我最近在学一个调度器，使用到_LINE_这个东西，网上查找到这个是C语言内置宏定义，切我在KEIL中编译没有问题，但是在ICCAVR中使用ATMEGA16实现这个调度器是出现如下问题：
!E C:\iccv7avr\examples.avr\protothread\led.c(17): undeclared identifier `_LINE_'
!E C:\iccv7avr\examples.avr\protothread\led.c(17): case label must be a constant integer expression
!W C:\iccv7avr\examples.avr\protothread\led.c(18):[warning] reference to `volatile unsigned char' elided
!W C:\iccv7avr\examples.avr\protothread\led.c(18):[warning] expression with no effect elided
!W C:\iccv7avr\examples.avr\protothread\led.c(24):[warning] missing return value- #define BEGIN static unsigned char _lc=0; switch(_lc){case 0:
- #define END ;}; _lc=0;
- #define WaitX(tim) _lc=_LINE_+((_LINE_%256)==0);return tim;case _LINE_+((_LINE_%256)==0):
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