最近经常遇到这个报错:
Implicit declaration of function 'select' is invalid in C99
还有这个:
Declaration of 'select' must be imported from module 'Darwin.POSIX.sys.time' before it is required
如下图:

解决办法:
导入头文件:#include <sys/time.h>
最近经常遇到这个报错:
Implicit declaration of function 'select' is invalid in C99
还有这个:
Declaration of 'select' must be imported from module 'Darwin.POSIX.sys.time' before it is required
导入头文件:#include <sys/time.h>
本文标题:Xcode 9 遇到:Implicit declaration
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