Xcode解决“Implicit declaration of function 'XXX' is invalid in C99” 警告或报错

1.Build Setting>>>C Language Dialect,然后选择GNU99[-std=gnu99] (选择看项目实际要求)。 2.Build Setting>>>Architectures>>>Vaild Architectures,然后把arm64和armv7s去掉。 3.Build Setting>>>Architectures>>>Build Active Architec

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