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IAR编译问题

协议栈:mesh1.0

IAR版本:V9.30

1.本来好好的,改动了些东西再编译就提示

Warning[w57]: The file D:.............\Projects\zstack\Samples\GenericApp\CC2530DB\EndDeviceEB\Obj\OSAL_Math.r51 is empty

and will be ignored.

Error[e46]: Undefined external "osalMcuDivide31By16To16" referred in OSAL_Clock.........

2.还有就是平时改动些底层的东西就没法一次编译过去。乱七八糟的报错,一项一项的编译一点问题都没有,最后再统一编译一次才好。太浪费时间了

请问有没有大神知道这两个问题的原因?这协议栈搞得想哭啊。