library not found for -libstdc++.6.0.9
新版本的Xcode中放弃了libstdc++，换成了libc++所以我们需要把libstdc++加入Xcode库中，网上有好事之徒已经准备好了脚本，放在Github上，Clone下来执行一下就好了。
https://github.com/devdawei/libstdc-
Multiple commands produce ... Info.plist
这个问题：在Target->...->Build Phases->Copy Bundle Resources中删除Info.plist项
Multiple commands produce '/Users/jilili/Library/Developer/Xcode/DerivedData/DeliverWater-cilpweqkhyrxtldozyucxqtgwzaa/Build/Products/Debug-iphonesimulator/DeliverWater.app/Info.plist': 1) Target 'DeliverWater' (project 'DeliverWater') has copy command from '/Users/jilili/Projects/mgy/DeliverWateriOS/DeliverWater/Tools/MJExtension/Info.plist' to '/Users/jilili/Library/Developer/Xcode/DerivedData/DeliverWater-cilpweqkhyrxtldozyucxqtgwzaa/Build/Products/Debug-iphonesimulator/DeliverWater.app/Info.plist' 2) Target 'DeliverWater' (project 'DeliverWater') has process command with output '/Users/jilili/Library/Developer/Xcode/DerivedData/DeliverWater-cilpweqkhyrxtldozyucxqtgwzaa/Build/Products/Debug-iphonesimulator/DeliverWater.app/Info.plist'