Swift Package Index

Build Information

Failed to build ReactiveStreams, reference main (b66ce5), with Swift 6.4 for macOS (SPM) on 17 Sep 2026 10:30:08 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build 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/glessard/swift-reactive-streams.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/glessard/swift-reactive-streams
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at b66ce52 update dependencies
Cloned https://github.com/glessard/swift-reactive-streams.git
Revision (git rev-parse @):
b66ce52b4b043b3ac49e35b6ecfa93e6f394f284
SUCCESS checkout https://github.com/glessard/swift-reactive-streams.git at main
========================================
Build
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Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/glessard/swift-reactive-streams.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Constructing description]
[Planning deferred tasks]
[35 / 63]
[37 / 64] CAtomics
[44 / 75]
[54 / 99]
[61 / 99] CAtomics
[63 / 99]
[65 / 99]
[66 / 99]
[68 / 99]
[70 / 99]
[74 / 99] CurrentQoS
[81 / 100] deferred
[90 / 126]
[93 / 126]
[95 / 126]
[97 / 126]
[98 / 126]
[109 / 126] deferred
[116 / 127] deferred
[116 / 127] ReactiveStreams
[126 / 138] ReactiveStreams
Fetching https://github.com/glessard/deferred.git
Fetching https://github.com/glessard/CurrentQoS.git
Fetching https://github.com/glessard/CAtomics.git
[1/150] Fetching currentqos
[60/7651] Fetching currentqos, deferred
[452/10788] Fetching currentqos, deferred, catomics
Fetched https://github.com/glessard/CurrentQoS.git (1.25s)
Fetched https://github.com/glessard/CAtomics.git (1.25s)
Fetched https://github.com/glessard/deferred.git (1.25s)
Computing version for https://github.com/glessard/deferred.git
Computed https://github.com/glessard/deferred.git at 6.7.1 (1.94s)
Computing version for https://github.com/glessard/CAtomics.git
Computed https://github.com/glessard/CAtomics.git at 6.5.1 (2.14s)
Computing version for https://github.com/glessard/CurrentQoS.git
Computed https://github.com/glessard/CurrentQoS.git at 1.2.2 (0.62s)
Creating working copy for https://github.com/glessard/deferred.git
Working copy of https://github.com/glessard/deferred.git resolved at 6.7.1
Creating working copy for https://github.com/glessard/CAtomics.git
Working copy of https://github.com/glessard/CAtomics.git resolved at 6.5.1
Creating working copy for https://github.com/glessard/CurrentQoS.git
Working copy of https://github.com/glessard/CurrentQoS.git resolved at 1.2.2
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/validated-queue.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile validated-queue.swift
/Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/validated-queue.swift:15:50: warning: static property 'current' cannot be used in a default argument value because 'CurrentQoS' was not imported by this file; this is an error in the Swift 6 language mode
13 |   let queue: DispatchQueue
14 |
15 |   public init(label: String, qos: DispatchQoS = .current)
   |                                                  |- warning: static property 'current' cannot be used in a default argument value because 'CurrentQoS' was not imported by this file; this is an error in the Swift 6 language mode
   |                                                  `- note: The missing import of module 'CurrentQoS' will be added implicitly
16 |   {
17 |     self.queue = DispatchQueue(label: label+"-\(qos.qosClass)", qos: qos)
/Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/validated-queue.swift:23:18: error: 'OS_dispatch_queue_serial' has been renamed to 'DispatchSerialQueue'
21 |   {
22 | #if (os(macOS) || os(iOS) || os(tvOS) || os(watchOS))
23 |     if target is OS_dispatch_queue_serial
   |                  `- error: 'OS_dispatch_queue_serial' has been renamed to 'DispatchSerialQueue'
24 |     {
25 |       self.queue = target
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk/usr/include/dispatch/queue.h:149:1: note: 'OS_dispatch_queue_serial' was obsoleted in Swift 3
 147 |  */
 148 | API_AVAILABLE(macos(10.14), ios(12.0), tvos(12.0), watchos(5.0))
 149 | DISPATCH_DECL_SERIAL_EXECUTOR_SWIFT(dispatch_queue_serial, DispatchSerialQueue);
     | `- note: 'OS_dispatch_queue_serial' was obsoleted in Swift 3
 150 |
 151 | /*!
Failed frontend command:
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/Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-map.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-merge.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-next.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-notifications.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-notifier.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-onrequest.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-paused.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-post.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-reduce.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-skip.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-split.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-substream.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream-timer.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/stream.swift /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/subscriber.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/subscription.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/ReactiveStreams/validated-queue.swift -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/Objects-normal/arm64/subscription.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/Objects-normal/arm64/subscription.swiftconstvalues -emit-reference-dependencies-path 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/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/Objects-normal/arm64/validated-queue.dia -target arm64-apple-macos12.0 -disable-cross-import-overlay-search -swift-module-cross-import Darwin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/Darwin.swiftcrossimport/xlocale.swiftoverlay -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libFoundationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#FoundationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libObservationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#ObservationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libSwiftMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#SwiftMacros -disable-implicit-swift-modules -Xcc -fno-implicit-modules -Xcc -fno-implicit-module-maps -explicit-swift-module-map-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/Objects-normal/arm64/ReactiveStreams-dependencies-1.json -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -I /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -Isystem /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/PackageFrameworks -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -F /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -module-cache-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftExplicitPrecompiledModules -color-diagnostics -Xcc -fcolor-diagnostics -enable-testing -g -debug-info-format\=dwarf -dwarf-version\=4 -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder -Xcc -fmodule-map-file\=/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/GeneratedModuleMaps/CAtomics.modulemap -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.build/out/SDKStatCaches.noindex/macosx27.0-26A425-80c5bbf1d171475443272936d42f90a36a22442a12e9d48fe1a705f55a1adfc4.sdkstatcache -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/checkouts/CAtomics/Sources/CAtomics/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name ReactiveStreams -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/ReactiveStreams.build/Debug/ReactiveStreams-t.build/Objects-normal/arm64/ReactiveStreams_const_extract_protocols.json -disable-clang-spi -clang-target arm64-apple-macos27.0 -target-sdk-version 27.0 -target-sdk-name macosx27.0 -in-process-plugin-server-path 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/Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm