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

I had the same warning and i could solve the problem by cleaning the build folder (alt+shift+cmd+K)