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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 Schedule, reference 2.1.1 (e388fc), with Swift 6.1 for Linux on 26 Apr 2025 03:45:55 UTC.

Swift 6 data race errors: 2

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/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/Schedule.git
Reference: 2.1.1
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/Schedule
 * tag               2.1.1      -> FETCH_HEAD
HEAD is now at e388fca Merge branch 'master' of https://github.com/luoxiu/Schedule
Cloned https://github.com/luoxiu/Schedule.git
Revision (git rev-parse @):
e388fcab1d870f32c0359a414fda81b8e81b98c9
SUCCESS checkout https://github.com/luoxiu/Schedule.git at 2.1.1
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/luoxiu/Schedule.git
https://github.com/luoxiu/Schedule.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Schedule",
  "name" : "Schedule",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.11"
    },
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "Schedule",
      "targets" : [
        "Schedule"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "ScheduleTests",
      "module_type" : "SwiftTarget",
      "name" : "ScheduleTests",
      "path" : "Tests/ScheduleTests",
      "sources" : [
        "AtomicTests.swift",
        "BagTests.swift",
        "ExtensionsTests.swift",
        "Helpers.swift",
        "IntervalTests.swift",
        "MonthdayTests.swift",
        "PeriodTests.swift",
        "PlanTests.swift",
        "TaskCenterTests.swift",
        "TaskTests.swift",
        "TimeTests.swift",
        "WeekdayTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Schedule"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Schedule",
      "module_type" : "SwiftTarget",
      "name" : "Schedule",
      "path" : "Sources/Schedule",
      "product_memberships" : [
        "Schedule"
      ],
      "sources" : [
        "Atomic.swift",
        "Bag.swift",
        "Extensions.swift",
        "Interval.swift",
        "Monthday.swift",
        "Period.swift",
        "Plan.swift",
        "RunLoopTask.swift",
        "Task.swift",
        "TaskCenter.swift",
        "Time.swift",
        "Weekday.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/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
[3/14] Compiling Schedule Time.swift
[4/15] Emitting module Schedule
/host/spi-builder-workspace/Sources/Schedule/Period.swift:45:24: warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
 43 |     }
 44 |
 45 |     private static let quantifiers: Atomic<[String: Int]> = Atomic([
    |                        |- warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: add '@MainActor' to make static property 'quantifiers' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 46 |         "one": 1, "two": 2, "three": 3, "four": 4, "five": 5, "six": 6,
 47 |         "seven": 7, "eight": 8, "nine": 9, "ten": 10, "eleven": 11, "twelve": 12
/host/spi-builder-workspace/Sources/Schedule/Atomic.swift:4:13: note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 2 |
 3 | /// An atomic box that can read and write the underlying value atomically.
 4 | final class Atomic<T> {
   |             `- note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 5 |
 6 |     private var val: T
/host/spi-builder-workspace/Sources/Schedule/TaskCenter.swift:28:13: warning: let '_default' is not concurrency-safe because non-'Sendable' type 'TaskCenter' may have shared mutable state; this is an error in the Swift 6 language mode
 26 | }
 27 |
 28 | private let _default = TaskCenter()
    |             |- warning: let '_default' is not concurrency-safe because non-'Sendable' type 'TaskCenter' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make let '_default' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 29 |
 30 | /// A task center that enables batch operation.
 31 | open class TaskCenter {
    |            `- note: class 'TaskCenter' does not conform to the 'Sendable' protocol
 32 |
 33 |     private let lock = NSLock()
[5/15] Compiling Schedule Extensions.swift
[6/15] Compiling Schedule Interval.swift
[7/15] Compiling Schedule Atomic.swift
[8/15] Compiling Schedule Bag.swift
[9/15] Compiling Schedule TaskCenter.swift
/host/spi-builder-workspace/Sources/Schedule/TaskCenter.swift:28:13: warning: let '_default' is not concurrency-safe because non-'Sendable' type 'TaskCenter' may have shared mutable state; this is an error in the Swift 6 language mode
 26 | }
 27 |
 28 | private let _default = TaskCenter()
    |             |- warning: let '_default' is not concurrency-safe because non-'Sendable' type 'TaskCenter' may have shared mutable state; this is an error in the Swift 6 language mode
    |             |- note: add '@MainActor' to make let '_default' part of global actor 'MainActor'
    |             `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 29 |
 30 | /// A task center that enables batch operation.
 31 | open class TaskCenter {
    |            `- note: class 'TaskCenter' does not conform to the 'Sendable' protocol
 32 |
 33 |     private let lock = NSLock()
[10/15] Compiling Schedule Monthday.swift
/host/spi-builder-workspace/Sources/Schedule/Period.swift:45:24: warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
 43 |     }
 44 |
 45 |     private static let quantifiers: Atomic<[String: Int]> = Atomic([
    |                        |- warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: add '@MainActor' to make static property 'quantifiers' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 46 |         "one": 1, "two": 2, "three": 3, "four": 4, "five": 5, "six": 6,
 47 |         "seven": 7, "eight": 8, "nine": 9, "ten": 10, "eleven": 11, "twelve": 12
/host/spi-builder-workspace/Sources/Schedule/Atomic.swift:4:13: note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 2 |
 3 | /// An atomic box that can read and write the underlying value atomically.
 4 | final class Atomic<T> {
   |             `- note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 5 |
 6 |     private var val: T
[11/15] Compiling Schedule Period.swift
/host/spi-builder-workspace/Sources/Schedule/Period.swift:45:24: warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
 43 |     }
 44 |
 45 |     private static let quantifiers: Atomic<[String: Int]> = Atomic([
    |                        |- warning: static property 'quantifiers' is not concurrency-safe because non-'Sendable' type 'Atomic<[String : Int]>' may have shared mutable state; this is an error in the Swift 6 language mode
    |                        |- note: add '@MainActor' to make static property 'quantifiers' part of global actor 'MainActor'
    |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 46 |         "one": 1, "two": 2, "three": 3, "four": 4, "five": 5, "six": 6,
 47 |         "seven": 7, "eight": 8, "nine": 9, "ten": 10, "eleven": 11, "twelve": 12
/host/spi-builder-workspace/Sources/Schedule/Atomic.swift:4:13: note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 2 |
 3 | /// An atomic box that can read and write the underlying value atomically.
 4 | final class Atomic<T> {
   |             `- note: generic class 'Atomic' does not conform to the 'Sendable' protocol
 5 |
 6 |     private var val: T
[12/15] Compiling Schedule Task.swift
[13/15] Compiling Schedule Plan.swift
/host/spi-builder-workspace/Sources/Schedule/RunLoopTask.swift:72:30: warning: capture of 'self' with non-sendable type 'RunLoopTask?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
46 | }
47 |
48 | private final class RunLoopTask: Task {
   |                     `- note: class 'RunLoopTask' does not conform to the 'Sendable' protocol
49 |
50 |     var timer: Timer!
   :
70 |
71 |         timer = Timer(fire: Date.distantFuture, interval: .greatestFiniteMagnitude, repeats: true) { [weak self] _ in
72 |             guard let self = self else { return }
   |                              `- warning: capture of 'self' with non-sendable type 'RunLoopTask?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
73 |             action(self)
74 |         }
/host/spi-builder-workspace/Sources/Schedule/RunLoopTask.swift:73:13: warning: capture of 'action' with non-sendable type '(Task) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
71 |         timer = Timer(fire: Date.distantFuture, interval: .greatestFiniteMagnitude, repeats: true) { [weak self] _ in
72 |             guard let self = self else { return }
73 |             action(self)
   |             |- warning: capture of 'action' with non-sendable type '(Task) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
   |             `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
74 |         }
75 |
[14/15] Compiling Schedule RunLoopTask.swift
/host/spi-builder-workspace/Sources/Schedule/RunLoopTask.swift:72:30: warning: capture of 'self' with non-sendable type 'RunLoopTask?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
46 | }
47 |
48 | private final class RunLoopTask: Task {
   |                     `- note: class 'RunLoopTask' does not conform to the 'Sendable' protocol
49 |
50 |     var timer: Timer!
   :
70 |
71 |         timer = Timer(fire: Date.distantFuture, interval: .greatestFiniteMagnitude, repeats: true) { [weak self] _ in
72 |             guard let self = self else { return }
   |                              `- warning: capture of 'self' with non-sendable type 'RunLoopTask?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
73 |             action(self)
74 |         }
/host/spi-builder-workspace/Sources/Schedule/RunLoopTask.swift:73:13: warning: capture of 'action' with non-sendable type '(Task) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
71 |         timer = Timer(fire: Date.distantFuture, interval: .greatestFiniteMagnitude, repeats: true) { [weak self] _ in
72 |             guard let self = self else { return }
73 |             action(self)
   |             |- warning: capture of 'action' with non-sendable type '(Task) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
   |             `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
74 |         }
75 |
[15/15] Compiling Schedule Weekday.swift
Build complete! (7.04s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Schedule",
  "name" : "Schedule",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.11"
    },
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    }
  ],
  "products" : [
    {
      "name" : "Schedule",
      "targets" : [
        "Schedule"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "ScheduleTests",
      "module_type" : "SwiftTarget",
      "name" : "ScheduleTests",
      "path" : "Tests/ScheduleTests",
      "sources" : [
        "AtomicTests.swift",
        "BagTests.swift",
        "ExtensionsTests.swift",
        "Helpers.swift",
        "IntervalTests.swift",
        "MonthdayTests.swift",
        "PeriodTests.swift",
        "PlanTests.swift",
        "TaskCenterTests.swift",
        "TaskTests.swift",
        "TimeTests.swift",
        "WeekdayTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "Schedule"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Schedule",
      "module_type" : "SwiftTarget",
      "name" : "Schedule",
      "path" : "Sources/Schedule",
      "product_memberships" : [
        "Schedule"
      ],
      "sources" : [
        "Atomic.swift",
        "Bag.swift",
        "Extensions.swift",
        "Interval.swift",
        "Monthday.swift",
        "Period.swift",
        "Plan.swift",
        "RunLoopTask.swift",
        "Task.swift",
        "TaskCenter.swift",
        "Time.swift",
        "Weekday.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.