SPM SupportedPlatform for macOS Big Sur

Question

Created Jun ’20

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I'm trying to set up a Swift Package that target's macOS Big Sur.

From the documentation, it looks like v11 should be the new property. https://developer.apple.com/documentation/swift_packages/supportedplatform/macosversion/3632902-v11

Code Block swiftplatforms: [.macOS(.v11)],

But it crashes with the following error.

Code Block error: manifest parse error(s):
Package.swift:9:17: error: reference to member 'v11' cannot be resolved without a contextual type
				.macOS(.v11)

Oddly, an undocumented v10_16 works!

Code Block swiftplatforms: [.macOS(.v10_16)],

Looking at the open source code, it appears both values should work.

https://github.com/apple/swift-package-manager/blob/6cfe2de63e53dd9cb75e7bf910277e699d9383a2/Sources/PackageDescription/SupportedPlatforms.swift#L212-L223

Is there a bug in this release of Xcode's Swift tool chain? What platform property should I be using to target Big Sur?

Xcode Version 12.0 beta (12A6159)

Code Block $ swift --version
Apple Swift version 5.3 (swiftlang-1200.0.16.9 clang-1200.0.22.5)
Target: x86_64-apple-darwin19.5.0

Answered by Developer Tools Engineer in 615879022

The source code you reference is from a later commit than the release of the Swift toolchain that's in Beta 1. For now, use .macOS(.v10_16).

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Answer 1

Developer Tools Engineer OP

Apple

Jun ’20

This looks like a bug in Beta 1 to me, .macOS(.v11) should absolutely work. Would you mind filing a feedback report for this?

1

Answer 2

Developer Tools Engineer OP

Apple

Jun ’20

Accepted Answer

The source code you reference is from a later commit than the release of the Swift toolchain that's in Beta 1. For now, use .macOS(.v10_16).

2