关于Xcode6编译变动 “Implicit declaration of function 'sysctl' is invalid in C99” 报错问题
以前代码在Xcode5.1上面跑的好好的，可是自从升级到6.0以后，就常常出现编译报错问题。后来查阅的相关资料，好像是Xcode为了兼容Swift语言，更换来编译系统（名字忘记了）。因而就报了一个C语言的C99编译错误，不说了，直接上代码。linux 通常出现该问题是由于经过C调用了unix/linux 底层接口，因此须要调整c语言的编译选项，设置方法见下图：(根据实际状况选择相应的编译选项)
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