错误名：Multiple commands produce '/Users/xxx/Library/Developer/Xcode/DerivedData/UBox-decttscrvofqymensnmevmwoxtjh/Build/Products/Debug-iphoneos/xxx.app'
解决如下：
1、XCode | File | WorkSpace Settings
2、选择 Legacy Build system
错误名：Multiple commands produce '/Users/xxx/Library/Developer/Xcode/DerivedData/UBox-decttscrvofqymensnmevmwoxtjh/Build/Products/Debug-iphoneos/xxx.app'
解决如下：
本文标题：解决升级XCode10旧项目报错
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