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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 EmbeddedStringsKit, reference main (20a1e3), with Swift 6.1 for Linux on 28 Apr 2025 18:43:00 UTC.

Swift 6 data race errors: 2

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/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 -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: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/FluidGroup/EmbeddedStringsKit.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/FluidGroup/EmbeddedStringsKit
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 20a1e37 { }  (#1)
Cloned https://github.com/FluidGroup/EmbeddedStringsKit.git
Revision (git rev-parse @):
20a1e370cd3bc55be3a3743a9b9295811970d6b8
SUCCESS checkout https://github.com/FluidGroup/EmbeddedStringsKit.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/FluidGroup/EmbeddedStringsKit.git
https://github.com/FluidGroup/EmbeddedStringsKit.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "EmbeddedStringsKit",
  "name" : "EmbeddedStringsKit",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "EmbeddedStringsKit",
      "targets" : [
        "EmbeddedStringsKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EmbeddedStringsKitTests",
      "module_type" : "SwiftTarget",
      "name" : "EmbeddedStringsKitTests",
      "path" : "Tests/EmbeddedStringsKitTests",
      "sources" : [
        "EmbeddedStringsKitTests.swift"
      ],
      "target_dependencies" : [
        "EmbeddedStringsKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "EmbeddedStringsKit",
      "module_type" : "SwiftTarget",
      "name" : "EmbeddedStringsKit",
      "path" : "Sources/EmbeddedStringsKit",
      "product_memberships" : [
        "EmbeddedStringsKit"
      ],
      "sources" : [
        "EmbeddedStringsKit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$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 -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-6.1-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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/4] Emitting module EmbeddedStringsKit
/host/spi-builder-workspace/Sources/EmbeddedStringsKit/EmbeddedStringsKit.swift:43:21: warning: static property 'ja' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
 31 | }
 32 |
 33 | public struct LocalizedStringsLanguage: Hashable {
    |               `- note: consider making struct 'LocalizedStringsLanguage' conform to the 'Sendable' protocol
 34 |
 35 |   public let identifier: String
    :
 41 |   }
 42 |
 43 |   public static let ja = Self.init(identifier: "ja")
    |                     |- warning: static property 'ja' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'ja' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 44 |   public static let en = Self.init(identifier: "en")
 45 |
/host/spi-builder-workspace/Sources/EmbeddedStringsKit/EmbeddedStringsKit.swift:44:21: warning: static property 'en' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
 31 | }
 32 |
 33 | public struct LocalizedStringsLanguage: Hashable {
    |               `- note: consider making struct 'LocalizedStringsLanguage' conform to the 'Sendable' protocol
 34 |
 35 |   public let identifier: String
    :
 42 |
 43 |   public static let ja = Self.init(identifier: "ja")
 44 |   public static let en = Self.init(identifier: "en")
    |                     |- warning: static property 'en' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'en' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 45 |
 46 | }
[4/4] Compiling EmbeddedStringsKit EmbeddedStringsKit.swift
/host/spi-builder-workspace/Sources/EmbeddedStringsKit/EmbeddedStringsKit.swift:43:21: warning: static property 'ja' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
 31 | }
 32 |
 33 | public struct LocalizedStringsLanguage: Hashable {
    |               `- note: consider making struct 'LocalizedStringsLanguage' conform to the 'Sendable' protocol
 34 |
 35 |   public let identifier: String
    :
 41 |   }
 42 |
 43 |   public static let ja = Self.init(identifier: "ja")
    |                     |- warning: static property 'ja' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'ja' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 44 |   public static let en = Self.init(identifier: "en")
 45 |
/host/spi-builder-workspace/Sources/EmbeddedStringsKit/EmbeddedStringsKit.swift:44:21: warning: static property 'en' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
 31 | }
 32 |
 33 | public struct LocalizedStringsLanguage: Hashable {
    |               `- note: consider making struct 'LocalizedStringsLanguage' conform to the 'Sendable' protocol
 34 |
 35 |   public let identifier: String
    :
 42 |
 43 |   public static let ja = Self.init(identifier: "ja")
 44 |   public static let en = Self.init(identifier: "en")
    |                     |- warning: static property 'en' is not concurrency-safe because non-'Sendable' type 'LocalizedStringsLanguage' may have shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: add '@MainActor' to make static property 'en' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 45 |
 46 | }
Build complete! (5.42s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "EmbeddedStringsKit",
  "name" : "EmbeddedStringsKit",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "EmbeddedStringsKit",
      "targets" : [
        "EmbeddedStringsKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EmbeddedStringsKitTests",
      "module_type" : "SwiftTarget",
      "name" : "EmbeddedStringsKitTests",
      "path" : "Tests/EmbeddedStringsKitTests",
      "sources" : [
        "EmbeddedStringsKitTests.swift"
      ],
      "target_dependencies" : [
        "EmbeddedStringsKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "EmbeddedStringsKit",
      "module_type" : "SwiftTarget",
      "name" : "EmbeddedStringsKit",
      "path" : "Sources/EmbeddedStringsKit",
      "product_memberships" : [
        "EmbeddedStringsKit"
      ],
      "sources" : [
        "EmbeddedStringsKit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
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.