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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 Ocelot, reference master (c89a20), with Swift 6.1 for watchOS using Xcode 16.3 on 25 Apr 2025 05:21:38 UTC.

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/openkitten/ocelot.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/openkitten/ocelot
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at c89a208 Newer cheetah JSON
Cloned https://github.com/openkitten/ocelot.git
Revision (git rev-parse @):
c89a2084a7a158be25a622bddfffa73ec1d4d200
SUCCESS checkout https://github.com/openkitten/ocelot.git at master
========================================
Build
========================================
Selected platform:         watchOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/openkitten/ocelot.git
https://github.com/openkitten/ocelot.git
{
  "dependencies" : [
    {
      "identity" : "cheetah",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "2.0.0",
            "upper_bound" : "3.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/OpenKitten/Cheetah.git"
    },
    {
      "identity" : "cryptokitten",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.2.1",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/OpenKitten/CryptoKitten.git"
    }
  ],
  "manifest_display_name" : "Ocelot",
  "name" : "Ocelot",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Ocelot",
      "targets" : [
        "Ocelot"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "OcelotTests",
      "module_type" : "SwiftTarget",
      "name" : "OcelotTests",
      "path" : "Tests/OcelotTests",
      "sources" : [
        "OcelotTests.swift"
      ],
      "target_dependencies" : [
        "Ocelot"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Ocelot",
      "module_type" : "SwiftTarget",
      "name" : "Ocelot",
      "path" : "Sources/Ocelot",
      "product_dependencies" : [
        "Cheetah",
        "CryptoKitten"
      ],
      "product_memberships" : [
        "Ocelot"
      ],
      "sources" : [
        "Base64.swift",
        "JWS.swift",
        "JWSCodable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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
Fetching from https://github.com/OpenKitten/Cheetah.git
Fetching from https://github.com/OpenKitten/CryptoKitten.git
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 versionResolve Package Graph
Updating from https://github.com/OpenKitten/Cheetah.git
Updating from https://github.com/OpenKitten/CryptoKitten.git
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 versionResolve Package Graph
Updating from https://github.com/OpenKitten/Cheetah.git
Updating from https://github.com/OpenKitten/CryptoKitten.git
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 22:21:37.573 xcodebuild[511:2811] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_22-21-0037.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
Updating from https://github.com/OpenKitten/Cheetah.git
Updating from https://github.com/OpenKitten/CryptoKitten.git
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 22:21:38.822 xcodebuild[682:3576] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_22-21-0038.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