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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 swift-generic-color, reference main (a4ce3f), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 05:49:23 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/capturecontext/swift-generic-color.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/capturecontext/swift-generic-color
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at a4ce3f8 Migration to capturecontext/swift-generic-color
Cloned https://github.com/capturecontext/swift-generic-color.git
Revision (git rev-parse @):
a4ce3f82b0f3ae604b1d2236cfefcf600fd59c41
SUCCESS checkout https://github.com/capturecontext/swift-generic-color.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": "swift-generic-color",
      "name": "swift-generic-color",
      "url": "https://github.com/capturecontext/swift-generic-color.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/swift-generic-color",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/capturecontext/swift-generic-color.git
[1/226] Fetching swift-generic-color
Fetched https://github.com/capturecontext/swift-generic-color.git from cache (0.67s)
Creating working copy for https://github.com/capturecontext/swift-generic-color.git
Working copy of https://github.com/capturecontext/swift-generic-color.git resolved at main (a4ce3f8)
warning: '.resolve-product-dependencies': dependency 'swift-generic-color' 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/capturecontext/swift-generic-color.git
https://github.com/capturecontext/swift-generic-color.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "swift-generic-color",
  "name" : "swift-generic-color",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "GenericColor",
      "targets" : [
        "GenericColor"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "GenericColorTests",
      "module_type" : "SwiftTarget",
      "name" : "GenericColorTests",
      "path" : "Tests/GenericColorTests",
      "sources" : [
        "GenericColorTests.swift"
      ],
      "target_dependencies" : [
        "GenericColor"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GenericColor",
      "module_type" : "SwiftTarget",
      "name" : "GenericColor",
      "path" : "Sources/GenericColor",
      "product_memberships" : [
        "GenericColor"
      ],
      "sources" : [
        "CMYK/CMYK.swift",
        "Color+Mapping.swift",
        "Color.swift",
        "ColorComponent.swift",
        "ColorSpace.swift",
        "Conversions/CMYK+Conversions.swift",
        "Conversions/ConversionInitProtocols.swift",
        "Conversions/HSB+Conversions.swift",
        "Conversions/RGB+Conversions.swift",
        "Decimal+Extension.swift",
        "HSB/HSB.swift",
        "PlatformSpecific/OSX.swift",
        "PlatformSpecific/SwiftUI.swift",
        "PlatformSpecific/iOS.swift",
        "RGB/RGB.swift",
        "RGB/RGBAInitializable.swift",
        "RGB/String+RGB.swift",
        "StaticallyNamedType.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
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
[3/20] Emitting module GenericColor
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:21: warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 10 |
 11 | public struct ColorComponent: Equatable, Comparable, Codable, AdditiveArithmetic {
 12 |   public static var zero: ColorComponent = .init(value: 0)
    |                     |- warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: convert 'zero' to a 'let' constant to make 'Sendable' shared state immutable
    |                     |- note: add '@MainActor' to make static property 'zero' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 13 |
 14 |   private static let _max: Decimal = 1
[4/20] Compiling GenericColor String+RGB.swift
[5/20] Compiling GenericColor ColorSpace.swift
[6/20] Compiling GenericColor CMYK+Conversions.swift
[7/20] Compiling GenericColor RGB+Conversions.swift
[8/20] Compiling GenericColor Decimal+Extension.swift
[9/20] Compiling GenericColor HSB.swift
[10/20] Compiling GenericColor OSX.swift
[11/20] Compiling GenericColor Color.swift
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:21: warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 10 |
 11 | public struct ColorComponent: Equatable, Comparable, Codable, AdditiveArithmetic {
 12 |   public static var zero: ColorComponent = .init(value: 0)
    |                     |- warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: convert 'zero' to a 'let' constant to make 'Sendable' shared state immutable
    |                     |- note: add '@MainActor' to make static property 'zero' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 13 |
 14 |   private static let _max: Decimal = 1
[12/20] Compiling GenericColor ColorComponent.swift
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:21: warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 10 |
 11 | public struct ColorComponent: Equatable, Comparable, Codable, AdditiveArithmetic {
 12 |   public static var zero: ColorComponent = .init(value: 0)
    |                     |- warning: static property 'zero' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                     |- note: convert 'zero' to a 'let' constant to make 'Sendable' shared state immutable
    |                     |- note: add '@MainActor' to make static property 'zero' part of global actor 'MainActor'
    |                     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 13 |
 14 |   private static let _max: Decimal = 1
[13/20] Compiling GenericColor SwiftUI.swift
[14/20] Compiling GenericColor iOS.swift
[15/20] Compiling GenericColor RGB.swift
[16/20] Compiling GenericColor RGBAInitializable.swift
[17/20] Compiling GenericColor CMYK.swift
[18/20] Compiling GenericColor Color+Mapping.swift
[19/20] Compiling GenericColor ConversionInitProtocols.swift
[20/20] Compiling GenericColor HSB+Conversions.swift
[21/21] Compiling GenericColor StaticallyNamedType.swift
Build complete! (7.55s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "swift-generic-color",
  "name" : "swift-generic-color",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "GenericColor",
      "targets" : [
        "GenericColor"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "GenericColorTests",
      "module_type" : "SwiftTarget",
      "name" : "GenericColorTests",
      "path" : "Tests/GenericColorTests",
      "sources" : [
        "GenericColorTests.swift"
      ],
      "target_dependencies" : [
        "GenericColor"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GenericColor",
      "module_type" : "SwiftTarget",
      "name" : "GenericColor",
      "path" : "Sources/GenericColor",
      "product_memberships" : [
        "GenericColor"
      ],
      "sources" : [
        "CMYK/CMYK.swift",
        "Color+Mapping.swift",
        "Color.swift",
        "ColorComponent.swift",
        "ColorSpace.swift",
        "Conversions/CMYK+Conversions.swift",
        "Conversions/ConversionInitProtocols.swift",
        "Conversions/HSB+Conversions.swift",
        "Conversions/RGB+Conversions.swift",
        "Decimal+Extension.swift",
        "HSB/HSB.swift",
        "PlatformSpecific/OSX.swift",
        "PlatformSpecific/SwiftUI.swift",
        "PlatformSpecific/iOS.swift",
        "RGB/RGB.swift",
        "RGB/RGBAInitializable.swift",
        "RGB/String+RGB.swift",
        "StaticallyNamedType.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
Done.