SwiftWebGPU – Build Information – Swift Package Index

Build Information

Failed to build SwiftWebGPU, reference main (4242a8), with Swift 6.4 for macOS (SPM) on 27 Sep 2026 16:22:08 UTC.

Build Command

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

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/1amageek/swift-webgpu.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/1amageek/swift-webgpu
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 4242a88 Enforce JavaScript owner isolation
Cloned https://github.com/1amageek/swift-webgpu.git
Revision (git rev-parse @):
4242a88e96ca811cccbc54d4e82564461cd4524a
SUCCESS checkout https://github.com/1amageek/swift-webgpu.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/1amageek/swift-webgpu.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Computing dependencies]
[Pre-planning 1 / 215]
[Planning deferred tasks]
[42 / 78]
[45 / 79] _CJavaScriptEventLoop
[52 / 90]
[54 / 90] BridgeJSMacros
[67 / 123] _CJavaScriptEventLoop
[71 / 123]
[75 / 123]
[78 / 123]
[81 / 123]
[83 / 123]
[85 / 123]
[93 / 123] BridgeJSMacros
[94 / 123] BridgeJSMacros
[96 / 123] BridgeJSMacros
[99 / 124] JavaScriptKit
[111 / 136] JavaScriptKit
[118 / 137] JavaScriptEventLoop
[129 / 148] JavaScriptKit
Fetching https://github.com/swiftwasm/JavaScriptKit
[1/40812] Fetching javascriptkit
Fetched https://github.com/swiftwasm/JavaScriptKit (2.55s)
Computing version for https://github.com/swiftwasm/JavaScriptKit
Computed https://github.com/swiftwasm/JavaScriptKit at 0.56.1 (3.31s)
Fetching https://github.com/swiftlang/swift-syntax
[1/80069] Fetching swift-syntax
Fetched https://github.com/swiftlang/swift-syntax (5.61s)
Computing version for https://github.com/swiftlang/swift-syntax
Computed https://github.com/swiftlang/swift-syntax at 603.0.2 (8.73s)
Creating working copy for https://github.com/swiftlang/swift-syntax
Working copy of https://github.com/swiftlang/swift-syntax resolved at 603.0.2
Creating working copy for https://github.com/swiftwasm/JavaScriptKit
Working copy of https://github.com/swiftwasm/JavaScriptKit resolved at 0.56.1
Downloading package prebuilt https://download.swift.org/prebuilts/swift-syntax/603.0.2/swiftlang-6.4.0.34.1-macosx27.0-MacroSupport.zip
Downloaded https://download.swift.org/prebuilts/swift-syntax/603.0.2/swiftlang-6.4.0.34.1-macosx27.0-MacroSupport.zip (1.45s)
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile JavaScriptEventLoop+ExecutorFactory.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:20:32: [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
 [0;36m18 |[0;0m @available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, visionOS 9999, *)
 [0;36m19 |[0;0m @_spi(ExperimentalCustomExecutors)
 [0;36m20 |[0;0m extension JavaScriptEventLoop: [4;39mMainExecutor[0;0m {
    [0;36m|[0;0m                                `- [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
 [0;36m21 |[0;0m     public func run() throws {
 [0;36m22 |[0;0m         // This method is called from `swift_task_asyncMainDrainQueueImpl`.
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:36:32: [1;31merror: [1;39mcannot find type 'SchedulingExecutor' in scope[0;0m
 [0;36m34 |[0;0m @available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, visionOS 9999, *)
 [0;36m35 |[0;0m @_spi(ExperimentalCustomExecutors)
 [0;36m36 |[0;0m extension JavaScriptEventLoop: [4;39mSchedulingExecutor[0;0m {
    [0;36m|[0;0m                                `- [1;31merror: [1;39mcannot find type 'SchedulingExecutor' in scope[0;0m
 [0;36m37 |[0;0m     public func enqueue<C: Clock>(
 [0;36m38 |[0;0m         _ job: consuming ExecutorJob,
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:75:32: [1;31merror: [1;39mcannot find type 'ExecutorFactory' in scope[0;0m
 [0;36m73 |[0;0m @available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, visionOS 9999, *)
 [0;36m74 |[0;0m @_spi(ExperimentalCustomExecutors)
 [0;36m75 |[0;0m extension JavaScriptEventLoop: [4;39mExecutorFactory[0;0m {
    [0;36m|[0;0m                                `- [1;31merror: [1;39mcannot find type 'ExecutorFactory' in scope[0;0m
 [0;36m76 |[0;0m     // Forward all operations to the current thread's JavaScriptEventLoop instance
 [0;36m77 |[0;0m     final class CurrentThread: TaskExecutor, SchedulingExecutor, MainExecutor, SerialExecutor {
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:77:46: [1;31merror: [1;39mcannot find type 'SchedulingExecutor' in scope[0;0m
 [0;36m75 |[0;0m extension JavaScriptEventLoop: ExecutorFactory {
 [0;36m76 |[0;0m     // Forward all operations to the current thread's JavaScriptEventLoop instance
 [0;36m77 |[0;0m     final class CurrentThread: TaskExecutor, [4;39mSchedulingExecutor[0;0m, MainExecutor, SerialExecutor {
    [0;36m|[0;0m                                              `- [1;31merror: [1;39mcannot find type 'SchedulingExecutor' in scope[0;0m
 [0;36m78 |[0;0m         func checkIsolated() {}
 [0;36m79 |[0;0m
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:77:66: [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
 [0;36m75 |[0;0m extension JavaScriptEventLoop: ExecutorFactory {
 [0;36m76 |[0;0m     // Forward all operations to the current thread's JavaScriptEventLoop instance
 [0;36m77 |[0;0m     final class CurrentThread: TaskExecutor, SchedulingExecutor, [4;39mMainExecutor[0;0m, SerialExecutor {
    [0;36m|[0;0m                                                                  `- [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
 [0;36m78 |[0;0m         func checkIsolated() {}
 [0;36m79 |[0;0m
/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift:105:41: [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
[0;36m103 |[0;0m     }
[0;36m104 |[0;0m
[0;36m105 |[0;0m     public static var mainExecutor: any [4;39mMainExecutor[0;0m {
    [0;36m|[0;0m                                         `- [1;31merror: [1;39mcannot find type 'MainExecutor' in scope[0;0m
[0;36m106 |[0;0m         CurrentThread()
[0;36m107 |[0;0m     }
Failed frontend command:
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JSRemote.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JSSending.swift -primary-file /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+ExecutorFactory.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop+LegacyHooks.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JavaScriptEventLoop.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/JobQueue.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/WebWorkerDedicatedExecutor.swift /Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/JavaScriptEventLoop/WebWorkerTaskExecutor.swift -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.dia -target arm64-apple-macos13.0 -module-can-import-version Synchronization 6.4.0.31 0 -disable-cross-import-overlay-search -load-resolved-plugin \#/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/BridgeJSMacros\#BridgeJSMacros -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/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop-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 -suppress-warnings -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -load-plugin-executable /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/BridgeJSMacros\#BridgeJSMacros -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -user-module-version 0.56.1 -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/checkouts/JavaScriptKit/Sources/_CJavaScriptEventLoop/include/module.modulemap -Xcc -fmodule-map-file\=/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/_CJavaScriptKit/include/module.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/JavaScriptKit/Sources/_CJavaScriptEventLoop/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/checkouts/JavaScriptKit/Sources/_CJavaScriptKit/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/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name JavaScriptEventLoop -package-name javascriptkit -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop_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 /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -parse-as-library -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.o -debug-module-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop.swiftmodule -index-unit-output-path /JavaScriptKit.build/Debug/JavaScriptEventLoop-t.build/Objects-normal/arm64/JavaScriptEventLoop+ExecutorFactory.o -index-store-path /Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm