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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 GenericColor, reference 3.1.0 (c67323), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 05:47:29 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: 3.1.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/capturecontext/swift-generic-color
 * tag               3.1.0      -> FETCH_HEAD
HEAD is now at c67323d Update
Cloned https://github.com/capturecontext/swift-generic-color.git
Revision (git rev-parse @):
c67323d37bf474d8b1613b55a0e6dfbec05c65aa
SUCCESS checkout https://github.com/capturecontext/swift-generic-color.git at 3.1.0
========================================
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": "GenericColor",
      "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 (0.72s)
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 3.1.0 (c67323d)
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" : "GenericColor",
  "name" : "GenericColor",
  "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",
        "XCTestManifests.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",
        "KeyPathBuildable.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" : "5.1"
}
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
[3/21] Compiling GenericColor RGBAInitializable.swift
[4/21] Compiling GenericColor String+RGB.swift
[5/22] Compiling GenericColor StaticallyNamedType.swift
[6/22] Compiling GenericColor RGB+Conversions.swift
[7/22] Compiling GenericColor Decimal+Extension.swift
[8/22] Compiling GenericColor iOS.swift
[9/22] Compiling GenericColor RGB.swift
[10/22] Compiling GenericColor ConversionInitProtocols.swift
[11/22] Compiling GenericColor HSB+Conversions.swift
[12/22] Compiling GenericColor HSB.swift
[13/22] Compiling GenericColor KeyPathBuildable.swift
[14/22] Compiling GenericColor ColorSpace.swift
[15/22] Compiling GenericColor CMYK+Conversions.swift
[16/22] Compiling GenericColor Color.swift
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:23: 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
[17/22] Compiling GenericColor ColorComponent.swift
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:23: 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
[18/22] Emitting module GenericColor
/Users/admin/builder/spi-builder-workspace/Sources/GenericColor/ColorComponent.swift:12:23: 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
[19/22] Compiling GenericColor CMYK.swift
[20/22] Compiling GenericColor Color+Mapping.swift
[21/22] Compiling GenericColor OSX.swift
[22/22] Compiling GenericColor SwiftUI.swift
Build complete! (7.99s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "GenericColor",
  "name" : "GenericColor",
  "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",
        "XCTestManifests.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",
        "KeyPathBuildable.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" : "5.1"
}
Done.