Swift Package IndexBuild Information
Failed to build RxWebSocket, reference 2.2.0 (2341fa), with Swift 6.3 for Linux on 10 Apr 2026 13:07:19 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/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:basic-6.3-latest swift build --triple x86_64-unknown-linux-gnu 2>&1Build Log
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/fjcaetano/RxWebSocket.git
Reference: 2.2.0
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/fjcaetano/RxWebSocket
* tag 2.2.0 -> FETCH_HEAD
HEAD is now at 2341fab Version Bump (2.2.0)
Submodule path 'fastlane/actions/codecov': checked out '75911fa21bda7824d7fe638eb3ff0f5d5f8ffe9a'
Submodule 'fastlane/actions/codecov' (https://gist.github.com/04126b3051f6cd6aebe041bb1dfe14e9.git) registered for path 'fastlane/actions/codecov'
Cloning into '/host/spi-builder-workspace/fastlane/actions/codecov'...
Cloned https://github.com/fjcaetano/RxWebSocket.git
Revision (git rev-parse @):
2341fabc92e8a79a494be19bc3235987c47e945d
SUCCESS checkout https://github.com/fjcaetano/RxWebSocket.git at 2.2.0
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Build
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Selected platform: linux
Swift version: 6.3
Building package at path: $PWD
https://github.com/fjcaetano/RxWebSocket.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/swiftpackageindex/spi-images:basic-6.3-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.3-latest: Pulling from swiftpackageindex/spi-images
Digest: sha256:5a7d791d2ead8a924b1292cb31bf3288eabcfe8880e0b005b00b45b71a5bc36a
Status: Image is up to date for registry.gitlab.com/swiftpackageindex/spi-images:basic-6.3-latest
Fetching https://github.com/ReactiveX/RxSwift.git
Fetching https://github.com/daltoniam/Starscream.git
[1/5108] Fetching starscream
[5109/59413] Fetching starscream, rxswift
Fetched https://github.com/daltoniam/Starscream.git from cache (6.87s)
Fetched https://github.com/ReactiveX/RxSwift.git from cache (7.04s)
Computing version for https://github.com/daltoniam/Starscream.git
Computed https://github.com/daltoniam/Starscream.git at 3.1.2 (9.65s)
Fetching https://github.com/apple/swift-nio-zlib-support.git
[1/15] Fetching swift-nio-zlib-support
Fetched https://github.com/apple/swift-nio-zlib-support.git from cache (0.28s)
Computing version for https://github.com/apple/swift-nio-zlib-support.git
Computed https://github.com/apple/swift-nio-zlib-support.git at 1.0.0 (0.76s)
Computing version for https://github.com/ReactiveX/RxSwift.git
Computed https://github.com/ReactiveX/RxSwift.git at 5.1.3 (2.28s)
Creating working copy for https://github.com/apple/swift-nio-zlib-support.git
Working copy of https://github.com/apple/swift-nio-zlib-support.git resolved at 1.0.0
Creating working copy for https://github.com/ReactiveX/RxSwift.git
Working copy of https://github.com/ReactiveX/RxSwift.git resolved at 5.1.3
Creating working copy for https://github.com/daltoniam/Starscream.git
Working copy of https://github.com/daltoniam/Starscream.git resolved at 3.1.2
warning: 'swift-nio-zlib-support': ignoring declared target(s) 'swift-nio-zlib-support' in the system package
Building for debugging...
[0/6] Write sources
[0/6] Write swift-version-24593BA9C3E375BF.txt
[0/6] Write sources
error: emit-module command failed with exit code 1 (use -v to see invocation)
[7/144] Emitting module RxSwift
/host/spi-builder-workspace/.build/checkouts/RxSwift/Sources/RxSwift/AtomicInt.swift:11:13: error: cannot inherit from class 'NSLock' (compiled with Swift 6.3) because it has overridable members that could not be loaded in Swift 5.10
9 | import class Foundation.NSLock
10 |
11 | final class AtomicInt: NSLock {
| `- error: cannot inherit from class 'NSLock' (compiled with Swift 6.3) because it has overridable members that could not be loaded in Swift 5.10
12 | fileprivate var value: Int32
13 | public init(_ value: Int32 = 0) {
[8/162] Compiling Starscream WebSocket.swift
/host/spi-builder-workspace/.build/checkouts/Starscream/Sources/Starscream/Compression.swift:30:8: error: no such module 'zlib'
28 |
29 | import Foundation
30 | import zlib
| `- error: no such module 'zlib'
31 |
32 | class Decompressor {
[9/162] Compiling Starscream SSLSecurity.swift
/host/spi-builder-workspace/.build/checkouts/Starscream/Sources/Starscream/Compression.swift:30:8: error: no such module 'zlib'
28 |
29 | import Foundation
30 | import zlib
| `- error: no such module 'zlib'
31 |
32 | class Decompressor {
error: emit-module command failed with exit code 1 (use -v to see invocation)
[10/162] Emitting module Starscream
/host/spi-builder-workspace/.build/checkouts/Starscream/Sources/Starscream/Compression.swift:30:8: error: no such module 'zlib'
28 |
29 | import Foundation
30 | import zlib
| `- error: no such module 'zlib'
31 |
32 | class Decompressor {
[11/162] Compiling Starscream Compression.swift
/host/spi-builder-workspace/.build/checkouts/Starscream/Sources/Starscream/Compression.swift:30:8: error: no such module 'zlib'
28 |
29 | import Foundation
30 | import zlib
| `- error: no such module 'zlib'
31 |
32 | class Decompressor {
[12/162] Compiling Starscream SSLClientCertificate.swift
/host/spi-builder-workspace/.build/checkouts/Starscream/Sources/Starscream/Compression.swift:30:8: error: no such module 'zlib'
28 |
29 | import Foundation
30 | import zlib
| `- error: no such module 'zlib'
31 |
32 | class Decompressor {
[13/162] Compiling RxSwift CombineLatest+arity.swift
[14/162] Compiling RxSwift CombineLatest.swift
[15/162] Compiling RxSwift CompactMap.swift
[16/162] Compiling RxSwift Completable+AndThen.swift
[17/162] Compiling RxSwift Completable.swift
[18/162] Compiling RxSwift CompositeDisposable.swift
[19/162] Compiling RxSwift Concat.swift
[20/162] Compiling RxSwift ConcurrentDispatchQueueScheduler.swift
[21/162] Compiling RxSwift ConcurrentMainScheduler.swift
[22/162] Compiling RxSwift ConnectableObservableType.swift
[23/162] Compiling RxSwift Create.swift
[24/162] Compiling RxSwift CurrentThreadScheduler.swift
[25/162] Compiling RxSwift Date+Dispatch.swift
[26/162] Compiling RxSwift Debounce.swift
[27/162] Compiling RxSwift Debug.swift
[28/162] Compiling RxSwift DefaultIfEmpty.swift
[29/162] Compiling RxSwift Deferred.swift
[30/162] Compiling RxSwift Delay.swift
[31/162] Compiling RxSwift DelaySubscription.swift
[32/162] Compiling RxSwift SerialDisposable.swift
[33/162] Compiling RxSwift ShareReplayScope.swift
[34/162] Compiling RxSwift Single.swift
[35/162] Compiling RxSwift SingleAssignmentDisposable.swift
[36/162] Compiling RxSwift SingleAsync.swift
[37/162] Compiling RxSwift Sink.swift
[38/162] Compiling RxSwift Skip.swift
[39/162] Compiling RxSwift SkipUntil.swift
[40/162] Compiling RxSwift SkipWhile.swift
[41/162] Compiling RxSwift StartWith.swift
[42/162] Compiling RxSwift SubjectType.swift
[43/162] Compiling RxSwift SubscribeOn.swift
[44/162] Compiling RxSwift SubscriptionDisposable.swift
[45/162] Compiling RxSwift SwiftSupport.swift
[46/162] Compiling RxSwift Switch.swift
[47/162] Compiling RxSwift SwitchIfEmpty.swift
[48/162] Compiling RxSwift SynchronizedDisposeType.swift
[49/162] Compiling RxSwift SynchronizedOnType.swift
BUILD FAILURE 6.3 linux