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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 LocaleSupport, reference 0.6.0 (713795), with Swift 6.0 for Linux on 29 Mar 2025 15:45:45 UTC.

Swift 6 data race errors: 3

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-latest swift build --triple x86_64-unknown-linux-gnu -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.60.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/richardpiazza/LocaleSupport.git
Reference: 0.6.0
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/richardpiazza/LocaleSupport
 * tag               0.6.0      -> FETCH_HEAD
HEAD is now at 713795a Sendable & Retroactive Attributes (#11)
Cloned https://github.com/richardpiazza/LocaleSupport.git
Revision (git rev-parse @):
713795ac3cc73f2f340723ace514ac6cee3dfe1e
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/richardpiazza/LocaleSupport.git at 0.6.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.0
Building package at path:  $PWD
https://github.com/richardpiazza/LocaleSupport.git
https://github.com/richardpiazza/LocaleSupport.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "default_localization" : "en",
  "dependencies" : [
  ],
  "manifest_display_name" : "LocaleSupport",
  "name" : "LocaleSupport",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "15.0"
    },
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    }
  ],
  "products" : [
    {
      "name" : "LocaleSupport",
      "targets" : [
        "LocaleSupport"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "LocaleSupportTests",
      "module_type" : "SwiftTarget",
      "name" : "LocaleSupportTests",
      "path" : "Tests/LocaleSupportTests",
      "resources" : [
        {
          "path" : "/host/spi-builder-workspace/Tests/LocaleSupportTests/Resources/en.lproj/Localizable.strings",
          "rule" : {
            "process" : {
              "localization" : "en"
            }
          }
        }
      ],
      "sources" : [
        "LocalizedStringConvertibleTests.swift",
        "LocalizedStrings.swift"
      ],
      "target_dependencies" : [
        "LocaleSupport"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LocaleSupport",
      "module_type" : "SwiftTarget",
      "name" : "LocaleSupport",
      "path" : "Sources/LocaleSupport",
      "product_memberships" : [
        "LocaleSupport"
      ],
      "sources" : [
        "LanguageCode.swift",
        "Locale+LocaleSupport.swift",
        "LocaleSupportConfiguration.swift",
        "LocaleSupportError.swift",
        "LocalizedStringConvertible.swift",
        "RegionCode.swift",
        "ScriptCode.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-latest swift build --triple x86_64-unknown-linux-gnu -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures 2>&1
basic-6.0-latest: Pulling from finestructure/spi-images
Digest: sha256:081dcf4fb829aea9d08447f4790431afbdfbcc335bfeed728ca69c6f181ae2aa
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.0-latest
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/10] Compiling LocaleSupport ScriptCode.swift
[4/10] Compiling LocaleSupport RegionCode.swift
/host/spi-builder-workspace/Sources/LocaleSupport/RegionCode.swift:262:23: warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
260 |     case ZW
261 |
262 |     public static var `default`: Self = .US
    |                       |- warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'default' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'default' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
263 | }
264 |
[5/10] Compiling LocaleSupport LocalizedStringConvertible.swift
/host/spi-builder-workspace/Sources/LocaleSupport/LocaleSupportConfiguration.swift:7:23: warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
5 |
6 |     /// Characters that will be prepended/appended to any default `LocalizedStringConvertible` implementation.
7 |     public static var defaultIndicators: (prefix: Character, suffix: Character)?
  |                       |- warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  |                       |- note: convert 'defaultIndicators' to a 'let' constant to make 'Sendable' shared state immutable
  |                       |- note: annotate 'defaultIndicators' with '@MainActor' if property should only be accessed from the main actor
  |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
8 | }
9 |
[6/10] Compiling LocaleSupport LocaleSupportError.swift
[7/10] Emitting module LocaleSupport
/host/spi-builder-workspace/Sources/LocaleSupport/LanguageCode.swift:602:23: warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
600 |     case zza
601 |
602 |     public static var `default`: Self = .en
    |                       |- warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'default' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'default' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
603 | }
604 |
/host/spi-builder-workspace/Sources/LocaleSupport/LocaleSupportConfiguration.swift:7:23: warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
5 |
6 |     /// Characters that will be prepended/appended to any default `LocalizedStringConvertible` implementation.
7 |     public static var defaultIndicators: (prefix: Character, suffix: Character)?
  |                       |- warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  |                       |- note: convert 'defaultIndicators' to a 'let' constant to make 'Sendable' shared state immutable
  |                       |- note: annotate 'defaultIndicators' with '@MainActor' if property should only be accessed from the main actor
  |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
8 | }
9 |
/host/spi-builder-workspace/Sources/LocaleSupport/RegionCode.swift:262:23: warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
260 |     case ZW
261 |
262 |     public static var `default`: Self = .US
    |                       |- warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'default' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'default' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
263 | }
264 |
[8/10] Compiling LocaleSupport LocaleSupportConfiguration.swift
/host/spi-builder-workspace/Sources/LocaleSupport/LocaleSupportConfiguration.swift:7:23: warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
5 |
6 |     /// Characters that will be prepended/appended to any default `LocalizedStringConvertible` implementation.
7 |     public static var defaultIndicators: (prefix: Character, suffix: Character)?
  |                       |- warning: static property 'defaultIndicators' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  |                       |- note: convert 'defaultIndicators' to a 'let' constant to make 'Sendable' shared state immutable
  |                       |- note: annotate 'defaultIndicators' with '@MainActor' if property should only be accessed from the main actor
  |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
8 | }
9 |
[9/10] Compiling LocaleSupport LanguageCode.swift
/host/spi-builder-workspace/Sources/LocaleSupport/LanguageCode.swift:602:23: warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
600 |     case zza
601 |
602 |     public static var `default`: Self = .en
    |                       |- warning: static property 'default' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'default' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: annotate 'default' with '@MainActor' if property should only be accessed from the main actor
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
603 | }
604 |
[10/10] Compiling LocaleSupport Locale+LocaleSupport.swift
Build complete! (10.89s)
Build complete.
{
  "default_localization" : "en",
  "dependencies" : [
  ],
  "manifest_display_name" : "LocaleSupport",
  "name" : "LocaleSupport",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "15.0"
    },
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "tvos",
      "version" : "15.0"
    },
    {
      "name" : "watchos",
      "version" : "8.0"
    }
  ],
  "products" : [
    {
      "name" : "LocaleSupport",
      "targets" : [
        "LocaleSupport"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "LocaleSupportTests",
      "module_type" : "SwiftTarget",
      "name" : "LocaleSupportTests",
      "path" : "Tests/LocaleSupportTests",
      "resources" : [
        {
          "path" : "/host/spi-builder-workspace/Tests/LocaleSupportTests/Resources/en.lproj/Localizable.strings",
          "rule" : {
            "process" : {
              "localization" : "en"
            }
          }
        }
      ],
      "sources" : [
        "LocalizedStringConvertibleTests.swift",
        "LocalizedStrings.swift"
      ],
      "target_dependencies" : [
        "LocaleSupport"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LocaleSupport",
      "module_type" : "SwiftTarget",
      "name" : "LocaleSupport",
      "path" : "Sources/LocaleSupport",
      "product_memberships" : [
        "LocaleSupport"
      ],
      "sources" : [
        "LanguageCode.swift",
        "Locale+LocaleSupport.swift",
        "LocaleSupportConfiguration.swift",
        "LocaleSupportError.swift",
        "LocalizedStringConvertible.swift",
        "RegionCode.swift",
        "ScriptCode.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8"
}
basic-6.0-latest: Pulling from finestructure/spi-images
Digest: sha256:081dcf4fb829aea9d08447f4790431afbdfbcc335bfeed728ca69c6f181ae2aa
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.0-latest
Done.