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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 4.0.0-alpha.1.0 (574d54), with Swift 6.1 for Linux on 27 Apr 2025 05:40:47 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/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/capturecontext/swift-generic-color.git
Reference: 4.0.0-alpha.1.0
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/capturecontext/swift-generic-color
 * tag               4.0.0-alpha.1.0 -> FETCH_HEAD
HEAD is now at 574d54b Minor refactoring
Cloned https://github.com/capturecontext/swift-generic-color.git
Revision (git rev-parse @):
574d54b49c9ea705f69346c0a256beda952cbf26
SUCCESS checkout https://github.com/capturecontext/swift-generic-color.git at 4.0.0-alpha.1.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/capturecontext/swift-generic-color.git
https://github.com/capturecontext/swift-generic-color.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "GenericColor",
  "name" : "GenericColor",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "GenericColor",
      "targets" : [
        "GenericColor"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "GenericColorTests",
      "module_type" : "SwiftTarget",
      "name" : "GenericColorTests",
      "path" : "Tests/GenericColorTests",
      "sources" : [
        "GenericColorTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "GenericColor"
      ],
      "type" : "test"
    },
    {
      "c99name" : "GenericColor",
      "module_type" : "SwiftTarget",
      "name" : "GenericColor",
      "path" : "Sources/GenericColor",
      "product_memberships" : [
        "GenericColor"
      ],
      "sources" : [
        "CMYK/CMYK.swift",
        "Color+Mapping.swift",
        "Color.swift",
        "ColorComponent.swift",
        "ColorSpace.swift",
        "Conversions/CMYK+Conversions.swift",
        "Conversions/ConversionInitProtocols.swift",
        "Conversions/HSB+Conversions.swift",
        "Conversions/RGB+Conversions.swift",
        "Decimal+Extension.swift",
        "HSB/HSB.swift",
        "KeyPathBuildable.swift",
        "PlatformSpecific/OSX.swift",
        "PlatformSpecific/SwiftUI.swift",
        "PlatformSpecific/iOS.swift",
        "RGB/RGB.swift",
        "RGB/RGBAInitializable.swift",
        "RGB/String+RGB.swift",
        "StaticallyNamedType.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$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
[3/20] Emitting module GenericColor
/host/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
[4/22] Compiling GenericColor SwiftUI.swift
[5/22] Compiling GenericColor iOS.swift
[6/22] Compiling GenericColor KeyPathBuildable.swift
[7/22] Compiling GenericColor OSX.swift
[8/22] Compiling GenericColor CMYK.swift
[9/22] Compiling GenericColor Color+Mapping.swift
[10/22] Compiling GenericColor Color.swift
[11/22] Compiling GenericColor String+RGB.swift
[12/22] Compiling GenericColor StaticallyNamedType.swift
[13/22] Compiling GenericColor ColorComponent.swift
/host/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
[14/22] Compiling GenericColor ColorSpace.swift
/host/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
[15/22] Compiling GenericColor CMYK+Conversions.swift
/host/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
[16/22] Compiling GenericColor RGB.swift
[17/22] Compiling GenericColor RGBAInitializable.swift
[18/22] Compiling GenericColor Decimal+Extension.swift
[19/22] Compiling GenericColor HSB.swift
[20/22] Compiling GenericColor ConversionInitProtocols.swift
[21/22] Compiling GenericColor HSB+Conversions.swift
[22/22] Compiling GenericColor RGB+Conversions.swift
Build complete! (5.94s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "GenericColor",
  "name" : "GenericColor",
  "path" : "/host/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" : "5.3"
}
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.