Good news! Apple has released a new version Xcode 16.
Swift 6 compiler, is the 1st version of Swift 6 language mode means, when you install Xcode 16, you get the new llvm compiler and you get Swift 6 language support with it. We can check your version by running swiftc –version in terminal. Because Swift 6 language mode – is an opting feature (not a mandatory one).
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For Swift Package Manager (SPM) packages, don’t confuse the swift-tools-version with the Swift language version. The swift-tools-version specified at the top of your Package.swift Package.swift file only sets the minimum Swift version required to build the package. To upgrade your package to Swift 6, you need to explicitly adopt the following Swift setting:
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If you only want to enable strict concurrency checking, you can update your build settings accordingly. Some of you might have already experimented with this, as it was available in Xcode 15 for projects using Swift 5.10. Has anyone tried it in Xcode 15 yet?
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If you're using Xcode 15 and Swift 5.9, you'll need to enable the experimentalFeature compiler flag to activate strict concurrency checking.
In Xcode 16 with Swift 5, you'll use the upcomingFeature flag for this purpose.
In Xcode 16 with Swift 6, strict concurrency checks are enabled by default.
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Non-isolated function: By default, everything in Swift is non-isolated unless specified otherwise.
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You can track the adoption of Swift 6 in popular packages by visiting swiftpackageindex.com. This platform provides updates on package compatibility and how widely Swift 6 features are being integrated across the ecosystem.
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