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Comment by mrsteveman1 | Hacker News Reader

> In the meantime, I'm thinking of reverting to Xcode 7.3 and running the two versions side by side... Is that possible ?

I think you're probably better off just keeping Xcode 8 by itself, but use Swift 2.3 for projects if you need to. There are very very few differences between 2.2 and 2.3, converting existing code over is much faster than 2.2 -> 3.0.

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Tried that, but it seems the build setting now needs an explicit SWIFT_VERSION configured .. And carthage dependencies don't have that so the build fails.

Basically, I couldn't get my carthage dependencies to compile with Swift 2.3, so I went the Swift3 route, which now, after 10 hours wasted, was such a bad idea!

Appstore was bugging me to update Xcode so I caved in and now I'm stuck with a project that doesn't build and the deadline approaching fast. Such a useless waste of time.

To placate Carthage dependencies that complain about a missing SWIFT_VERSION configuration, try setting the TOOLCHAINS environment variable.

  TOOLCHAINS=com.apple.dt.toolchain.Swift_2_3 carthage bootstrap

This is the thing I've been looking for !

Thank you for the 63 characters of wisdom, my project now builds !

Yes, this is what Swift 2.3 is for.

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