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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 SemanticVersion, reference main (263730), with Swift 6.1 for Linux on 27 Apr 2025 03:18:34 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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 -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/elegantchaos/SemanticVersion.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/elegantchaos/SemanticVersion
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 2637309 proper comparable support
Cloned https://github.com/elegantchaos/SemanticVersion.git
Revision (git rev-parse @):
2637309c72c1415cc3d1ea27ae6ddb2a2b66ecf0
SUCCESS checkout https://github.com/elegantchaos/SemanticVersion.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/elegantchaos/SemanticVersion.git
https://github.com/elegantchaos/SemanticVersion.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SemanticVersion",
  "name" : "SemanticVersion",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "SemanticVersion",
      "targets" : [
        "SemanticVersion"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SemanticVersionTests",
      "module_type" : "SwiftTarget",
      "name" : "SemanticVersionTests",
      "path" : "Tests/SemanticVersionTests",
      "sources" : [
        "SemanticVersionTests.swift"
      ],
      "target_dependencies" : [
        "SemanticVersion"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SemanticVersion",
      "module_type" : "SwiftTarget",
      "name" : "SemanticVersion",
      "path" : "Sources/SemanticVersion",
      "product_memberships" : [
        "SemanticVersion"
      ],
      "sources" : [
        "SemanticVersion+Comparabl.swift",
        "SemanticVersion.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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 -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
[3/5] Compiling SemanticVersion SemanticVersion.swift
/host/spi-builder-workspace/Sources/SemanticVersion/SemanticVersion.swift:11:16: warning: static property 'unknown' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  9 |     public let patch: Int
 10 |
 11 |     static var unknown : SemanticVersion = SemanticVersion()
    |                |- warning: static property 'unknown' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: convert 'unknown' to a 'let' constant to make 'Sendable' shared state immutable
    |                |- note: add '@MainActor' to make static property 'unknown' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 12 |
 13 |     public var isUnknown : Bool { return major == 0 && minor == 0 && patch == 0 }
[4/5] Compiling SemanticVersion SemanticVersion+Comparabl.swift
[5/5] Emitting module SemanticVersion
/host/spi-builder-workspace/Sources/SemanticVersion/SemanticVersion.swift:11:16: warning: static property 'unknown' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  9 |     public let patch: Int
 10 |
 11 |     static var unknown : SemanticVersion = SemanticVersion()
    |                |- warning: static property 'unknown' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                |- note: convert 'unknown' to a 'let' constant to make 'Sendable' shared state immutable
    |                |- note: add '@MainActor' to make static property 'unknown' part of global actor 'MainActor'
    |                `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 12 |
 13 |     public var isUnknown : Bool { return major == 0 && minor == 0 && patch == 0 }
Build complete! (6.96s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SemanticVersion",
  "name" : "SemanticVersion",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "SemanticVersion",
      "targets" : [
        "SemanticVersion"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SemanticVersionTests",
      "module_type" : "SwiftTarget",
      "name" : "SemanticVersionTests",
      "path" : "Tests/SemanticVersionTests",
      "sources" : [
        "SemanticVersionTests.swift"
      ],
      "target_dependencies" : [
        "SemanticVersion"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SemanticVersion",
      "module_type" : "SwiftTarget",
      "name" : "SemanticVersion",
      "path" : "Sources/SemanticVersion",
      "product_memberships" : [
        "SemanticVersion"
      ],
      "sources" : [
        "SemanticVersion+Comparabl.swift",
        "SemanticVersion.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
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.