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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 macOS (SPM) on 27 Apr 2025 03:25:03 UTC.

Swift 6 data race errors: 1

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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

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 /Users/admin/builder/spi-builder-workspace/.git/
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
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "semanticversion",
      "name": "SemanticVersion",
      "url": "https://github.com/elegantchaos/SemanticVersion.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/SemanticVersion",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/elegantchaos/SemanticVersion.git
[4/152] Fetching semanticversion
Fetched https://github.com/elegantchaos/SemanticVersion.git from cache (0.63s)
Creating working copy for https://github.com/elegantchaos/SemanticVersion.git
Working copy of https://github.com/elegantchaos/SemanticVersion.git resolved at main (2637309)
warning: '.resolve-product-dependencies': dependency 'semanticversion' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/elegantchaos/SemanticVersion.git
https://github.com/elegantchaos/SemanticVersion.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SemanticVersion",
  "name" : "SemanticVersion",
  "path" : "/Users/admin/builder/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 ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/5] Compiling SemanticVersion SemanticVersion.swift
/Users/admin/builder/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] Emitting module SemanticVersion
/Users/admin/builder/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 }
[5/5] Compiling SemanticVersion SemanticVersion+Comparabl.swift
Build complete! (4.37s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SemanticVersion",
  "name" : "SemanticVersion",
  "path" : "/Users/admin/builder/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"
}
Done.