问题一
编译报错
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:-1: Multiple commands produce '/Users/duning/Library/Developer/Xcode/DerivedData/XGB-bvlwqwfpzltpeyarupiguxtqzrdn/Build/Products/Debug-iphonesimulator/XGB.app/README.txt':
解决办法
File > Workspace Settings > Build System > Legacy Build System
问题二
编译报找不到
libstdc++.6.0.9.tbd
解决办法
从老版本xcode拷贝库放到这两个路径
或者点这个链接下载
链接：https://pan.baidu.com/s/1PUWpSL-SzSpnTmjvWonyGQ 密码：R276 解压
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr
问题三
如果报
iPhone has denied the launch request
点击链接下载xcode 9 等稳定再升10
https://developer.apple.com/download/more/