出错原因：一般是因为在头文件里进行了定义或者实例化，导致多重定义，记住在头文件里只进行声明。
1、Don't define variables in headers. Put declarations in header and definitions in one of the .c files.
In config.h
1extern const char *names[];
In some .c file:
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4const char *names[] = { "brian", "stefan", "steve" };
If you put a definition of a global variable in a header file, then this definition will go to every .c file that includes this header, and you will get multiple definition error because a varible may be declared multiple times but can be defined only once.
2、You must never instantiate（实例化）things in header files, i.e. never define anything, just declare them.
You should put a single definition of each declared thing in one of the C files, and have extern declarations in the shared header:
In mydata.h:
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6struct Foo { float baryness; float baziness; }; extern struct Foo TheFoo;
In one C file:
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3#include "mydata.h" struct Foo TheFoo; //实例化
In other headers in the project:
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3#include "mydata.h" printf("the baziness is %f right nown", TheFoo.baziness);
最后
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