Swift Package IndexBuild Information
Failed to build AsyncChannels, reference main (0fed3c), with Swift 6.4 for Wasm on 24 Sep 2026 13:21:33 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-54344847-0":/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>&1Build Log
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RunAll
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Builder version: 5.1.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/gh123man/Async-Channels.git
Reference: main
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/gh123man/Async-Channels
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 0fed3c0 Improve benchmark harness and compare Swift 6.3 performance (#24)
Cloned https://github.com/gh123man/Async-Channels.git
Revision (git rev-parse @):
0fed3c0a90214bfd8cf129d091e648b1b516b6da
SUCCESS checkout https://github.com/gh123man/Async-Channels.git at main
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Build
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Selected platform: wasm
Swift version: 6.4
Building package at path: $PWD
https://github.com/gh123man/Async-Channels.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344847-0":/host -w "$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
Fetching https://github.com/apple/swift-collections
[1/27702] Fetching swift-collections
Fetched https://github.com/apple/swift-collections (1.37s)
Computing version for https://github.com/apple/swift-collections
Computed https://github.com/apple/swift-collections at 1.7.0 (1.67s)
Creating working copy for https://github.com/apple/swift-collections
Working copy of https://github.com/apple/swift-collections resolved at 1.7.0
Building for debugging...
[Computing dependencies]
[Pre-planning 1 / 328]
[Planning deferred tasks]
[63 / 134] InternalCollectionsUtilities
[72 / 143] InternalCollectionsUtilities
[85 / 150] OrderedCollections
[95 / 169] InternalCollectionsUtilities
[97 / 169] _RopeModule
[98 / 170] _RopeModule
[99 / 170] _RopeModule
[100 / 170] _RopeModule
[104 / 170] SpanPreview
[106 / 170] _RopeModule
[115 / 170] OrderedCollections
[118 / 170] OrderedCollections
[120 / 170] InternalCollectionsUtilities
[124 / 172] InternalCollectionsUtilities
[127 / 189] HashTreeCollections
[130 / 189] HeapModule
[133 / 190] HeapModule
[144 / 191] OrderedCollections
[147 / 191] OrderedCollections
[150 / 192] HeapModule
[152 / 192] HeapModule
[154 / 202] InternalCollectionsUtilities
[156 / 202] InternalCollectionsUtilities
[158 / 202] HashTreeCollections
[161 / 202] BitCollections
[167 / 202] BitCollections
[169 / 204] SpanPreview
[177 / 213] DequeModule
[180 / 213] DequeModule
[183 / 214] HashTreeCollections
[192 / 214] DequeModule
[192 / 215] DequeModule
error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line: cd /host
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: [1;31merror: [1;39mcannot find 'pthread_mutexattr_init' in scope[0;0m
[0;36m33 |[0;0m var m = pthread_mutex_t()
[0;36m34 |[0;0m var attr = pthread_mutexattr_t()
[0;36m35 |[0;0m [4;39mpthread_mutexattr_init[0;0m(&attr)
[0;36m|[0;0m `- [1;31merror: [1;39mcannot find 'pthread_mutexattr_init' in scope[0;0m
[0;36m36 |[0;0m pthread_mutexattr_settype(&attr, 3) // Faster under contention
[0;36m37 |[0;0m precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: [1;31merror: [1;39mcannot find 'pthread_mutexattr_settype' in scope[0;0m
[0;36m34 |[0;0m var attr = pthread_mutexattr_t()
[0;36m35 |[0;0m pthread_mutexattr_init(&attr)
[0;36m36 |[0;0m [4;39mpthread_mutexattr_settype[0;0m(&attr, 3) // Faster under contention
[0;36m|[0;0m `- [1;31merror: [1;39mcannot find 'pthread_mutexattr_settype' in scope[0;0m
[0;36m37 |[0;0m precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
[0;36m38 |[0;0m pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: [1;31merror: [1;39mcannot find 'pthread_mutex_init' in scope[0;0m
[0;36m35 |[0;0m pthread_mutexattr_init(&attr)
[0;36m36 |[0;0m pthread_mutexattr_settype(&attr, 3) // Faster under contention
[0;36m37 |[0;0m precondition([4;39mpthread_mutex_init[0;0m(&m, &attr) == 0, "pthread_mutex_init failed")
[0;36m|[0;0m `- [1;31merror: [1;39mcannot find 'pthread_mutex_init' in scope[0;0m
[0;36m38 |[0;0m pthread_mutexattr_destroy(&attr)
[0;36m39 |[0;0m return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: [1;31merror: [1;39mcannot find 'pthread_mutexattr_destroy' in scope[0;0m
[0;36m36 |[0;0m pthread_mutexattr_settype(&attr, 3) // Faster under contention
[0;36m37 |[0;0m precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
[0;36m38 |[0;0m [4;39mpthread_mutexattr_destroy[0;0m(&attr)
[0;36m|[0;0m `- [1;31merror: [1;39mcannot find 'pthread_mutexattr_destroy' in scope[0;0m
[0;36m39 |[0;0m return m
[0;36m40 |[0;0m }()
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Sources/AsyncChannels/Channel+Extensions.swift /host/spi-builder-workspace/Sources/AsyncChannels/Channel.swift /host/spi-builder-workspace/Sources/AsyncChannels/ChannelInternal.swift /host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift /host/spi-builder-workspace/Sources/AsyncChannels/Select.swift /host/spi-builder-workspace/Sources/AsyncChannels/Synchronization.swift /host/spi-builder-workspace/Sources/AsyncChannels/ThrowingChannel+Extensions.swift /host/spi-builder-workspace/Sources/AsyncChannels/ThrowingChannel.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 6 -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/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name AsyncChannels -package-name spi_builder_workspace -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/AsyncChannels_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/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/Modules/AsyncChannels.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/Modules/AsyncChannels.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/AsyncChannels-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/AsyncChannels-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/AsyncChannels-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/AsyncChannels.build/Debug-webassembly-wasm32/AsyncChannels-t.build/Objects-normal/wasm32/Modules/AsyncChannels.swiftmodule
error: Build failed
BUILD FAILURE 6.4 wasm