mcp-swift-sdk – Build Information

Build Information

Failed to build mcp-swift-sdk, reference main (e76d61), with Swift 6.4 for Wasm on 22 Sep 2026 20:08:18 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-53886770-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1

Build Log

========================================
RunAll
========================================
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 /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/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:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/ShenghaiWang/swift-mcp-sdk.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-53886770-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1
wasm-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:4328fdb43c680d205c1d6761b1e3267aa38277eefdda9ddfb17b6a0f1a77857a
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest
Fetching https://github.com/apple/swift-system.git
Fetching https://github.com/apple/swift-log.git
Fetching https://github.com/mattt/eventsource.git
[1/8148] Fetching swift-log
[8149/8451] Fetching swift-log, eventsource
[8331/15367] Fetching swift-log, eventsource, swift-system
Fetched https://github.com/mattt/eventsource.git (0.67s)
Fetched https://github.com/apple/swift-system.git (0.67s)
Fetched https://github.com/apple/swift-log.git (0.67s)
Computing version for https://github.com/mattt/eventsource.git
Computed https://github.com/mattt/eventsource.git at 1.5.1 (0.85s)
Computing version for https://github.com/apple/swift-log.git
Computed https://github.com/apple/swift-log.git at 1.15.1 (0.19s)
Computing version for https://github.com/apple/swift-system.git
Computed https://github.com/apple/swift-system.git at 1.8.1 (0.21s)
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
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
Building for debugging...
[Pre-planning 1 / 156]
[41 / 72] SystemPackage
[53 / 72] SystemPackage
[54 / 72] SystemPackage
[59 / 72] Logging
[61 / 73]
[64 / 83] MCP
[66 / 83] MCP
[66 / 83] SystemPackage
error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line:     cd /host

/host/spi-builder-workspace/Sources/MCP/Base/Transports/HTTPClientTransport.swift:5:12: [1;31merror: [1;39mno such module 'EventSource'[0;0m
  [0;36m3 |[0;0m
  [0;36m4 |[0;0m #if !os(Linux)
  [0;36m5 |[0;0m     import EventSource
    [0;36m|[0;0m            `- [1;31merror: [1;39mno such module 'EventSource'[0;0m
  [0;36m6 |[0;0m #endif
  [0;36m7 |[0;0m
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Sources/MCP/Base/Error.swift /host/spi-builder-workspace/Sources/MCP/Base/ID.swift /host/spi-builder-workspace/Sources/MCP/Base/Lifecycle.swift /host/spi-builder-workspace/Sources/MCP/Base/Messages.swift /host/spi-builder-workspace/Sources/MCP/Base/Transport.swift /host/spi-builder-workspace/Sources/MCP/Base/Transports/HTTPClientTransport.swift /host/spi-builder-workspace/Sources/MCP/Base/Transports/InMemoryTransport.swift /host/spi-builder-workspace/Sources/MCP/Base/Transports/NetworkTransport.swift /host/spi-builder-workspace/Sources/MCP/Base/Transports/StdioTransport.swift /host/spi-builder-workspace/Sources/MCP/Base/UnitInterval.swift /host/spi-builder-workspace/Sources/MCP/Base/Utilities/Ping.swift /host/spi-builder-workspace/Sources/MCP/Base/Value.swift /host/spi-builder-workspace/Sources/MCP/Base/Versioning.swift /host/spi-builder-workspace/Sources/MCP/Client/Client.swift /host/spi-builder-workspace/Sources/MCP/Client/Sampling.swift /host/spi-builder-workspace/Sources/MCP/Extensions/Data+Extensions.swift /host/spi-builder-workspace/Sources/MCP/Server/Prompts.swift /host/spi-builder-workspace/Sources/MCP/Server/Resources.swift /host/spi-builder-workspace/Sources/MCP/Server/Server.swift /host/spi-builder-workspace/Sources/MCP/Server/Tools.swift -target wasm32-unknown-wasip1 -disable-objc-interop -sdk /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -sysroot /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk -I /host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32 -module-cache-path /host/spi-builder-workspace/.build/out/ModuleCache.noindex -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 -external-plugin-path /usr/lib/swift/host/plugins/testing\#/usr/bin/swift-plugin-server -validate-clang-modules-once -clang-build-session-file /host/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /host -resource-dir /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static -use-static-resource-dir -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -resource-dir -Xcc /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static/clang -Xcc -fmodule-map-file\=/host/spi-builder-workspace/.build/checkouts/swift-system/Sources/CSystem/include/module.modulemap -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/host/spi-builder-workspace/.build/checkouts/swift-system/Sources/CSystem/include -Xcc -I/host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/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 /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/MCP_const_extract_protocols.json -in-process-plugin-server-path /usr/lib/swift/host/libSwiftInProcPluginServer.so -plugin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -emit-module-doc-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/Modules/MCP.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/Modules/MCP.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/MCP-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/MCP-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/MCP-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/mcp-swift-sdk.build/Debug-webassembly-wasm32/MCP-t.build/Objects-normal/wasm32/Modules/MCP.swiftmodule
error: Build failed
BUILD FAILURE 6.4 wasm