1.Implicit declaration of function 'XXXXXXXXXX' is invalid in C99问题

其他方法试了都不行，但在设置Build Setting>>>Architectures>>>Vaild Architectures,然后把arm64和armv7s去掉。和设置Valid_ARCHs 值为arm64

www.jianshu.com/p/9cae72b23…

developer.apple.com/documentati…

2.Xcode解决libstdc++和Libstdc-.6.0.9-files问题

github.com/sy5075391/X…

github.com/cy920820/Li…