"Implicit declaration of function 'sysctl' is invalid in C99” 报错问题
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在做OpenGL ES 时遇到了这个问题,先用了下面的办法:
默认是GNU99[-std=gnu99],我改成图片中的89,之后发现又报了下面的错:
Implicit declaration of function 'sysctl'
原因是:在函数所在的c文件中定义了,但是没有在与之相关联的.h文件中声明
于是我在 .h 文件中加上了:#define STRINGIFY(A) #A
成功(于是我又将89改回99没毛病,原来跟99没什么关系)
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