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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 DockProgress, reference main (639ca6), with Swift 6.1 for macOS (SPM) on 28 Apr 2025 13:38:02 UTC.

Swift 6 data race errors: 2

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/sindresorhus/DockProgress.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/sindresorhus/DockProgress
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 639ca66 Fix version in readme
Cloned https://github.com/sindresorhus/DockProgress.git
Revision (git rev-parse @):
639ca66f19dda6f8bf73470f186447abb1a5a2a2
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/sindresorhus/DockProgress.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": "dockprogress",
      "name": "DockProgress",
      "url": "https://github.com/sindresorhus/DockProgress.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/DockProgress",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/sindresorhus/DockProgress.git
[8/720] Fetching dockprogress
Fetched https://github.com/sindresorhus/DockProgress.git from cache (1.19s)
Creating working copy for https://github.com/sindresorhus/DockProgress.git
Working copy of https://github.com/sindresorhus/DockProgress.git resolved at main (639ca66)
warning: '.resolve-product-dependencies': dependency 'dockprogress' 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/sindresorhus/DockProgress.git
https://github.com/sindresorhus/DockProgress.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DockProgress",
  "name" : "DockProgress",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "DockProgress",
      "targets" : [
        "DockProgress"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "DockProgress",
      "module_type" : "SwiftTarget",
      "name" : "DockProgress",
      "path" : "Sources/DockProgress",
      "product_memberships" : [
        "DockProgress"
      ],
      "sources" : [
        "DockProgress.swift",
        "Utilities.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
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 DockProgress DockProgress.swift
/Users/admin/builder/spi-builder-workspace/Sources/DockProgress/DockProgress.swift:24:5: warning: sending 'displayLinkObserver' risks causing data races; this is an error in the Swift 6 language mode
 22 | 				displayedProgress = progress
 23 | 				elapsedTimeSinceLastRefresh = 0
 24 | 				displayLinkObserver.stop()
    |     |- warning: sending 'displayLinkObserver' risks causing data races; this is an error in the Swift 6 language mode
    |     `- note: task-isolated 'displayLinkObserver' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
 25 | 			} else {
 26 | 				displayedProgress = Easing.linearInterpolation(
[4/5] Compiling DockProgress Utilities.swift
/Users/admin/builder/spi-builder-workspace/Sources/DockProgress/Utilities.swift:157:13: warning: static property 'helveticaNeueBold' is not concurrency-safe because non-'Sendable' type 'NSFont?' may have shared mutable state; this is an error in the Swift 6 language mode
155 |
156 | extension NSFont {
157 | 	static let helveticaNeueBold = NSFont(name: "HelveticaNeue-Bold", size: 0)
    |             |- warning: static property 'helveticaNeueBold' is not concurrency-safe because non-'Sendable' type 'NSFont?' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make static property 'helveticaNeueBold' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
158 | }
159 |
Swift.Optional:1:21: note: generic enum 'Optional' does not conform to the 'Sendable' protocol
1 | @frozen public enum Optional<Wrapped> : ~Copyable where Wrapped : ~Copyable {
  |                     `- note: generic enum 'Optional' does not conform to the 'Sendable' protocol
2 |     case none
3 |     case some(Wrapped)
[5/5] Emitting module DockProgress
/Users/admin/builder/spi-builder-workspace/Sources/DockProgress/Utilities.swift:157:13: warning: static property 'helveticaNeueBold' is not concurrency-safe because non-'Sendable' type 'NSFont?' may have shared mutable state; this is an error in the Swift 6 language mode
155 |
156 | extension NSFont {
157 | 	static let helveticaNeueBold = NSFont(name: "HelveticaNeue-Bold", size: 0)
    |             |- warning: static property 'helveticaNeueBold' is not concurrency-safe because non-'Sendable' type 'NSFont?' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make static property 'helveticaNeueBold' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
158 | }
159 |
Swift.Optional:1:21: note: generic enum 'Optional' does not conform to the 'Sendable' protocol
1 | @frozen public enum Optional<Wrapped> : ~Copyable where Wrapped : ~Copyable {
  |                     `- note: generic enum 'Optional' does not conform to the 'Sendable' protocol
2 |     case none
3 |     case some(Wrapped)
/Users/admin/builder/spi-builder-workspace/Sources/DockProgress/DockProgress.swift:24:5: warning: sending 'displayLinkObserver' risks causing data races; this is an error in the Swift 6 language mode
 22 | 				displayedProgress = progress
 23 | 				elapsedTimeSinceLastRefresh = 0
 24 | 				displayLinkObserver.stop()
    |     |- warning: sending 'displayLinkObserver' risks causing data races; this is an error in the Swift 6 language mode
    |     `- note: task-isolated 'displayLinkObserver' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
 25 | 			} else {
 26 | 				displayedProgress = Easing.linearInterpolation(
Build complete! (6.93s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DockProgress",
  "name" : "DockProgress",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "DockProgress",
      "targets" : [
        "DockProgress"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "DockProgress",
      "module_type" : "SwiftTarget",
      "name" : "DockProgress",
      "path" : "Sources/DockProgress",
      "product_memberships" : [
        "DockProgress"
      ],
      "sources" : [
        "DockProgress.swift",
        "Utilities.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
✅  Doc result (pending) reported
========================================
GenerateDocs
========================================
Generating docs at path:  $PWD/.docs/sindresorhus/dockprogress/main
Repository:               sindresorhus/DockProgress
Swift version used:       6.1
Target:                   DockProgress
Extracting symbol information for 'DockProgress'...
Finished extracting symbol information for 'DockProgress'. (4.58s)
Building documentation for 'DockProgress'...
Finished building documentation for 'DockProgress' (0.11s)
Generated documentation archive at:
  /Users/admin/builder/spi-builder-workspace/.docs/sindresorhus/dockprogress/main
Fetching https://github.com/swiftlang/swift-docc-plugin from cache
Fetched https://github.com/swiftlang/swift-docc-plugin from cache (0.43s)
Computing version for https://github.com/swiftlang/swift-docc-plugin
Computed https://github.com/swiftlang/swift-docc-plugin at 1.4.3 (1.11s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit from cache
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.78s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (1.38s)
Creating working copy for https://github.com/swiftlang/swift-docc-plugin
Working copy of https://github.com/swiftlang/swift-docc-plugin resolved at 1.4.3
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
Building for debugging...
[0/8] Write sources
[1/8] Write snippet-extract-tool-entitlement.plist
[2/8] Write sources
[4/8] Write swift-version-2F0A5646E1D333AE.txt
[6/53] Emitting module SymbolKit
[7/57] Compiling SymbolKit Names.swift
[8/57] Compiling SymbolKit SPI.swift
[9/57] Compiling SymbolKit Snippet.swift
[10/57] Compiling SymbolKit Extension.swift
[11/57] Compiling SymbolKit Identifier.swift
[12/57] Compiling SymbolKit KindIdentifier.swift
[13/57] Compiling SymbolKit Location.swift
[14/57] Compiling SymbolKit Mutability.swift
[15/57] Compiling SymbolKit GenericConstraint.swift
[16/57] Compiling SymbolKit GenericParameter.swift
[17/57] Compiling SymbolKit Generics.swift
[18/57] Compiling SymbolKit Namespace.swift
[19/57] Compiling SymbolKit SemanticVersion.swift
[20/57] Compiling SymbolKit AccessControl.swift
[21/57] Compiling SymbolKit Availability.swift
[22/57] Compiling SymbolKit AvailabilityItem.swift
[23/57] Compiling SymbolKit Domain.swift
[24/57] Compiling SymbolKit Symbol.swift
[25/57] Compiling SymbolKit SymbolKind.swift
[26/57] Compiling SymbolKit SymbolGraph.swift
[27/57] Compiling SymbolKit GraphCollector.swift
[28/57] Compiling SymbolKit Mixin+Equals.swift
[29/57] Compiling SymbolKit Mixin+Hash.swift
[30/57] Compiling SymbolKit Mixin.swift
[31/57] Compiling SymbolKit LineList.swift
[32/57] Compiling SymbolKit Position.swift
[33/57] Compiling SymbolKit DeclarationFragments.swift
[34/57] Compiling SymbolKit Fragment.swift
[35/57] Compiling SymbolKit FragmentKind.swift
[36/57] Compiling SymbolKit FunctionParameter.swift
[37/57] Compiling SymbolKit FunctionSignature.swift
[38/57] Compiling SymbolKit Relationship.swift
[39/57] Compiling SymbolKit RelationshipKind.swift
[40/57] Compiling SymbolKit SourceOrigin.swift
[41/57] Compiling SymbolKit GenericConstraints.swift
[42/57] Compiling SymbolKit Swift.swift
[43/57] Compiling SymbolKit SourceRange.swift
[44/57] Compiling SymbolKit Metadata.swift
[45/57] Compiling SymbolKit Module.swift
[46/57] Compiling SymbolKit OperatingSystem.swift
[47/57] Compiling SymbolKit Platform.swift
[48/57] Emitting module Snippets
[49/57] Compiling Snippets Snippet.swift
[50/57] Compiling Snippets SnippetParser.swift
[51/57] Compiling SymbolKit UnifiedSymbol+Encodable.swift
[52/57] Compiling SymbolKit UnifiedSymbol.swift
[53/57] Compiling SymbolKit UnifiedSymbolGraph+Encodable.swift
[54/57] Compiling SymbolKit UnifiedSymbolGraph.swift
[55/61] Compiling snippet_extract URL+Status.swift
[56/61] Compiling snippet_extract SymbolGraph+Snippet.swift
[57/61] Compiling snippet_extract SnippetBuildCommand.swift
[58/61] Emitting module snippet_extract
[58/61] Write Objects.LinkFileList
[59/61] Linking snippet-extract-tool
[60/61] Applying snippet-extract-tool
Build of product 'snippet-extract' complete! (4.82s)
Building for debugging...
[0/1] Write swift-version-2F0A5646E1D333AE.txt
[2/4] Compiling DockProgress Utilities.swift
[3/4] Emitting module DockProgress
[4/4] Compiling DockProgress DockProgress.swift
Build of target: 'DockProgress' complete! (0.74s)
      80
2	/Users/admin/builder/spi-builder-workspace/.docs/sindresorhus/dockprogress/main
✅  Doc result (uploading) reported
========================================
SyncDocs
========================================
Doc archive source directory: $PWD/.docs/sindresorhus/dockprogress/main
File count: 80
Doc size:   2.0MB
Preparing doc bundle ...
Uploading prod-sindresorhus-dockprogress-main-b241052e.zip to s3://spi-docs-inbox/prod-sindresorhus-dockprogress-main-b241052e.zip
Copying... [19%]
Copying... [37%]
Copying... [56%]
Copying... [75%]
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Copying... [100%]
Done.