Swift Package IndexBuild Information
Failed to build MCP, reference v2.1.2 (ff6b02), with Swift 6.3 for Wasm on 23 Oct 2026 19:27:43 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-54344849-1":/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-6.3-latest swift build --swift-sdk swift-6.3.2-RELEASE_wasm 2>&1Build Log
========================================
RunAll
========================================
Builder version: 5.1.3
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/tannerdsilva/swift-mcp.git
Reference: v2.1.2
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/tannerdsilva/swift-mcp
* tag v2.1.2 -> FETCH_HEAD
HEAD is now at ff6b02e fix(client): the shutdown ladder follows the child's placement
Cloned https://github.com/tannerdsilva/swift-mcp.git
Revision (git rev-parse @):
ff6b02e2f44071a72352e7664033f2b2183fef8f
SUCCESS checkout https://github.com/tannerdsilva/swift-mcp.git at v2.1.2
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/tannerdsilva/swift-mcp.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344849-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3.2-RELEASE_wasm 2>&1
wasm-6.3-latest: Pulling from saguaro1/spi-images
Digest: sha256:eea66feda95ad8894091082dbcb77ec1fc917891d37888fd1938b0b68455d992
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.3-latest
Fetching https://github.com/tannerdsilva/QuickJSON.git
Fetching https://github.com/apple/swift-docc-plugin.git
Fetching https://github.com/swift-server/swift-service-lifecycle.git
Fetching https://github.com/tannerdsilva/SwiftSlash.git
Fetching https://github.com/apple/swift-argument-parser.git
Fetching https://github.com/swiftlang/swift-syntax.git
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[2/2879] Fetching swift-docc-plugin, quickjson
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[4963/10037] Fetching swift-docc-plugin, quickjson, swiftslash, swift-service-lifecycle
[7562/29308] Fetching swift-docc-plugin, quickjson, swiftslash, swift-service-lifecycle, swift-argument-parser
Fetched https://github.com/tannerdsilva/QuickJSON.git from cache (0.69s)
Fetching https://github.com/apple/swift-log.git
Fetched https://github.com/apple/swift-docc-plugin.git from cache (0.69s)
Fetching https://github.com/apple/swift-nio.git
[1/8373] Fetching swift-log
Fetched https://github.com/apple/swift-log.git from cache (0.53s)
[1/81056] Fetching swift-syntax
[27561/167699] Fetching swift-syntax, swift-nio
Fetched https://github.com/swift-server/swift-service-lifecycle.git from cache (4.89s)
Fetched https://github.com/tannerdsilva/SwiftSlash.git from cache (4.89s)
Fetched https://github.com/apple/swift-argument-parser.git from cache (4.90s)
Fetched https://github.com/swiftlang/swift-syntax.git from cache (4.92s)
Fetched https://github.com/apple/swift-nio.git from cache (4.56s)
Computing version for https://github.com/tannerdsilva/SwiftSlash.git
Computed https://github.com/tannerdsilva/SwiftSlash.git at 6.0.0 (5.41s)
Computing version for https://github.com/tannerdsilva/QuickJSON.git
Computed https://github.com/tannerdsilva/QuickJSON.git at 2.0.3 (0.13s)
Fetching https://github.com/ibireme/yyjson.git
[1/5194] Fetching yyjson
Fetched https://github.com/ibireme/yyjson.git from cache (0.79s)
Computing version for https://github.com/swiftlang/swift-syntax.git
Computed https://github.com/swiftlang/swift-syntax.git at 603.0.2 (1.77s)
Computing version for https://github.com/ibireme/yyjson.git
Computed https://github.com/ibireme/yyjson.git at 0.12.0 (0.16s)
Computing version for https://github.com/apple/swift-argument-parser.git
Computed https://github.com/apple/swift-argument-parser.git at 1.8.2 (0.14s)
Computing version for https://github.com/apple/swift-docc-plugin.git
Computed https://github.com/apple/swift-docc-plugin.git at 1.5.0 (0.16s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3847] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.53s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (0.73s)
Computing version for https://github.com/swift-server/swift-service-lifecycle.git
Computed https://github.com/swift-server/swift-service-lifecycle.git at 2.13.0 (0.13s)
Fetching https://github.com/apple/swift-async-algorithms.git
[1/6821] Fetching swift-async-algorithms
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Computing version for https://github.com/apple/swift-async-algorithms.git
Computed https://github.com/apple/swift-async-algorithms.git at 1.1.7 (0.73s)
Fetching https://github.com/apple/swift-collections.git
[1/29301] Fetching swift-collections
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Computing version for https://github.com/apple/swift-collections.git
Computed https://github.com/apple/swift-collections.git at 1.7.4 (1.64s)
Computing version for https://github.com/apple/swift-log.git
Computed https://github.com/apple/swift-log.git at 1.16.2 (0.15s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 2.104.0 (0.26s)
Fetching https://github.com/apple/swift-atomics.git
Fetching https://github.com/apple/swift-system.git
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Fetched https://github.com/apple/swift-atomics.git from cache (0.69s)
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Computing version for https://github.com/apple/swift-atomics.git
Computed https://github.com/apple/swift-atomics.git at 1.3.1 (0.85s)
Computing version for https://github.com/apple/swift-system.git
Computed https://github.com/apple/swift-system.git at 1.8.1 (0.17s)
Creating working copy for https://github.com/apple/swift-argument-parser.git
Working copy of https://github.com/apple/swift-argument-parser.git resolved at 1.8.2
Creating working copy for https://github.com/ibireme/yyjson.git
Working copy of https://github.com/ibireme/yyjson.git resolved at 0.12.0
Creating working copy for https://github.com/apple/swift-atomics.git
Working copy of https://github.com/apple/swift-atomics.git resolved at 1.3.1
Creating working copy for https://github.com/apple/swift-async-algorithms.git
Working copy of https://github.com/apple/swift-async-algorithms.git resolved at 1.1.7
Creating working copy for https://github.com/tannerdsilva/QuickJSON.git
Working copy of https://github.com/tannerdsilva/QuickJSON.git resolved at 2.0.3
Creating working copy for https://github.com/apple/swift-log.git
Working copy of https://github.com/apple/swift-log.git resolved at 1.16.2
Creating working copy for https://github.com/tannerdsilva/SwiftSlash.git
Working copy of https://github.com/tannerdsilva/SwiftSlash.git resolved at 6.0.0
Creating working copy for https://github.com/swiftlang/swift-syntax.git
Working copy of https://github.com/swiftlang/swift-syntax.git resolved at 603.0.2
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
Creating working copy for https://github.com/apple/swift-nio.git
Working copy of https://github.com/apple/swift-nio.git resolved at 2.104.0
Creating working copy for https://github.com/swift-server/swift-service-lifecycle.git
Working copy of https://github.com/swift-server/swift-service-lifecycle.git resolved at 2.13.0
Creating working copy for https://github.com/apple/swift-docc-plugin.git
Working copy of https://github.com/apple/swift-docc-plugin.git resolved at 1.5.0
Creating working copy for https://github.com/apple/swift-collections.git
Working copy of https://github.com/apple/swift-collections.git resolved at 1.7.4
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
Downloading package prebuilt https://download.swift.org/prebuilts/swift-syntax/603.0.2/swift-6.3.2-RELEASE-ubuntu_noble_x86_64-MacroSupport.tar.gz
Downloaded https://download.swift.org/prebuilts/swift-syntax/603.0.2/swift-6.3.2-RELEASE-ubuntu_noble_x86_64-MacroSupport.tar.gz (0.18s)
[1/1] Compiling plugin GenerateManual
[2/2] Compiling plugin GenerateDoccReference
[3/3] Compiling plugin Swift-DocC Preview
[4/4] Compiling plugin Swift-DocC
Building for debugging...
[4/198] Write sources
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[55/198] Compiling CNIOWindows WSAStartup.c
[55/198] Compiling CNIOWindows shim.c
[57/198] Compiling CNIOWASI CNIOWASI.c
[58/198] Compiling CNIOOpenBSD shim.c
[58/198] Compiling CNIOPosix event_loop_id.c
[60/198] Write swift-version-24593BA9C3E375BF.txt
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[64/198] Compiling CNIOLLHTTP c_nio_http.c
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[66/202] Compiling CNIOLLHTTP c_nio_api.c
[68/208] Emitting module SwiftSyntax603
[69/212] Emitting module SwiftSyntax601
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[70/212] Compiling CNIOLLHTTP c_nio_llhttp.c
[71/214] Compiling yyjson.c
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[145/343] Write sources
[150/364] Emitting module InternalCollectionsUtilities
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[153/364] Compiling Atomics AtomicStorage.swift
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[156/366] Compiling Atomics UnsafeAtomicLazyReference.swift
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[168/367] Compiling Atomics OptionalRawRepresentable.swift
[169/367] Compiling Atomics RawRepresentable.swift
[170/367] Compiling Atomics AtomicBool.swift
[173/371] Emitting module SpanPreview
[174/371] Compiling SpanPreview OutputSpan+InputSpanHelpers.swift
[175/371] Compiling SpanPreview MutableSpan+InputSpanHelpers.swift
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[183/372] Compiling Atomics AtomicInteger.swift
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[185/372] Compiling Atomics AtomicReference.swift
[186/372] Compiling Atomics AtomicMemoryOrderings.swift
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[192/452] Compiling OrderedCollections _HashTable.swift
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[222/460] Compiling c-nioatomics.c
[234/494] Compiling DequeModule Deque+Extras.swift
[235/494] Compiling DequeModule Deque+Hashable.swift
[236/499] Emitting module QuickJSON
[237/502] Compiling DequeModule Deque+CustomReflectable.swift
[238/502] Compiling DequeModule Deque+Descriptions.swift
[239/502] Compiling DequeModule Deque+Testing.swift
[240/502] Compiling DequeModule Deque._Storage.swift
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[253/502] Compiling DequeModule RigidDeque+ContainerOperations.swift
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[256/502] Compiling DequeModule UniqueDeque+Insertions.swift
[257/502] Compiling QuickJSON UnkeyedEncoder.swift
[258/503] Compiling c-atomics.c
[259/503] Compiling __cswiftslash_types __cswiftslash_types.c
[261/503] Compiling DequeModule UniqueDeque+Consumption.swift
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[265/503] Compiling DequeModule UniqueDeque+Equatable.swift
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[267/517] Emitting module SwiftSlashOneShotLatch
[268/517] Compiling SwiftSlashOneShotLatch OneShotLatch.swift
[270/518] Emitting module Atomics
[275/518] Compiling DequeModule RigidDeque+Insertions.swift
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[277/518] Compiling DequeModule UniqueDeque+Iterable.swift
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[285/518] Compiling DequeModule UniqueDeque+Append.swift
[286/518] Compiling DequeModule UniqueDeque+Replacements.swift
[287/518] Compiling DequeModule UniqueDeque.swift
[288/518] Compiling DequeModule _DequeSlot.swift
[289/518] Compiling DequeModule _UnsafeDequeHandle.swift
[290/518] Compiling DequeModule _UnsafeDequeSegments.swift
[291/518] Compiling OrderedCollections OrderedSet+Partial RangeReplaceableCollection.swift
[292/518] Compiling OrderedCollections OrderedSet+Partial SetAlgebra formIntersection.swift
[292/518] Compiling __cswiftslash_threads __cswiftslash_threads.c
[299/518] Compiling NIOConcurrencyHelpers NIOLockedValueBox.swift
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[317/520] Compiling DequeModule Deque.swift
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[327/520] Compiling OrderedCollections OrderedSet.swift
[328/520] Compiling OrderedCollections _UnsafeBitset.swift
[329/520] Compiling NIOConcurrencyHelpers lock.swift
[330/520] Compiling NIOConcurrencyHelpers NIOThreadPoolWorkAvailable.swift
[331/520] Compiling NIOConcurrencyHelpers atomics.swift
[337/520] Emitting module NIOConcurrencyHelpers
[346/522] Compiling SwiftSlashFuture Future.swift
[347/522] Emitting module OrderedCollections
[348/522] Emitting module SwiftSlashFuture
In file included from /host/spi-builder-workspace/.build/checkouts/SwiftSlash/Sources/__cswiftslash_posix_helpers/__cswiftslash_posix_helpers.c:16:
In file included from /host/spi-builder-workspace/.build/checkouts/SwiftSlash/Sources/__cswiftslash_posix_helpers/__cswiftslash_posix_helpers.h:27:
/root/.swiftpm/swift-sdks/swift-6.3.2-RELEASE_wasm.artifactbundle/swift-6.3.2-RELEASE_wasm/wasm32-unknown-wasip1/WASI.sdk/include/wasm32-wasip1/signal.h:2:2: error: "wasm lacks signal support; to enable minimal signal emulation, compile with -D_WASI_EMULATED_SIGNAL and link with -lwasi-emulated-signal"
2 | #error "wasm lacks signal support; to enable minimal signal emulation, \
| ^
/host/spi-builder-workspace/.build/checkouts/SwiftSlash/Sources/__cswiftslash_posix_helpers/__cswiftslash_posix_helpers.c:19:10: fatal error: 'spawn.h' file not found
19 | #include <spawn.h>
| ^~~~~~~~~
2 errors generated.
[356/528] Compiling __cswiftslash_posix_helpers __cswiftslash_posix_helpers.c
[356/528] Compiling yyjson.c
BUILD FAILURE 6.3 wasm