Where is Xcode's “TOOLCHAINS” set?

Question

I upgraded my project from Swift 2.2 to 2.3 (Xcode 7 to 8), and committed everything on one Mac. When I pulled from git on my other Mac, and built, I get:

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Answer 1

Toolchains are set under the Xcode menu then Toolchains. It should be set to Xcode 8. There is also a build setting in Xcode 8 called "Use legacy swift version" that should be set to YES so that you use Swift 2.3 instead of 3.