https://blog.csdn.net/SharkToping/article/details/82759891
1.Multiple commands 的错误
选中Xcode ---File ---Workspace settings
选择下边的
具体方法: 前往 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib
找到libstdc++6.0.9.tbd 复制一份到
xcode 10.0 中
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib
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