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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

Failed to build Watchdog, reference master (2df9ac), with Swift 6.1 for Linux on 26 Apr 2025 14:06:00 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/wojteklu/Watchdog.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/wojteklu/Watchdog
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 2df9acf Add support for SwiftPM (#51)
Cloned https://github.com/wojteklu/Watchdog.git
Revision (git rev-parse @):
2df9acf8472a1f1146fc0f41e37d3f424dba72d6
SUCCESS checkout https://github.com/wojteklu/Watchdog.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/wojteklu/Watchdog.git
https://github.com/wojteklu/Watchdog.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Watchdog",
  "name" : "Watchdog",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Watchdog",
      "targets" : [
        "Watchdog"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Watchdog",
      "module_type" : "SwiftTarget",
      "name" : "Watchdog",
      "path" : "Classes",
      "product_memberships" : [
        "Watchdog"
      ],
      "sources" : [
        "Watchdog.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$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
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/4] Emitting module Watchdog
/host/spi-builder-workspace/Classes/Watchdog.swift:7:6: error: Objective-C interoperability is disabled
 5 |     fileprivate let pingThread: PingThread
 6 |
 7 |     @objc public static let defaultThreshold = 0.4
   |      `- error: Objective-C interoperability is disabled
 8 |
 9 |     /// Convenience initializer that allows you to construct a `WatchDog` object with default behavior.
/host/spi-builder-workspace/Classes/Watchdog.swift:12:6: error: Objective-C interoperability is disabled
10 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
11 |     /// - parameter strictMode: boolean value that stops the execution whenever the threshold is reached.
12 |     @objc public convenience init(threshold: Double = Watchdog.defaultThreshold, strictMode: Bool = false) {
   |      `- error: Objective-C interoperability is disabled
13 |         let message = "👮 Main thread was blocked for " + String(format: "%.2f", threshold) + "s 👮"
14 |
/host/spi-builder-workspace/Classes/Watchdog.swift:27:6: error: Objective-C interoperability is disabled
25 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
26 |     /// - parameter watchdogFiredCallback: a callback that will be called when the the threshold is reached
27 |     @objc public init(threshold: Double = Watchdog.defaultThreshold, watchdogFiredCallback: @escaping () -> Void) {
   |      `- error: Objective-C interoperability is disabled
28 |         self.pingThread = PingThread(threshold: threshold, handler: watchdogFiredCallback)
29 |
/host/spi-builder-workspace/Classes/Watchdog.swift:39:21: error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
37 | }
38 |
39 | private final class PingThread: Thread {
   |                     `- error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
[4/4] Compiling Watchdog Watchdog.swift
/host/spi-builder-workspace/Classes/Watchdog.swift:7:6: error: Objective-C interoperability is disabled
 5 |     fileprivate let pingThread: PingThread
 6 |
 7 |     @objc public static let defaultThreshold = 0.4
   |      `- error: Objective-C interoperability is disabled
 8 |
 9 |     /// Convenience initializer that allows you to construct a `WatchDog` object with default behavior.
/host/spi-builder-workspace/Classes/Watchdog.swift:12:6: error: Objective-C interoperability is disabled
10 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
11 |     /// - parameter strictMode: boolean value that stops the execution whenever the threshold is reached.
12 |     @objc public convenience init(threshold: Double = Watchdog.defaultThreshold, strictMode: Bool = false) {
   |      `- error: Objective-C interoperability is disabled
13 |         let message = "👮 Main thread was blocked for " + String(format: "%.2f", threshold) + "s 👮"
14 |
/host/spi-builder-workspace/Classes/Watchdog.swift:27:6: error: Objective-C interoperability is disabled
25 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
26 |     /// - parameter watchdogFiredCallback: a callback that will be called when the the threshold is reached
27 |     @objc public init(threshold: Double = Watchdog.defaultThreshold, watchdogFiredCallback: @escaping () -> Void) {
   |      `- error: Objective-C interoperability is disabled
28 |         self.pingThread = PingThread(threshold: threshold, handler: watchdogFiredCallback)
29 |
/host/spi-builder-workspace/Classes/Watchdog.swift:39:21: error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
37 | }
38 |
39 | private final class PingThread: Thread {
   |                     `- error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
/host/spi-builder-workspace/Classes/Watchdog.swift:42:13: error: cannot find 'objc_sync_enter' in scope
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
42 |             objc_sync_enter(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_enter' in scope
43 |             let result = _pingTaskIsRunning;
44 |             objc_sync_exit(pingTaskIsRunningLock)
/host/spi-builder-workspace/Classes/Watchdog.swift:44:13: error: cannot find 'objc_sync_exit' in scope
42 |             objc_sync_enter(pingTaskIsRunningLock)
43 |             let result = _pingTaskIsRunning;
44 |             objc_sync_exit(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_exit' in scope
45 |             return result
46 |         }
/host/spi-builder-workspace/Classes/Watchdog.swift:48:13: error: cannot find 'objc_sync_enter' in scope
46 |         }
47 |         set {
48 |             objc_sync_enter(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_enter' in scope
49 |             _pingTaskIsRunning = newValue
50 |             objc_sync_exit(pingTaskIsRunningLock)
/host/spi-builder-workspace/Classes/Watchdog.swift:50:13: error: cannot find 'objc_sync_exit' in scope
48 |             objc_sync_enter(pingTaskIsRunningLock)
49 |             _pingTaskIsRunning = newValue
50 |             objc_sync_exit(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_exit' in scope
51 |         }
52 |     }
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 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
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/3] Emitting module Watchdog
/host/spi-builder-workspace/Classes/Watchdog.swift:7:6: error: Objective-C interoperability is disabled
 5 |     fileprivate let pingThread: PingThread
 6 |
 7 |     @objc public static let defaultThreshold = 0.4
   |      `- error: Objective-C interoperability is disabled
 8 |
 9 |     /// Convenience initializer that allows you to construct a `WatchDog` object with default behavior.
/host/spi-builder-workspace/Classes/Watchdog.swift:12:6: error: Objective-C interoperability is disabled
10 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
11 |     /// - parameter strictMode: boolean value that stops the execution whenever the threshold is reached.
12 |     @objc public convenience init(threshold: Double = Watchdog.defaultThreshold, strictMode: Bool = false) {
   |      `- error: Objective-C interoperability is disabled
13 |         let message = "👮 Main thread was blocked for " + String(format: "%.2f", threshold) + "s 👮"
14 |
/host/spi-builder-workspace/Classes/Watchdog.swift:27:6: error: Objective-C interoperability is disabled
25 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
26 |     /// - parameter watchdogFiredCallback: a callback that will be called when the the threshold is reached
27 |     @objc public init(threshold: Double = Watchdog.defaultThreshold, watchdogFiredCallback: @escaping () -> Void) {
   |      `- error: Objective-C interoperability is disabled
28 |         self.pingThread = PingThread(threshold: threshold, handler: watchdogFiredCallback)
29 |
/host/spi-builder-workspace/Classes/Watchdog.swift:39:21: error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
37 | }
38 |
39 | private final class PingThread: Thread {
   |                     `- error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
[3/3] Compiling Watchdog Watchdog.swift
/host/spi-builder-workspace/Classes/Watchdog.swift:7:6: error: Objective-C interoperability is disabled
 5 |     fileprivate let pingThread: PingThread
 6 |
 7 |     @objc public static let defaultThreshold = 0.4
   |      `- error: Objective-C interoperability is disabled
 8 |
 9 |     /// Convenience initializer that allows you to construct a `WatchDog` object with default behavior.
/host/spi-builder-workspace/Classes/Watchdog.swift:12:6: error: Objective-C interoperability is disabled
10 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
11 |     /// - parameter strictMode: boolean value that stops the execution whenever the threshold is reached.
12 |     @objc public convenience init(threshold: Double = Watchdog.defaultThreshold, strictMode: Bool = false) {
   |      `- error: Objective-C interoperability is disabled
13 |         let message = "👮 Main thread was blocked for " + String(format: "%.2f", threshold) + "s 👮"
14 |
/host/spi-builder-workspace/Classes/Watchdog.swift:27:6: error: Objective-C interoperability is disabled
25 |     /// - parameter threshold: number of seconds that must pass to consider the main thread blocked.
26 |     /// - parameter watchdogFiredCallback: a callback that will be called when the the threshold is reached
27 |     @objc public init(threshold: Double = Watchdog.defaultThreshold, watchdogFiredCallback: @escaping () -> Void) {
   |      `- error: Objective-C interoperability is disabled
28 |         self.pingThread = PingThread(threshold: threshold, handler: watchdogFiredCallback)
29 |
/host/spi-builder-workspace/Classes/Watchdog.swift:39:21: error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
37 | }
38 |
39 | private final class PingThread: Thread {
   |                     `- error: cannot inherit from class 'Thread' (compiled with Swift 6.1) because it has overridable members that could not be loaded in Swift 4.2
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
/host/spi-builder-workspace/Classes/Watchdog.swift:42:13: error: cannot find 'objc_sync_enter' in scope
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
42 |             objc_sync_enter(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_enter' in scope
43 |             let result = _pingTaskIsRunning;
44 |             objc_sync_exit(pingTaskIsRunningLock)
/host/spi-builder-workspace/Classes/Watchdog.swift:44:13: error: cannot find 'objc_sync_exit' in scope
42 |             objc_sync_enter(pingTaskIsRunningLock)
43 |             let result = _pingTaskIsRunning;
44 |             objc_sync_exit(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_exit' in scope
45 |             return result
46 |         }
/host/spi-builder-workspace/Classes/Watchdog.swift:48:13: error: cannot find 'objc_sync_enter' in scope
46 |         }
47 |         set {
48 |             objc_sync_enter(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_enter' in scope
49 |             _pingTaskIsRunning = newValue
50 |             objc_sync_exit(pingTaskIsRunningLock)
/host/spi-builder-workspace/Classes/Watchdog.swift:50:13: error: cannot find 'objc_sync_exit' in scope
48 |             objc_sync_enter(pingTaskIsRunningLock)
49 |             _pingTaskIsRunning = newValue
50 |             objc_sync_exit(pingTaskIsRunningLock)
   |             `- error: cannot find 'objc_sync_exit' in scope
51 |         }
52 |     }
BUILD FAILURE 6.1 linux