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错误原因：

You probably either a) include a header that includes a header that is later included, etc. ... i.e. the same header is included more than once, or b) you declare a function or static variable in multiple places with different types.

解决方法：

#ifndef HEADER_FILE_NAME#define HEADER_FILE_NAME   stuff goes here#endif

also globals must be defined in one place, extern everywhere else,

#ifdef MAIN_C   (put #define MAIN_C in your main.c file)int master_count;#elseextern int master_count;#endif

I usually put all my globals in one struct, so as I refer to them, like global.name to make it clear in the code

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