排查“***was not declared in this scope“

在调试c++调用c时，发生了“***was not declared in this scope"问题，特此记录
头文件中已经包含了相关.h文件

首先，怀疑是发生了环形依赖问题，排查后发现被调用文件已经包含了条件编译

#ifndef ***_H_
#define ***_H_
...
#endif

其次，程序名也未和其他库中的头文件重名；

最后，发现在c程序的存在除了上述的条件编译外，还存在另一个条件编译

#ifdef COMPONENT

即只有满足该条件下才会编译该程序

解决方案：在include头文件前增加宏定义即可

#define COMPONENT

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排查“***was not declared in this scope“

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