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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 plural-kit, reference main (0bbac9), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 08:48:36 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/binarybirds/plural-kit.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/binarybirds/plural-kit
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 0bbac9a initial
Cloned https://github.com/binarybirds/plural-kit.git
Revision (git rev-parse @):
0bbac9a39a1a89187aebb8684420ca3f10036770
SUCCESS checkout https://github.com/binarybirds/plural-kit.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": "plural-kit",
      "name": "plural-kit",
      "url": "https://github.com/binarybirds/plural-kit.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/plural-kit",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/binarybirds/plural-kit.git
[1/17] Fetching plural-kit
Fetched https://github.com/binarybirds/plural-kit.git from cache (0.59s)
Creating working copy for https://github.com/binarybirds/plural-kit.git
Working copy of https://github.com/binarybirds/plural-kit.git resolved at main (0bbac9a)
warning: '.resolve-product-dependencies': dependency 'plural-kit' 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/binarybirds/plural-kit.git
https://github.com/binarybirds/plural-kit.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "plural-kit",
  "name" : "plural-kit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "PluralKit",
      "targets" : [
        "PluralKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PluralKitTests",
      "module_type" : "SwiftTarget",
      "name" : "PluralKitTests",
      "path" : "Tests/PluralKitTests",
      "sources" : [
        "PluralKitTests.swift"
      ],
      "target_dependencies" : [
        "PluralKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "PluralKit",
      "module_type" : "SwiftTarget",
      "name" : "PluralKit",
      "path" : "Sources/PluralKit",
      "product_memberships" : [
        "PluralKit"
      ],
      "sources" : [
        "PluralKit.swift",
        "String+Plural.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
[3/5] Emitting module PluralKit
/Users/admin/builder/spi-builder-workspace/Sources/PluralKit/PluralKit.swift:8:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'PluralKit' may have shared mutable state; this is an error in the Swift 6 language mode
  1 | import Foundation
  2 |
  3 | public final class PluralKit {
    |                    `- note: class 'PluralKit' does not conform to the 'Sendable' protocol
  4 |
  5 |     private var uncountables: [String] = []
  6 |     private var rules: [(rule: String, template: String)] = []
  7 |
  8 |     public static let shared: PluralKit = PluralKit()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'PluralKit' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  9 |
 10 |     public init() {
[4/5] Compiling PluralKit String+Plural.swift
[5/5] Compiling PluralKit PluralKit.swift
/Users/admin/builder/spi-builder-workspace/Sources/PluralKit/PluralKit.swift:8:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'PluralKit' may have shared mutable state; this is an error in the Swift 6 language mode
  1 | import Foundation
  2 |
  3 | public final class PluralKit {
    |                    `- note: class 'PluralKit' does not conform to the 'Sendable' protocol
  4 |
  5 |     private var uncountables: [String] = []
  6 |     private var rules: [(rule: String, template: String)] = []
  7 |
  8 |     public static let shared: PluralKit = PluralKit()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'PluralKit' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  9 |
 10 |     public init() {
Build complete! (3.92s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "plural-kit",
  "name" : "plural-kit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "PluralKit",
      "targets" : [
        "PluralKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PluralKitTests",
      "module_type" : "SwiftTarget",
      "name" : "PluralKitTests",
      "path" : "Tests/PluralKitTests",
      "sources" : [
        "PluralKitTests.swift"
      ],
      "target_dependencies" : [
        "PluralKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "PluralKit",
      "module_type" : "SwiftTarget",
      "name" : "PluralKit",
      "path" : "Sources/PluralKit",
      "product_memberships" : [
        "PluralKit"
      ],
      "sources" : [
        "PluralKit.swift",
        "String+Plural.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.3"
}
Done.