MQTTKit – Build Information – Swift Package Index

Build Information

Failed to build MQTTKit, reference master (ec8946), with Swift 6.4 for Wasm on 16 Sep 2026 10:42:21 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:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/arnecs/mqttkit.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/arnecs/mqttkit
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at ec89464 travis script xcodebuild
Cloned https://github.com/arnecs/mqttkit.git
Revision (git rev-parse @):
ec894640f1ea27f758b3f4d22722d83159773cd0
SUCCESS checkout https://github.com/arnecs/mqttkit.git at master
========================================
Build
========================================
Selected platform:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/arnecs/mqttkit.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344843-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1
wasm-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:4328fdb43c680d205c1d6761b1e3267aa38277eefdda9ddfb17b6a0f1a77857a
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest
Building for debugging...
[Planning deferred tasks]
error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line:     cd /host

/host/spi-builder-workspace/Sources/Constants.swift:45:5: [1;33mwarning: [1;39m'public' modifier is redundant for operator function declared in a public extension[0;0m
 [0;36m43 |[0;0m
 [0;36m44 |[0;0m public extension MQTTQoSLevel {
 [0;36m45 |[0;0m     public static func < (lhs: MQTTQoSLevel, rhs: MQTTQoSLevel) -> Bool {
    [0;36m|[0;0m     `- [1;33mwarning: [1;39m'public' modifier is redundant for operator function declared in a public extension[0;0m
 [0;36m46 |[0;0m         return lhs.rawValue < rhs.rawValue
 [0;36m47 |[0;0m     }
/host/spi-builder-workspace/Sources/MQTTOptions.swift:32:23: [1;31merror: [1;39mcannot find type 'DispatchQoS' in scope[0;0m
[0;36m30 |[0;0m     var autoReconnectTimeout: Double = 60
[0;36m31 |[0;0m     var bufferSize: Int = 4096
[0;36m32 |[0;0m     var readQosClass: [4;39mDispatchQoS[0;0m.QoSClass = .background
   [0;36m|[0;0m                       `- [1;31merror: [1;39mcannot find type 'DispatchQoS' in scope[0;0m
[0;36m33 |[0;0m
[0;36m34 |[0;0m     init(host: String, port: Int? = nil) {
/host/spi-builder-workspace/Sources/MQTTSession.swift:16:30: [1;31merror: [1;39mcannot find 'DispatchQueue' in scope[0;0m
 [0;36m14 |[0;0m     private var outputStream: OutputStream?
 [0;36m15 |[0;0m     private lazy var lastServerResponse: Date = Date()
 [0;36m16 |[0;0m     private var writeQueue = [4;39mDispatchQueue[0;0m(label: "mqtt_write")
    [0;36m|[0;0m                              `- [1;31merror: [1;39mcannot find 'DispatchQueue' in scope[0;0m
 [0;36m17 |[0;0m     private var messageId: UInt16 = 0
 [0;36m18 |[0;0m     private var pendingPackets: [UInt16: MQTTPacket] = [:]
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Sources/Constants.swift /host/spi-builder-workspace/Sources/Extensions.swift /host/spi-builder-workspace/Sources/MQTTMessage.swift /host/spi-builder-workspace/Sources/MQTTOptions.swift /host/spi-builder-workspace/Sources/MQTTPacket.swift /host/spi-builder-workspace/Sources/MQTTSession.swift /host/spi-builder-workspace/Sources/MQTTSessionDelegate.swift -target wasm32-unknown-wasip1 -disable-objc-interop -sdk /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -sysroot /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -I /host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32 -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 -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 -resource-dir /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static -use-static-resource-dir -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -resource-dir -Xcc /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static/clang -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-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name MQTTKit -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/MQTTKit_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/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-[26 / 34] MQTTKit
normal/wasm32/Modules/MQTTKit.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/Modules/MQTTKit.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/MQTTKit-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/MQTTKit-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/MQTTKit-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-webassembly-wasm32/MQTTKit-t.build/Objects-normal/wasm32/Modules/MQTTKit.swiftmodule
error: Build failed
BUILD FAILURE 6.4 wasm