mcp-swift-sdk – Build Information

Build Information

Failed to build mcp-swift-sdk, reference main (e76d61), with Swift 6.4 for macOS (SPM) on 22 Sep 2026 20:25:03 UTC.

Build Command

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

Build Log

========================================
RunAll
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Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ShenghaiWang/swift-mcp-sdk.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ShenghaiWang/swift-mcp-sdk
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at e76d611 Bump version to 0.10.0
Cloned https://github.com/ShenghaiWang/swift-mcp-sdk.git
Revision (git rev-parse @):
e76d61155bf00482ea8f2ff78fca08a4eece410e
SUCCESS checkout https://github.com/ShenghaiWang/swift-mcp-sdk.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/ShenghaiWang/swift-mcp-sdk.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]
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Fetching https://github.com/mattt/eventsource.git
Fetching https://github.com/apple/swift-log.git
Fetching https://github.com/apple/swift-system.git
[1/303] Fetching eventsource
[129/7219] Fetching eventsource, swift-system
[305/15367] Fetching eventsource, swift-system, swift-log
Fetched https://github.com/apple/swift-system.git (1.56s)
Fetched https://github.com/mattt/eventsource.git (1.56s)
Fetched https://github.com/apple/swift-log.git (1.57s)
Computing version for https://github.com/mattt/eventsource.git
Computed https://github.com/mattt/eventsource.git at 1.5.1 (2.20s)
Computing version for https://github.com/apple/swift-log.git
Computed https://github.com/apple/swift-log.git at 1.15.1 (0.59s)
Computing version for https://github.com/apple/swift-system.git
Computed https://github.com/apple/swift-system.git at 1.8.1 (0.60s)
Creating working copy for https://github.com/apple/swift-system.git
Working copy of https://github.com/apple/swift-system.git resolved at 1.8.1
Creating working copy for https://github.com/mattt/eventsource.git
Working copy of https://github.com/mattt/eventsource.git resolved at 1.5.1
Creating working copy for https://github.com/apple/swift-log.git
Working copy of https://github.com/apple/swift-log.git resolved at 1.15.1
error: SwiftCompile normal arm64 /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift failed with a nonzero exit code. Command line:     cd /Users/admin/builder
    builtin-SwiftPerFileCompile NetworkTransport.swift
/Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift:597:62: [1;33mwarning: [1;39m'weak' ownership of capture 'self' differs from implicitly-captured strong reference in outer scope[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture\ImplicitStrongCapture]8;;\]
[0;36m578 |[0;0m                         guard let self = self else { return }
[0;36m579 |[0;0m
[0;36m580 |[0;0m                         Task { @MainActor in
    [0;36m|[0;0m                              |- [1;39mnote: [1;39m'self' implicitly strongly captured here[0;0m
    [0;36m|[0;0m                              `- [1;39mnote: [1;39madd 'self' as a capture list item to silence[0;0m
[0;36m581 |[0;0m                             if !sendContinuationResumed {
[0;36m582 |[0;0m                                 sendContinuationResumed = true
    [0;36m:[0;0m
[0;36m595 |[0;0m
[0;36m596 |[0;0m                                                 // Schedule connection restart
[0;36m597 |[0;0m                                                 Task { [weak self] in  // Operate on self's executor
    [0;36m|[0;0m                                                              |- [1;33mwarning: [1;39m'weak' ownership of capture 'self' differs from implicitly-captured strong reference in outer scope[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture\ImplicitStrongCapture]8;;\]
    [0;36m|[0;0m                                                              `- [1;39mnote: [1;39mexplicitly assign the capture list item to silence[0;0m
[0;36m598 |[0;0m                                                     guard let self = self else { return }
[0;36m599 |[0;0m
/Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift:581:33: [1;31merror: [1;39msending 'sendContinuationResumed' risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\::]8;;https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race\SendingRisksDataRace]8;;\]
[0;36m579 |[0;0m
[0;36m580 |[0;0m                         Task { @MainActor in
[0;36m581 |[0;0m                             if !sendContinuationResumed {
    [0;36m|[0;0m                                 |- [1;31merror: [1;39msending 'sendContinuationResumed' risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\::]8;;https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race\SendingRisksDataRace]8;;\]
    [0;36m|[0;0m                                 `- [1;39mnote: [1;39mmain actor-isolated closure captures reference to mutable 'sendContinuationResumed' which remains modifiable by code in the current isolation context[0;0m
[0;36m582 |[0;0m                                 sendContinuationResumed = true
[0;36m583 |[0;0m                                 if let error = error {
/Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift:812:29: [1;31merror: [1;39msending 'receiveContinuationResumed' risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\::]8;;https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race\SendingRisksDataRace]8;;\]
[0;36m810 |[0;0m                     content, _, isComplete, error in
[0;36m811 |[0;0m                     Task { @MainActor in
[0;36m812 |[0;0m                         if !receiveContinuationResumed {
    [0;36m|[0;0m                             |- [1;31merror: [1;39msending 'receiveContinuationResumed' risks causing data races[0;0m [#]8;;https://docs.swift.org/compiler/documentation/diagnostics/region-isolation\RegionIsolation]8;;\::]8;;https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race\SendingRisksDataRace]8;;\]
    [0;36m|[0;0m                             `- [1;39mnote: [1;39mmain actor-isolated closure captures reference to mutable 'receiveContinuationResumed' which remains modifiable by code in the current isolation context[0;0m
[0;36m813 |[0;0m                             receiveContinuationResumed = true
[0;36m814 |[0;0m                             if let error = error {
[#ImplicitStrongCapture]: <https://docs.swift.org/compiler/documentation/diagnostics/implicit-strong-capture>
[#RegionIsolation]: <https://docs.swift.org/compiler/documentation/diagnostics/region-isolation>
[#SendingRisksDataRace]: <https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race>
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/Sources/MCP/Base/Error.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/ID.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Lifecycle.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Messages.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transport.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/HTTPClientTransport.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/InMemoryTransport.swift -primary-file /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Transports/StdioTransport.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/UnitInterval.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Utilities/Ping.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Value.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Base/Versioning.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Client/Client.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Client/Sampling.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Extensions/Data+Extensions.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Server/Prompts.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Server/Resources.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Server/Server.swift /Users/admin/builder/spi-builder-workspace/Sources/MCP/Server/Tools.swift -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.dia -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.d -emit-const-values-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.swiftconstvalues -emit-reference-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.swiftdeps -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.dia -target arm64-apple-macos13.0 -module-can-import-version Darwin 428.0.10 0 -module-can-import-version Network 5000.0.33 6681.1.1 -module-can-import-version System 5027.0.67 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/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/MCP-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 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 -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/swift-system/Sources/CSystem/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/swift-system/Sources/CSystem/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/mcp-swift-sdk.build/Debug/MCP-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name MCP -package-name spi_builder_workspace -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/MCP_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/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.o -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.o -debug-module-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/MCP.swiftmodule -index-unit-output-path /mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/InMemoryTransport.o -index-unit-output-path /mcp-swift-sdk.build/Debug/MCP-t.build/Objects-normal/arm64/NetworkTransport.o -index-store-path /Users/admin/builder/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 macosSpm