Swift Package Index

Build Information

Failed to build MQTTKit, reference 0.1.0 (e33bd0), with Swift 6.4 for Linux on 16 Sep 2026 10:42:22 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-53886770-0":/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/arnecs/mqttkit.git
Reference: 0.1.0
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
 * tag               0.1.0      -> FETCH_HEAD
HEAD is now at e33bd0a Package.swift, and restructure of source files
Cloned https://github.com/arnecs/mqttkit.git
Revision (git rev-parse @):
e33bd0ac53d35c5033734eec459ea84162952308
SUCCESS checkout https://github.com/arnecs/mqttkit.git at 0.1.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.4
Building package at path:  $PWD
https://github.com/arnecs/mqttkit.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-53886770-0":/host -w "$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]
/host/spi-builder-workspace/Sources/Constants.swift:42:5: warning: 'public' modifier is redundant for operator function declared in a public extension
 40 |
 41 | public extension MQTTQoSLevel {
 42 |     public static func <(lhs: MQTTQoSLevel, rhs: MQTTQoSLevel) -> Bool {
    |     `- warning: 'public' modifier is redundant for operator function declared in a public extension
 43 |         return lhs.rawValue < rhs.rawValue
 44 |     }
[24 / 32] MQTTKit
error: SwiftCompile normal x86_64 /host/spi-builder-workspace/Sources/MQTTKit.swift failed with a nonzero exit code. Command line:     cd /host
    builtin-SwiftPerFileCompile MQTTKit.swift
/host/spi-builder-workspace/Sources/MQTTKit.swift:224:16: error: failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)
222 |         var outputStream: OutputStream?
223 |
224 |         Stream.getStreamsToHost(
    |                `- error: failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs)
225 |             withName: options.host,
226 |             port: options.port,
/host/spi-builder-workspace/Sources/MQTTKit.swift:239:51: error: cannot find 'RunLoopMode' in scope
237 |
238 |
239 |         input.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
    |                                                   `- error: cannot find 'RunLoopMode' in scope
240 |         output.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
241 |
/host/spi-builder-workspace/Sources/MQTTKit.swift:240:52: error: cannot find 'RunLoopMode' in scope
238 |
239 |         input.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
240 |         output.schedule(in: RunLoop.main, forMode: RunLoopMode.defaultRunLoopMode)
    |                                                    `- error: cannot find 'RunLoopMode' in scope
241 |
242 |         if options.useTLS {
/host/spi-builder-workspace/Sources/MQTTKit.swift:243:57: error: argument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type
241 |
242 |         if options.useTLS {
243 |             input.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
    |                                                         `- error: argument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type
244 |             output.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
245 |         }
/host/spi-builder-workspace/Sources/MQTTKit.swift:244:58: error: argument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type
242 |         if options.useTLS {
243 |             input.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
244 |             output.setProperty(StreamSocketSecurityLevel.tlSv1, forKey: .socketSecurityLevelKey)
    |                                                          `- error: argument type 'StreamSocketSecurityLevel' expected to be an instance of a class or class-constrained type
245 |         }
246 |
/host/spi-builder-workspace/Sources/MQTTKit.swift:248:13: warning: capture of 'input' with non-Sendable type 'InputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
246 |
247 |         DispatchQueue.global(qos: .userInitiated).async {
248 |             input.open()
    |             `- warning: capture of 'input' with non-Sendable type 'InputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
249 |             output.open()
250 |
Foundation.InputStream:1:12: note: class 'InputStream' does not conform to the 'Sendable' protocol
 1 | open class InputStream : Stream {
   |            `- note: class 'InputStream' does not conform to the 'Sendable' protocol
 2 |     open func read(_ buffer: UnsafeMutablePointer<UInt8>, maxLength len: Int) -> Int
 3 |     open func getBuffer(_ buffer: UnsafeMutablePointer<UnsafeMutablePointer<UInt8>?>, length len: UnsafeMutablePointer<Int>) -> Bool
/host/spi-builder-workspace/Sources/MQTTKit.swift:249:13: warning: capture of 'output' with non-Sendable type 'OutputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
247 |         DispatchQueue.global(qos: .userInitiated).async {
248 |             input.open()
249 |             output.open()
    |             `- warning: capture of 'output' with non-Sendable type 'OutputStream' in a '@Sendable' closure; this is an error in the Swift 6 language mode [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/sendable-closure-captures\SendableClosureCaptures]8;;\]
250 |
251 |             while input.streamStatus == .opening || output.streamStatus == .opening {
Foundation.OutputStream:1:12: note: class 'OutputStream' does not conform to the 'Sendable' protocol
 1 | open class OutputStream : Stream {
   |            `- note: class 'OutputStream' does not conform to the 'Sendable' protocol
 2 |     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 3 |     open var hasSpaceAvailable: Bool { get }
/host/spi-builder-workspace/Sources/MQTTKit.swift:251:53: warning: implicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode
249 |             output.open()
250 |
251 |             while input.streamStatus == .opening || output.streamStatus == .opening {
    |                                                     `- warning: implicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode
252 |                 usleep(1000)
253 |             }
Foundation.OutputStream:1:12: note: class 'OutputStream' does not conform to the 'Sendable' protocol
 1 | open class OutputStream : Stream {
   |            `- note: class 'OutputStream' does not conform to the 'Sendable' protocol
 2 |     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 3 |     open var hasSpaceAvailable: Bool { get }
/host/spi-builder-workspace/Sources/MQTTKit.swift:255:47: warning: implicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode
253 |             }
254 |
255 |             if input.streamStatus != .open || output.streamStatus != .open {
    |                                               `- warning: implicit capture of 'output' requires that 'OutputStream' conforms to 'Sendable'; this is an error in the Swift 6 language mode
256 |                 completion(nil)
257 |                 return
Foundation.OutputStream:1:12: note: class 'OutputStream' does not conform to the 'Sendable' protocol
 1 | open class OutputStream : Stream {
   |            `- note: class 'OutputStream' does not conform to the 'Sendable' protocol
 2 |     open func write(_ buffer: UnsafePointer<UInt8>, maxLength len: Int) -> Int
 3 |     open var hasSpaceAvailable: Bool { get }
/host/spi-builder-workspace/Sources/MQTTKit.swift:294:27: warning: 'deallocate(capacity:)' is deprecated: Swift currently only supports freeing entire heap blocks, use deallocate() instead [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/deprecated-declaration\DeprecatedDeclaration]8;;\]
292 |         defer {
293 |             messageBuffer.deinitialize(count: options.bufferSize)
294 |             messageBuffer.deallocate(capacity: options.bufferSize)
    |                           `- warning: 'deallocate(capacity:)' is deprecated: Swift currently only supports freeing entire heap blocks, use deallocate() instead [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/deprecated-declaration\DeprecatedDeclaration]8;;\]
295 |         }
296 |
[#DeprecatedDeclaration]: <https://docs.swift.org/compiler/documentation/diagnostics/deprecated-declaration>
[#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 -primary-file /host/spi-builder-workspace/Sources/MQTTKit.swift /host/spi-builder-workspace/Sources/MQTTPacket.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/MQTTKit.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/MQTTKit.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/MQTTKit.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/MQTTKit.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 -plugin-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/MQTTKit.o -index-unit-output-path /MQTTKit.build/Debug-linux-x86_64/MQTTKit-t.build/Objects-normal/x86_64/MQTTKit.o -index-store-path /host/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 linux