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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 Once, reference 1.0.0 (b5fd7f), with Swift 6.0 for macOS (SPM) on 1 Nov 2024 02:09:07 UTC.

Swift 6 data race errors: 5

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.56.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/luoxiu/Once.git
Reference: 1.0.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/luoxiu/Once
 * tag               1.0.0      -> FETCH_HEAD
HEAD is now at b5fd7f6 fix badge
Cloned https://github.com/luoxiu/Once.git
Revision (git rev-parse @):
b5fd7f667344b691db55eba2ab9c7709fa4c5d96
SUCCESS checkout https://github.com/luoxiu/Once.git at 1.0.0
========================================
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": "once",
      "name": "Once",
      "url": "https://github.com/luoxiu/Once.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Once",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/luoxiu/Once.git
[1/210] Fetching once
Fetched https://github.com/luoxiu/Once.git from cache (0.68s)
Creating working copy for https://github.com/luoxiu/Once.git
Working copy of https://github.com/luoxiu/Once.git resolved at 1.0.0 (b5fd7f6)
warning: '.resolve-product-dependencies': dependency 'once' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/luoxiu/Once.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--7754E27361AE5C74.txt
[3/9] Compiling Once TimesPredicate.swift
[4/9] Compiling Once Atom.swift
[5/9] Compiling Once Lock.swift
[6/9] Compiling Once Scope.swift
[7/9] Compiling Once Token.swift
/Users/admin/builder/spi-builder-workspace/Sources/Once/Token.swift:27:24: warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : Token]>' may have shared mutable state; this is an error in the Swift 6 language mode
25 | extension Token {
26 |
27 |     private static let registry = Atom<[String: Token]>(value: [:])
   |                        |- warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : Token]>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                        |- note: annotate 'registry' with '@MainActor' if property should only be accessed from the main actor
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
28 |
29 |     public static func makeStatic(
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
[8/9] Emitting module Once
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:13:24: warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : PersistentToken]>' may have shared mutable state; this is an error in the Swift 6 language mode
 11 |     }
 12 |
 13 |     private static let registry = Atom<[String: PersistentToken]>(value: [:])
    |                        |- warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : PersistentToken]>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: annotate 'registry' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
 15 |
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:14:24: warning: static property 'isInitialized' is not concurrency-safe because non-'Sendable' type 'Atom<Bool>' may have shared mutable state; this is an error in the Swift 6 language mode
 12 |
 13 |     private static let registry = Atom<[String: PersistentToken]>(value: [:])
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
    |                        |- warning: static property 'isInitialized' is not concurrency-safe because non-'Sendable' type 'Atom<Bool>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: annotate 'isInitialized' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 15 |
 16 |     private static var sessionStartDate = Date()
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:16:24: warning: static property 'sessionStartDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
 15 |
 16 |     private static var sessionStartDate = Date()
    |                        |- warning: static property 'sessionStartDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert 'sessionStartDate' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate 'sessionStartDate' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |     private static var versionUpdateDate: Date?
 18 |
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:17:24: warning: static property 'versionUpdateDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 15 |
 16 |     private static var sessionStartDate = Date()
 17 |     private static var versionUpdateDate: Date?
    |                        |- warning: static property 'versionUpdateDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert 'versionUpdateDate' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate 'versionUpdateDate' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 18 |
 19 |     public let name: String
/Users/admin/builder/spi-builder-workspace/Sources/Once/Token.swift:27:24: warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : Token]>' may have shared mutable state; this is an error in the Swift 6 language mode
25 | extension Token {
26 |
27 |     private static let registry = Atom<[String: Token]>(value: [:])
   |                        |- warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : Token]>' may have shared mutable state; this is an error in the Swift 6 language mode
   |                        |- note: annotate 'registry' with '@MainActor' if property should only be accessed from the main actor
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
28 |
29 |     public static func makeStatic(
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
[9/9] Compiling Once PersistentToken.swift
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:13:24: warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : PersistentToken]>' may have shared mutable state; this is an error in the Swift 6 language mode
 11 |     }
 12 |
 13 |     private static let registry = Atom<[String: PersistentToken]>(value: [:])
    |                        |- warning: static property 'registry' is not concurrency-safe because non-'Sendable' type 'Atom<[String : PersistentToken]>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: annotate 'registry' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
 15 |
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:14:24: warning: static property 'isInitialized' is not concurrency-safe because non-'Sendable' type 'Atom<Bool>' may have shared mutable state; this is an error in the Swift 6 language mode
 12 |
 13 |     private static let registry = Atom<[String: PersistentToken]>(value: [:])
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
    |                        |- warning: static property 'isInitialized' is not concurrency-safe because non-'Sendable' type 'Atom<Bool>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: annotate 'isInitialized' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 15 |
 16 |     private static var sessionStartDate = Date()
/Users/admin/builder/spi-builder-workspace/Sources/Once/Atom.swift:3:13: note: generic class 'Atom' does not conform to the 'Sendable' protocol
  1 | import Foundation
  2 |
  3 | final class Atom<Value> {
    |             `- note: generic class 'Atom' does not conform to the 'Sendable' protocol
  4 |
  5 |     private let lock: NSLocking
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:16:24: warning: static property 'sessionStartDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 14 |     private static let isInitialized = Atom(value: false, lock: DispatchSemaphoreLock())
 15 |
 16 |     private static var sessionStartDate = Date()
    |                        |- warning: static property 'sessionStartDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert 'sessionStartDate' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate 'sessionStartDate' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |     private static var versionUpdateDate: Date?
 18 |
/Users/admin/builder/spi-builder-workspace/Sources/Once/PersistentToken.swift:17:24: warning: static property 'versionUpdateDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 15 |
 16 |     private static var sessionStartDate = Date()
 17 |     private static var versionUpdateDate: Date?
    |                        |- warning: static property 'versionUpdateDate' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: convert 'versionUpdateDate' to a 'let' constant to make 'Sendable' shared state immutable
    |                        |- note: annotate 'versionUpdateDate' with '@MainActor' if property should only be accessed from the main actor
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 18 |
 19 |     public let name: String
Build complete! (7.88s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Once",
  "name" : "Once",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Once",
      "targets" : [
        "Once"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "OnceTests",
      "module_type" : "SwiftTarget",
      "name" : "OnceTests",
      "path" : "Tests/OnceTests",
      "sources" : [
        "PersistentTokenTests.swift",
        "TimesPredicateTests.swift",
        "TokenTests.swift",
        "Utils.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Once"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Once",
      "module_type" : "SwiftTarget",
      "name" : "Once",
      "path" : "Sources/Once",
      "product_memberships" : [
        "Once"
      ],
      "sources" : [
        "Atom.swift",
        "Lock.swift",
        "PersistentToken.swift",
        "Scope.swift",
        "TimesPredicate.swift",
        "Token.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Done.