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 see you have solved the problem by upgrading to Swift 3.0.

I encountered the same problem, and did some research in this. When building within Xcode, make sure you have the setting " Project > Build Settings > Use Legacy Swift Language Version" set to "Yes"

For those who are using xcrun or xcodebuild tools, I managed to solve it by using an extra option 'toolchain'

xcrun --toolchain "com.apple.dt.toolchain.Swift_2_3"
xcodebuild -toolchain "com.apple.dt.toolchain.Swift_2_3"

The identifier "com.apple.dt.toolchain.Swift_2_3" can be found at:

/Applications/Xcode-beta.app/Contents/Developer/Toolchains/Swift_2.3.xctoolchain/ToolchainInfo.plist

Hope this helps for those who are developing in Swift 2.3.

Source: https://marc.ttias.be/swift-users/2016-08/msg00188.php