概述
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
extern const char *names[];In some .c file:
const 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:
struct Foo {
float baryness;
float baziness;
};
extern struct Foo TheFoo;In one C file:
#include "mydata.h"
struct Foo TheFoo; //实例化In other headers in the project:
#include "mydata.h"
printf("the baziness is %f right nown", TheFoo.baziness);最后
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