IAR警告Warning[w31]:……Modules have been compiled with possibly incompatible settings:Module xxx……

Warning[w31]: Modules have been compiled with possibly incompatible settings: Module xxx uses signed plain chars, while module ?xwstold uses unsigned plain chars

第一次用IAR,编译报了1000多个这样的警告。
IAR警告Warning[w31]:……Modules have been compiled with possibly incompatible settings:Module xxx……
错误的原因是建工程的时候按照以前的习惯勾选了将char默认为signed char,而我使用的官方库文件默认的是将char默认为unsigned char。
IAR警告Warning[w31]:……Modules have been compiled with possibly incompatible settings:Module xxx……
改为将char默认为unsigned char后就没有这些警告了
IAR警告Warning[w31]:……Modules have been compiled with possibly incompatible settings:Module xxx……