在C++环境下使用C函数的时候，常常会出现编译器无法找到obj模块中的C函数定义，从而导致链接失败的情况，这是因为C++语言在编译的时候为了解决函数的多态问题，会将函数名和参数联合起来生成一个中间的函数名称，而C语言则不会，因此会造成链接时找不到对应函数的情况，此时C函数就需要用extern “C”进行链接指定，这告诉编译器，请保持我的名称，不要给我生成用于链接的中间函数名。
但有时还会出现
ms.h:29: error: previous declaration of 'int function(int)' with 'C++' linkage
main.cpp:24: error: conflicts with new declaration with 'C' linkage
这是因为在c++的文件中用extern定义过了函数，而又包含了该函数所在的.h文件头文件，只要把.h文件引用删除即可。
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