I updated my Xcode two days ago. After the update, I got a warning error about ToolChain failure:
/Library/Developer/Toolchains/swift-2.2-SNAPSHOT-2015-12-10-a.xctoolchain:1:1: failed to load toolchain: 'Version' parse error: Could not parse version component from: 'swift-2'
There is no further explanation about this error in Xcode. After Google search, I found one solution. It seems that it is caused by Xcode missing remove it when I did Xcode update.
As in the suggestion, the tool chain has to be removed from /Library/Developer/ToolChain/. In my case, there are two items in the direct:
$ ls
swift-2.2-SNAPSHOT-2015-12-10-a.xctoolchain
swift-latest.xctoolchain
The first one is a directry, and the second is a link to the directory. For safe case, I use Finder to the directory, and compress those two items first as Archive.zip. Then Remove them completely.
I have to quit Xcode and relaunch Xcode again to do clean build. This time warning error is gone.
My Update Xcode 12.0
I had Xcode update frustrating experience before. There was one time the updated Xcode version could not build my project. I had to rollback to old version from TimeMachine backup.
From that experience, I have been kept copy of previous Xcode to external disk first. Then I remove Xcode from Applications. In this way, this time I did clean installation of Xcode 12.0. Another reason is that I do not have enough space in my hard disk to do update. I had to remove old version to get more space.
This clean installation may missed the step to remove ToolChain.
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