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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

Successful build of swifty-holidays, reference main (5e39b8), with Swift 6.1 for Linux on 29 Apr 2025 11:14:01 UTC.

Swift 6 data race errors: 0

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/sersoft-gmbh/swifty-holidays.git
Reference: main
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/sersoft-gmbh/swifty-holidays
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 5e39b80 Add Swift 6.0 support
Cloned https://github.com/sersoft-gmbh/swifty-holidays.git
Revision (git rev-parse @):
5e39b80667ee0b1e95227b7f5855bcb1b8b57f14
SUCCESS checkout https://github.com/sersoft-gmbh/swifty-holidays.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/sersoft-gmbh/swifty-holidays.git
https://github.com/sersoft-gmbh/swifty-holidays.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "swifty-holidays",
  "name" : "swifty-holidays",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.13"
    },
    {
      "name" : "ios",
      "version" : "12.0"
    },
    {
      "name" : "tvos",
      "version" : "12.0"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftyHolidays",
      "targets" : [
        "SwiftyHolidays"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftyHolidaysTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftyHolidaysTests",
      "path" : "Tests/SwiftyHolidaysTests",
      "sources" : [
        "CalculationContextReferenceTests.swift",
        "CalculatorTests.swift",
        "Gregorian/GregorianCalculatorTests.swift",
        "Gregorian/GregorianContextTests.swift",
        "HolidayDateTests.swift"
      ],
      "target_dependencies" : [
        "SwiftyHolidays"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftyHolidays",
      "module_type" : "SwiftTarget",
      "name" : "SwiftyHolidays",
      "path" : "Sources/SwiftyHolidays",
      "product_memberships" : [
        "SwiftyHolidays"
      ],
      "sources" : [
        "CalculationCalendar.swift",
        "CalculationContext.swift",
        "CalculationContextReference.swift",
        "CalculationPromise.swift",
        "Calculator.swift",
        "Gregorian/GregorianCalculator.swift",
        "Gregorian/GregorianContext.swift",
        "HolidayDate.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://github.com/apple/swift-docc-plugin
[1/2049] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (0.37s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.3 (2.26s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3376] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.34s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (0.86s)
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.4.3
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/4] Write sources
[3/4] Write swift-version-24593BA9C3E375BF.txt
[5/12] Compiling SwiftyHolidays GregorianContext.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[6/13] Compiling SwiftyHolidays HolidayDate.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[7/13] Compiling SwiftyHolidays CalculationCalendar.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[8/13] Emitting module SwiftyHolidays
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[9/13] Compiling SwiftyHolidays GregorianCalculator.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[10/13] Compiling SwiftyHolidays CalculationPromise.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[11/13] Compiling SwiftyHolidays CalculationContext.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[12/13] Compiling SwiftyHolidays CalculationContextReference.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
[13/13] Compiling SwiftyHolidays Calculator.swift
<unknown>:0: warning: upcoming feature 'GlobalConcurrency' is already enabled as of Swift version 6
Build complete! (21.81s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "swifty-holidays",
  "name" : "swifty-holidays",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.13"
    },
    {
      "name" : "ios",
      "version" : "12.0"
    },
    {
      "name" : "tvos",
      "version" : "12.0"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftyHolidays",
      "targets" : [
        "SwiftyHolidays"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftyHolidaysTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftyHolidaysTests",
      "path" : "Tests/SwiftyHolidaysTests",
      "sources" : [
        "CalculationContextReferenceTests.swift",
        "CalculatorTests.swift",
        "Gregorian/GregorianCalculatorTests.swift",
        "Gregorian/GregorianContextTests.swift",
        "HolidayDateTests.swift"
      ],
      "target_dependencies" : [
        "SwiftyHolidays"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftyHolidays",
      "module_type" : "SwiftTarget",
      "name" : "SwiftyHolidays",
      "path" : "Sources/SwiftyHolidays",
      "product_memberships" : [
        "SwiftyHolidays"
      ],
      "sources" : [
        "CalculationCalendar.swift",
        "CalculationContext.swift",
        "CalculationContextReference.swift",
        "CalculationPromise.swift",
        "Calculator.swift",
        "Gregorian/GregorianCalculator.swift",
        "Gregorian/GregorianContext.swift",
        "HolidayDate.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "6.0"
}
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Done.