MQTTKit – Build Information – Swift Package Index

Build Information

Failed to build MQTTKit, reference master (ec8946), with Swift 6.4 for Linux on 16 Sep 2026 10:43:33 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/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/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:         linux
Swift version:             6.4
Building package at path:  $PWD
https://github.com/arnecs/mqttkit.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/host -w "$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]
/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     }
[27 / 35] MQTTKit
error: SwiftCompile normal x86_64 /host/spi-builder-workspace/Sources/MQTTSession.swift failed with a nonzero exit code. Command line:     cd /host
    builtin-SwiftPerFileCompile MQTTSession.swift
/host/spi-builder-workspace/Sources/MQTTSession.swift:137:154: [1;33mwarning: [1;39m'weak' ownership of capture 'self' differs from implicitly-captured strong reference in outer scope[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture\ImplicitStrongCapture]8;;\]
[0;36m134 |[0;0m         }
[0;36m135 |[0;0m
[0;36m136 |[0;0m         DispatchQueue.main.async {
    [0;36m|[0;0m                                  |- [1;39mnote: [1;39m'self' implicitly strongly captured here[0;0m
    [0;36m|[0;0m                                  `- [1;39mnote: [1;39madd 'self' as a capture list item to silence[0;0m
[0;36m137 |[0;0m             self.keepAliveTimer = Timer.scheduledTimer(withTimeInterval: TimeInterval(self.options.keepAliveInterval / 2), repeats: true, block: { [weak self] timer in
    [0;36m|[0;0m                                                                                                                                                          |- [1;33mwarning: [1;39m'weak' ownership of capture 'self' differs from implicitly-captured strong reference in outer scope[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture\ImplicitStrongCapture]8;;\]
    [0;36m|[0;0m                                                                                                                                                          `- [1;39mnote: [1;39mexplicitly assign the capture list item to silence[0;0m
[0;36m138 |[0;0m                 guard self?.outputStream?.streamStatus == .open,
[0;36m139 |[0;0m                     -self!.lastServerResponse.timeIntervalSinceNow < Double(self!.options.keepAliveInterval) * 1.5  else {
/host/spi-builder-workspace/Sources/MQTTSession.swift:174:16: [1;31merror: [1;39mfailed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)[0;0m
[0;36m172 |[0;0m         var outputStream: OutputStream?
[0;36m173 |[0;0m
[0;36m174 |[0;0m         [4;39mStream.getStreamsToHost([0;0m
    [0;36m|[0;0m                `- [1;31merror: [1;39mfailed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)[0;0m
[0;36m175 |[0;0m             withName: options.host,
[0;36m176 |[0;0m             port: options.port,
/host/spi-builder-workspace/Sources/MQTTSession.swift:188:51: [1;31merror: [1;39mcannot find 'RunLoopMode' in scope[0;0m
[0;36m186 |[0;0m         output.delegate = self
[0;36m187 |[0;0m
[0;36m188 |[0;0m         input.schedule(in: RunLoop.main, forMode: [4;39mRunLoopMode[0;0m.defaultRunLoopMode)
    [0;36m|[0;0m                                                   `- [1;31merror: [1;39mcannot find 'RunLoopMode' in scope[0;0m
[0;36m189 |[0;0m         output.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
[0;36m190 |[0;0m
/host/spi-builder-workspace/Sources/MQTTSession.swift:189:52: [1;31merror: [1;39mcannot find 'RunLoopMode' in scope[0;0m
[0;36m187 |[0;0m
[0;36m188 |[0;0m         input.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
[0;36m189 |[0;0m         output.schedule(in: RunLoop.main, forMode: [4;39mRunLoopMode[0;0m.defaultRunLoopMode)
    [0;36m|[0;0m                                                    `- [1;31merror: [1;39mcannot find 'RunLoopMode' in scope[0;0m
[0;36m190 |[0;0m
[0;36m191 |[0;0m         if options.useTLS {
/host/spi-builder-workspace/Sources/MQTTSession.swift:192:57: [1;31merror: [1;39margument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type[0;0m
[0;36m190 |[0;0m
[0;36m191 |[0;0m         if options.useTLS {
[0;36m192 |[0;0m             input.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
    [0;36m|[0;0m                                                         `- [1;31merror: [1;39margument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type[0;0m
[0;36m193 |[0;0m             output.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
[0;36m194 |[0;0m         }
/host/spi-builder-workspace/Sources/MQTTSession.swift:193:58: [1;31merror: [1;39margument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type[0;0m
[0;36m191 |[0;0m         if options.useTLS {
[0;36m192 |[0;0m             input.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
[0;36m193 |[0;0m             output.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
    [0;36m|[0;0m                                                          `- [1;31merror: [1;39margument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type[0;0m
[0;36m194 |[0;0m         }
[0;36m195 |[0;0m
/host/spi-builder-workspace/Sources/MQTTSession.swift:197:13: [1;33mwarning: [1;39mcapture of 'input' with non-Sendable type 'InputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
[0;36m195 |[0;0m
[0;36m196 |[0;0m         DispatchQueue.global(qos: .userInitiated).async {
[0;36m197 |[0;0m             input.open()
    [0;36m|[0;0m             `- [1;33mwarning: [1;39mcapture of 'input' with non-Sendable type 'InputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
[0;36m198 |[0;0m             output.open()
[0;36m199 |[0;0m
Foundation.InputStream:1:12: [1;39mnote: [1;39mclass 'InputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m1 |[0;0m open class InputStream : Stream {
   [0;36m|[0;0m            `- [1;39mnote: [1;39mclass 'InputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m2 |[0;0m     open func read(_ buffer: UnsafeMutablePointer<UInt8>, maxLength len: Int) -> Int
 [0;36m3 |[0;0m     open func getBuffer(_ buffer: UnsafeMutablePointer<UnsafeMutablePointer<UInt8>?>, length len: UnsafeMutablePointer<Int>) -> Bool
/host/spi-builder-workspace/Sources/MQTTSession.swift:198:13: [1;33mwarning: [1;39mcapture of 'output' with non-Sendable type 'OutputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
[0;36m196 |[0;0m         DispatchQueue.global(qos: .userInitiated).async {
[0;36m197 |[0;0m             input.open()
[0;36m198 |[0;0m             output.open()
    [0;36m|[0;0m             `- [1;33mwarning: [1;39mcapture of 'output' with non-Sendable type 'OutputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
[0;36m199 |[0;0m
[0;36m200 |[0;0m             while input.streamStatus == .opening || output.streamStatus == .opening {
Foundation.OutputStream:1:12: [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m1 |[0;0m open class OutputStream : Stream {
   [0;36m|[0;0m            `- [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m2 |[0;0m     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 [0;36m3 |[0;0m     open var hasSpaceAvailable: Bool { get }
/host/spi-builder-workspace/Sources/MQTTSession.swift:200:53: [1;33mwarning: [1;39mimplicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode[0;0m
[0;36m198 |[0;0m             output.open()
[0;36m199 |[0;0m
[0;36m200 |[0;0m             while input.streamStatus == .opening || output.streamStatus == .opening {
    [0;36m|[0;0m                                                     `- [1;33mwarning: [1;39mimplicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode[0;0m
[0;36m201 |[0;0m                 usleep(1000)
[0;36m202 |[0;0m             }
Foundation.OutputStream:1:12: [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m1 |[0;0m open class OutputStream : Stream {
   [0;36m|[0;0m            `- [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m2 |[0;0m     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 [0;36m3 |[0;0m     open var hasSpaceAvailable: Bool { get }
/host/spi-builder-workspace/Sources/MQTTSession.swift:204:47: [1;33mwarning: [1;39mimplicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode[0;0m
[0;36m202 |[0;0m             }
[0;36m203 |[0;0m
[0;36m204 |[0;0m             if input.streamStatus != .open || output.streamStatus != .open {
    [0;36m|[0;0m                                               `- [1;33mwarning: [1;39mimplicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode[0;0m
[0;36m205 |[0;0m                 completion(nil)
[0;36m206 |[0;0m                 return
Foundation.OutputStream:1:12: [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m1 |[0;0m open class OutputStream : Stream {
   [0;36m|[0;0m            `- [1;39mnote: [1;39mclass 'OutputStream' does not conform to the 'Sendable' protocol[0;0m
 [0;36m2 |[0;0m     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 [0;36m3 |[0;0m     open var hasSpaceAvailable: Bool { get }
[#ImplicitStrongCapture]: <https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture>
[#SendableClosureCaptures]: <https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures>
Failed frontend command:
/usr/bin/swift-frontend -frontend -c /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 -primary-file /host/spi-builder-workspace/Sources/MQTTSession.swift /host/spi-builder-workspace/Sources/MQTTSessionDelegate.swift -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.d -emit-const-values-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.swiftconstvalues -emit-reference-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.swiftdeps -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.dia -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 -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/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/DerivedSources-normal/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/DerivedSources/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/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-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTKit_const_extract_protocols.json -in-process-plugin-server-path /usr/lib/swift/host/libSwiftInProcPluginServer.so -plu[32 / 35] MQTTKit
gin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.o -index-unit-output-path /MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTSession.o -index-store-path /host/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 linux