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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 GatheredKit, reference v0.2.0 (ed2b33), with Swift 6.1 for iOS using Xcode 16.3 on 27 Apr 2025 07:18:05 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/JosephDuffy/GatheredKit.git
Reference: v0.2.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/JosephDuffy/GatheredKit
 * tag               v0.2.0     -> FETCH_HEAD
HEAD is now at ed2b330 Add Swift Package Index manifest file
Cloned https://github.com/JosephDuffy/GatheredKit.git
Revision (git rev-parse @):
ed2b33049017e5d3c60e18a700a104647a683751
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/JosephDuffy/GatheredKit.git at v0.2.0
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Build
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Selected platform:         iOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/JosephDuffy/GatheredKit.git
https://github.com/JosephDuffy/GatheredKit.git
error: 'spi-builder-workspace': Invalid manifest (compiled with: ["/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc", "-vfsoverlay", "/var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/TemporaryDirectory.R2vjv9/vfs.yaml", "-L", "/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/pm/ManifestAPI", "-lPackageDescription", "-Xlinker", "-rpath", "-Xlinker", "/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/pm/ManifestAPI", "-target", "arm64-apple-macosx14.0", "-sdk", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk", "-F", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks", "-F", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/PrivateFrameworks", "-I", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib", "-L", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib", "-swift-version", "5", "-I", "/Applications/Xcode-16.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/pm/ManifestAPI", "-sdk", "/Applications/Xcode-16.3.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX15.4.sdk", "-package-description-version", "5.5.0", "/Users/admin/builder/spi-builder-workspace/Package.swift", "-o", "/var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/TemporaryDirectory.kpDVFG/spi-builder-workspace-manifest"])
/Users/admin/builder/spi-builder-workspace/Package.swift:65:6: error: 'package(url:exact:)' is unavailable
63 | #if swift(>=5.6)
64 | package.dependencies.append(
65 |     .package(url: "https://github.com/apple/swift-docc-plugin", exact: "1.0.0")
   |      `- error: 'package(url:exact:)' is unavailable
66 | )
67 | #endif
PackageDescription.Package.Dependency.package:4:24: note: 'package(url:exact:)' was introduced in PackageDescription 5.6
2 |   class Dependency {
3 | @available(_PackageDescription 5.6)
4 |     public static func package(url: String, exact version: Version) -> Package.Dependency  }
  |                        `- note: 'package(url:exact:)' was introduced in PackageDescription 5.6
5 | }
6 |
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: spi-builder-workspace
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-27 00:18:04.370 xcodebuild[500:2888] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-27-04_00-18-0004.xcresult
xcodebuild: error: Could not resolve package dependencies:
  'package(url:exact:)' is unavailable
  <unknown>:0: warning: legacy driver is now deprecated; consider avoiding specifying '-disallow-use-new-driver'
/Users/admin/builder/spi-builder-workspace/Package.swift:65:6: error: 'package(url:exact:)' is unavailable
63 | #if swift(>=5.6)
64 | package.dependencies.append(
65 |     .package(url: "https://github.com/apple/swift-docc-plugin", exact: "1.0.0")
   |      `- error: 'package(url:exact:)' is unavailable
66 | )
67 | #endif
PackageDescription.Package.Dependency.package:4:24: note: 'package(url:exact:)' was introduced in PackageDescription 5.6
2 |   class Dependency {
3 | @available(_PackageDescription 5.6)
4 |     public static func package(url: String, exact version: PackageDescription.Version) -> PackageDescription.Package.Dependency  }
  |                        `- note: 'package(url:exact:)' was introduced in PackageDescription 5.6
5 | }
6 |
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: spi-builder-workspace
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-27 00:18:05.232 xcodebuild[523:3056] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-27-04_00-18-0005.xcresult
xcodebuild: error: Could not resolve package dependencies:
  'package(url:exact:)' is unavailable
  <unknown>:0: warning: legacy driver is now deprecated; consider avoiding specifying '-disallow-use-new-driver'
/Users/admin/builder/spi-builder-workspace/Package.swift:65:6: error: 'package(url:exact:)' is unavailable
63 | #if swift(>=5.6)
64 | package.dependencies.append(
65 |     .package(url: "https://github.com/apple/swift-docc-plugin", exact: "1.0.0")
   |      `- error: 'package(url:exact:)' is unavailable
66 | )
67 | #endif
PackageDescription.Package.Dependency.package:4:24: note: 'package(url:exact:)' was introduced in PackageDescription 5.6
2 |   class Dependency {
3 | @available(_PackageDescription 5.6)
4 |     public static func package(url: String, exact version: PackageDescription.Version) -> PackageDescription.Package.Dependency  }
  |                        `- note: 'package(url:exact:)' was introduced in PackageDescription 5.6
5 | }
6 |
BUILD FAILURE 6.1 iOS