义了吗?为什么还会出现这样的情况
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