iOS Xcode 10: Multiple commands produce

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Xcode自动升级到10.0

1.编译的时候报错：
Multiple commands produce

解决办法：
File -> Workspace Setting -> build system: legacy build system

参考：
https://www.jianshu.com/p/8a8444acdca5

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2.library not found for -lstdc++.6.0.9

临时解决办法
拷贝缺失的 libstdc++、libstdc++.6、libstdc++6.0.9
到
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/ (真机地址)

下载地址连接 链接: https://pan.baidu.com/s/19Ko_DRV0Z1W5Tl3y0zYz2g 提取码: rsya

参考：
https://my.oschina.net/iceTear/blog/2050270

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