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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Failed to build CryptoKitten, reference 0.2.3 (bf7a4d), with Swift 6.1 for watchOS using Xcode 16.3 on 24 Apr 2025 10:02:00 UTC.

Build Command

No build command. This typically means the build failed at an early stage where we determine the build command.

Build Log

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RunAll
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Builder version: 4.61.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/openkitten/cryptokitten.git
Reference: 0.2.3
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/openkitten/cryptokitten
 * tag               0.2.3      -> FETCH_HEAD
HEAD is now at bf7a4d6 Revert PBKDF2
Cloned https://github.com/openkitten/cryptokitten.git
Revision (git rev-parse @):
bf7a4d6dbd6f4bbd96ae620101239446d2cdd3f9
SUCCESS checkout https://github.com/openkitten/cryptokitten.git at 0.2.3
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Build
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Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/openkitten/cryptokitten.git
https://github.com/openkitten/cryptokitten.git
error: 'spi-builder-workspace': package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
error: fatalError
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 03:01:59.808 xcodebuild[495:2824] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_03-01-0059.xcresult
xcodebuild: error: Could not resolve package dependencies:
  package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 03:02:00.534 xcodebuild[504:2911] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_03-02-0000.xcresult
xcodebuild: error: Could not resolve package dependencies:
  package 'package.swift' is using Swift tools version 3.1.0 which is no longer supported; consider using '// swift-tools-version: 6.1' to specify the current tools version
BUILD FAILURE 6.1 watchOS