Swift Package IndexBuild Information
Failed to build AsyncChannels, reference main (0fed3c), with Swift 6.3 for Wasm on 13 Apr 2026 01:41:23 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-4609320-3":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3-RELEASE_wasm 2>&1Build Log
========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
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
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/gh123man/Async-Channels.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-3":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3-RELEASE_wasm 2>&1
wasm-6.3-latest: Pulling from swiftpackageindex/spi-images
Digest: sha256:d69f4e7582c319245442d62a08b2d7c7fd5a0c0c69f5d2ef11d1530cd8d3329b
Status: Image is up to date for registry.gitlab.com/swiftpackageindex/spi-images:wasm-6.3-latest
Fetching https://github.com/apple/swift-collections
[1/23525] Fetching swift-collections
Fetched https://github.com/apple/swift-collections from cache (1.49s)
Computing version for https://github.com/apple/swift-collections
Computed https://github.com/apple/swift-collections at 1.4.1 (2.51s)
Creating working copy for https://github.com/apple/swift-collections
Working copy of https://github.com/apple/swift-collections resolved at 1.4.1
Building for debugging...
[0/11] Write sources
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[422/422] Emitting module Collections
[424/431] Compiling AsyncChannels ThrowingChannel+Extensions.swift
/host/spi-builder-workspace/Sources/AsyncChannels/ThrowingChannel+Extensions.swift:21:25: error: cannot find 'DispatchSemaphore' in scope
19 | /// Do not use this function in an async task!
20 | public func blockingSend(_ val: T) throws {
21 | let semaphore = DispatchSemaphore(value: 0)
| `- error: cannot find 'DispatchSemaphore' in scope
22 | Task {
23 | // TODO
/host/spi-builder-workspace/Sources/AsyncChannels/ThrowingChannel+Extensions.swift:34:25: error: cannot find 'DispatchSemaphore' in scope
32 | /// Do not use this function in an async task!
33 | public func blockingReceive() -> T? {
34 | let semaphore = DispatchSemaphore(value: 0)
| `- error: cannot find 'DispatchSemaphore' in scope
35 | nonisolated(unsafe) var val: T?
36 | Task {
[425/432] Compiling AsyncChannels ThrowingChannel.swift
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: error: cannot find 'pthread_mutexattr_init' in scope
33 | var m = pthread_mutex_t()
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
| `- error: cannot find 'pthread_mutexattr_init' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: error: cannot find 'pthread_mutexattr_settype' in scope
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
| `- error: cannot find 'pthread_mutexattr_settype' in scope
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: error: cannot find 'pthread_mutex_init' in scope
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
| `- error: cannot find 'pthread_mutex_init' in scope
38 | pthread_mutexattr_destroy(&attr)
39 | return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: error: cannot find 'pthread_mutexattr_destroy' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
| `- error: cannot find 'pthread_mutexattr_destroy' in scope
39 | return m
40 | }()
[426/432] Compiling AsyncChannels Channel+Extensions.swift
/host/spi-builder-workspace/Sources/AsyncChannels/Channel+Extensions.swift:21:25: error: cannot find 'DispatchSemaphore' in scope
19 | /// Do not use this function in an async task!
20 | public func blockingSend(_ val: T) {
21 | let semaphore = DispatchSemaphore(value: 0)
| `- error: cannot find 'DispatchSemaphore' in scope
22 | Task {
23 | await self <- val
/host/spi-builder-workspace/Sources/AsyncChannels/Channel+Extensions.swift:33:25: error: cannot find 'DispatchSemaphore' in scope
31 | /// Do not use this function in an async task!
32 | public func blockingReceive() -> T? {
33 | let semaphore = DispatchSemaphore(value: 0)
| `- error: cannot find 'DispatchSemaphore' in scope
34 | nonisolated(unsafe) var val: T?
35 | Task {
error: emit-module command failed with exit code 1 (use -v to see invocation)
[427/432] Emitting module AsyncChannels
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: error: cannot find 'pthread_mutexattr_init' in scope
33 | var m = pthread_mutex_t()
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
| `- error: cannot find 'pthread_mutexattr_init' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: error: cannot find 'pthread_mutexattr_settype' in scope
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
| `- error: cannot find 'pthread_mutexattr_settype' in scope
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: error: cannot find 'pthread_mutex_init' in scope
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
| `- error: cannot find 'pthread_mutex_init' in scope
38 | pthread_mutexattr_destroy(&attr)
39 | return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: error: cannot find 'pthread_mutexattr_destroy' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
| `- error: cannot find 'pthread_mutexattr_destroy' in scope
39 | return m
40 | }()
[428/432] Compiling AsyncChannels ChannelInternal.swift
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: error: cannot find 'pthread_mutexattr_init' in scope
33 | var m = pthread_mutex_t()
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
| `- error: cannot find 'pthread_mutexattr_init' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: error: cannot find 'pthread_mutexattr_settype' in scope
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
| `- error: cannot find 'pthread_mutexattr_settype' in scope
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: error: cannot find 'pthread_mutex_init' in scope
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
| `- error: cannot find 'pthread_mutex_init' in scope
38 | pthread_mutexattr_destroy(&attr)
39 | return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: error: cannot find 'pthread_mutexattr_destroy' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
| `- error: cannot find 'pthread_mutexattr_destroy' in scope
39 | return m
40 | }()
[429/432] Compiling AsyncChannels Channel.swift
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: error: cannot find 'pthread_mutexattr_init' in scope
33 | var m = pthread_mutex_t()
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
| `- error: cannot find 'pthread_mutexattr_init' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: error: cannot find 'pthread_mutexattr_settype' in scope
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
| `- error: cannot find 'pthread_mutexattr_settype' in scope
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: error: cannot find 'pthread_mutex_init' in scope
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
| `- error: cannot find 'pthread_mutex_init' in scope
38 | pthread_mutexattr_destroy(&attr)
39 | return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: error: cannot find 'pthread_mutexattr_destroy' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
| `- error: cannot find 'pthread_mutexattr_destroy' in scope
39 | return m
40 | }()
[430/432] Compiling AsyncChannels Synchronization.swift
[431/432] Compiling AsyncChannels Select.swift
[432/432] Compiling AsyncChannels FastLock.swift
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:35:7: error: cannot find 'pthread_mutexattr_init' in scope
33 | var m = pthread_mutex_t()
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
| `- error: cannot find 'pthread_mutexattr_init' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:36:7: error: cannot find 'pthread_mutexattr_settype' in scope
34 | var attr = pthread_mutexattr_t()
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
| `- error: cannot find 'pthread_mutexattr_settype' in scope
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:37:20: error: cannot find 'pthread_mutex_init' in scope
35 | pthread_mutexattr_init(&attr)
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
| `- error: cannot find 'pthread_mutex_init' in scope
38 | pthread_mutexattr_destroy(&attr)
39 | return m
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:38:7: error: cannot find 'pthread_mutexattr_destroy' in scope
36 | pthread_mutexattr_settype(&attr, 3) // Faster under contention
37 | precondition(pthread_mutex_init(&m, &attr) == 0, "pthread_mutex_init failed")
38 | pthread_mutexattr_destroy(&attr)
| `- error: cannot find 'pthread_mutexattr_destroy' in scope
39 | return m
40 | }()
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:43:7: error: cannot find 'pthread_mutex_destroy' in scope
41 |
42 | deinit {
43 | pthread_mutex_destroy(&m)
| `- error: cannot find 'pthread_mutex_destroy' in scope
44 | }
45 |
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:48:7: error: cannot find 'pthread_mutex_lock' in scope
46 | @inline(__always)
47 | func lock() {
48 | pthread_mutex_lock(&m)
| `- error: cannot find 'pthread_mutex_lock' in scope
49 | }
50 |
/host/spi-builder-workspace/Sources/AsyncChannels/FastLock.swift:53:7: error: cannot find 'pthread_mutex_unlock' in scope
51 | @inline(__always)
52 | func unlock() {
53 | pthread_mutex_unlock(&m)
| `- error: cannot find 'pthread_mutex_unlock' in scope
54 | }
55 | }
BUILD FAILURE 6.3 wasm