Swift Package Index

Build Information

Failed to build Watchdog, reference master (2df9ac), with Swift 6.4 for Linux on 17 Sep 2026 19:58:11 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344843-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:basic-6.4-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
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:             6.4
Building package at path:  $PWD
https://github.com/wojteklu/Watchdog.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344843-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:basic-6.4-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:c77fcce225e223ac0fafed844619173fc6de8d62dd560eeb28db3182af6a282b
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:basic-6.4-latest
Building for debugging...
[Planning deferred tasks]
error: SwiftCompile normal x86_64 failed with a nonzero exit code. Command line:     cd /host

[21 / 29] 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 6.4.2) 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 6.4.2) because it has overridable members that could not be loaded in Swift 4.2
40 |     fileprivate var pingTaskIsRunning: Bool {
41 |         get {
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Classes/Watchdog.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -I /host/spi-builder-workspace/.build/out/Products/Debug-linux-x86_64 -module-cache-path /host/spi-builder-workspace/.build/out/ModuleCache.noindex -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -swift-version 4.2 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -external-plugin-path /usr/lib/swift/host/plugins/testing\#/usr/bin/swift-plugin-server -validate-clang-modules-once -clang-build-session-file /host/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /host -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -fno-omit-frame-pointer -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/host/spi-builder-workspace/.build/out/Products/Debug-linux-x86_64/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/DerivedSources-normal/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/DerivedSources/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name Watchdog -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Watchdog_const_extract_protocols.json -in-process-plugin-server-path /usr/lib/swift/host/libSwiftInProcPluginServer.so -plugin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -emit-module-doc-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Modules/Watchdog.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Modules/Watchdog.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Watchdog-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Watchdog-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Watchdog-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/Watchdog.build/Debug-linux-x86_64/Watchdog-t.build/Objects-normal/x86_64/Modules/Watchdog.swiftmodule
error: Build failed
BUILD FAILURE 6.4 linux