The Swift Package Index logo.Swift Package Index

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 master (b5fd7f), with Swift 6.1 for Linux on 25 Apr 2025 21:01:01 UTC.

Swift 6 data race errors: 5

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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/luoxiu/Once.git
Reference: master
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/luoxiu/Once
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
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 master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/luoxiu/Once.git
https://github.com/luoxiu/Once.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Once",
  "name" : "Once",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Once",
      "targets" : [
        "Once"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "OnceTests",
      "module_type" : "SwiftTarget",
      "name" : "OnceTests",
      "path" : "Tests/OnceTests",
      "sources" : [
        "PersistentTokenTests.swift",
        "TimesPredicateTests.swift",
        "TokenTests.swift",
        "Utils.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Once"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Once",
      "module_type" : "SwiftTarget",
      "name" : "Once",
      "path" : "Sources/Once",
      "product_memberships" : [
        "Once"
      ],
      "sources" : [
        "Atom.swift",
        "Lock.swift",
        "PersistentToken.swift",
        "Scope.swift",
        "TimesPredicate.swift",
        "Token.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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
[3/9] Emitting module Once
/host/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: add '@MainActor' to make static property 'registry' part of global actor 'MainActor'
    |                        `- 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 |
/host/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
/host/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: add '@MainActor' to make static property 'isInitialized' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 15 |
 16 |     private static var sessionStartDate = Date()
/host/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
/host/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: add '@MainActor' to make static property 'sessionStartDate' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |     private static var versionUpdateDate: Date?
 18 |
/host/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: add '@MainActor' to make static property 'versionUpdateDate' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 18 |
 19 |     public let name: String
/host/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: add '@MainActor' to make static property 'registry' part of global actor 'MainActor'
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
28 |
29 |     public static func makeStatic(
/host/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
[4/9] Compiling Once Lock.swift
[5/9] Compiling Once TimesPredicate.swift
[6/9] Compiling Once PersistentToken.swift
/host/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: add '@MainActor' to make static property 'registry' part of global actor 'MainActor'
    |                        `- 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 |
/host/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
/host/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: add '@MainActor' to make static property 'isInitialized' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 15 |
 16 |     private static var sessionStartDate = Date()
/host/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
/host/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: add '@MainActor' to make static property 'sessionStartDate' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 17 |     private static var versionUpdateDate: Date?
 18 |
/host/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: add '@MainActor' to make static property 'versionUpdateDate' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 18 |
 19 |     public let name: String
[7/9] Compiling Once Scope.swift
[8/9] Compiling Once Token.swift
/host/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: add '@MainActor' to make static property 'registry' part of global actor 'MainActor'
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
28 |
29 |     public static func makeStatic(
/host/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 Atom.swift
Build complete! (6.81s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Once",
  "name" : "Once",
  "path" : "/host/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"
}
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.