Swift Package IndexBuild Information
Failed to build mcp-stdio-swift, reference main (1a5e0b), with Swift 6.3 for macOS (SPM) on 18 Apr 2026 03:44:45 UTC.
Build Command
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64Build Log
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/xbill9/mcp-stdio-swift.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/xbill9/mcp-stdio-swift
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 1a5e0bc add settings.json for gemini cli
Cloned https://github.com/xbill9/mcp-stdio-swift.git
Revision (git rev-parse @):
1a5e0bc4601b79bafc196f7e1bd4bca79d0a8227
SUCCESS checkout https://github.com/xbill9/mcp-stdio-swift.git at main
Fetching https://github.com/apple/swift-async-algorithms.git
Fetching https://github.com/modelcontextprotocol/swift-sdk
Fetching https://github.com/mattt/eventsource.git
Fetching https://github.com/swift-server/swift-service-lifecycle.git
Fetching https://github.com/apple/swift-log.git
Fetching https://github.com/apple/swift-collections.git
Fetching https://github.com/apple/swift-system.git
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[2379/48541] Fetching swift-service-lifecycle, eventsource, swift-sdk, swift-collections, swift-async-algorithms, swift-system, swift-log
Fetched https://github.com/apple/swift-system.git from cache (1.22s)
[27621/42940] Fetching swift-service-lifecycle, eventsource, swift-sdk, swift-collections, swift-async-algorithms, swift-log
Fetched https://github.com/mattt/eventsource.git from cache (1.29s)
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Fetched https://github.com/apple/swift-log.git from cache (1.29s)
Fetched https://github.com/apple/swift-async-algorithms.git from cache (1.29s)
Fetched https://github.com/swift-server/swift-service-lifecycle.git from cache (1.29s)
Computing version for https://github.com/apple/swift-log.git
[10135/23569] Fetching swift-collections
Fetched https://github.com/apple/swift-collections.git from cache (1.85s)
Computed https://github.com/apple/swift-log.git at 1.8.0 (1.90s)
Computing version for https://github.com/swift-server/swift-service-lifecycle.git
Computed https://github.com/swift-server/swift-service-lifecycle.git at 2.9.1 (0.59s)
Computing version for https://github.com/modelcontextprotocol/swift-sdk
Computed https://github.com/modelcontextprotocol/swift-sdk at 0.10.2 (0.59s)
Computing version for https://github.com/apple/swift-async-algorithms.git
Computed https://github.com/apple/swift-async-algorithms.git at 1.1.1 (0.64s)
Computing version for https://github.com/mattt/eventsource.git
Computed https://github.com/mattt/eventsource.git at 1.3.0 (0.57s)
Computing version for https://github.com/apple/swift-system.git
Computed https://github.com/apple/swift-system.git at 1.6.3 (0.61s)
Computing version for https://github.com/apple/swift-collections.git
Computed https://github.com/apple/swift-collections.git at 1.3.0 (0.67s)
Creating working copy for https://github.com/mattt/eventsource.git
Working copy of https://github.com/mattt/eventsource.git resolved at 1.3.0
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 2.9.1
Creating working copy for https://github.com/apple/swift-collections.git
Working copy of https://github.com/apple/swift-collections.git resolved at 1.3.0
Creating working copy for https://github.com/apple/swift-log.git
Working copy of https://github.com/apple/swift-log.git resolved at 1.8.0
Creating working copy for https://github.com/apple/swift-system.git
Working copy of https://github.com/apple/swift-system.git resolved at 1.6.3
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 1.1.1
Creating working copy for https://github.com/modelcontextprotocol/swift-sdk
Working copy of https://github.com/modelcontextprotocol/swift-sdk resolved at 0.10.2
========================================
ResolveProductDependencies
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Resolving dependencies ...
{
"identity": ".resolve-product-dependencies",
"name": "resolve-dependencies",
"url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
"traits": [
"default"
],
"dependencies": [
{
"identity": "mcp-stdio-swift",
"name": "mcp-stdio-swift",
"url": "https://github.com/xbill9/mcp-stdio-swift.git",
"version": "unspecified",
"path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/mcp-stdio-swift",
"traits": [
"default"
],
"dependencies": [
]
}
]
}
Fetching https://github.com/xbill9/mcp-stdio-swift.git
[1/27] Fetching mcp-stdio-swift
Fetched https://github.com/xbill9/mcp-stdio-swift.git from cache (0.58s)
Creating working copy for https://github.com/xbill9/mcp-stdio-swift.git
Working copy of https://github.com/xbill9/mcp-stdio-swift.git resolved at main (1a5e0bc)
warning: '.resolve-product-dependencies': dependency 'mcp-stdio-swift' is not used by any target
Found 0 product dependencies
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Build
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Selected platform: macosSpm
Swift version: 6.3
Building package at path: $PWD
https://github.com/xbill9/mcp-stdio-swift.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-26.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/18] Write sources
[7/18] Write mcp-stdio-swift-entitlement.plist
[7/18] Write sources
[13/18] Compiling CSystem shims.c
[14/18] Write swift-version--6988338F2F200930.txt
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[26/76] Emitting module InternalCollectionsUtilities
[27/76] Compiling InternalCollectionsUtilities UnsafeRawBufferPointer+Extras.swift
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[44/155] Emitting module Logging
[45/155] Compiling DequeModule _UnsafeWrappedBuffer.swift
[46/155] Emitting module ConcurrencyHelpers
[47/155] Compiling ConcurrencyHelpers Lock.swift
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[101/161] Compiling Logging MetadataProvider.swift
[102/161] Compiling Logging LogHandler.swift
[103/161] Compiling Logging Locks.swift
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[144/161] Compiling OrderedCollections _UnsafeBitset.swift
[145/161] Compiling UnixSignals UnixSignalsSequence.swift
[146/161] Compiling UnixSignals UnixSignal.swift
[147/161] Emitting module UnixSignals
[154/161] Emitting module OrderedCollections
[155/211] Emitting module AsyncAlgorithms
[156/216] Compiling AsyncAlgorithms AsyncChunksOfCountOrSignalSequence.swift
[157/216] Compiling AsyncAlgorithms AsyncChunksOfCountSequence.swift
[158/216] Compiling AsyncAlgorithms AsyncCompactedSequence.swift
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[203/216] Compiling AsyncAlgorithms MergeStateMachine.swift
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[205/216] Compiling AsyncAlgorithms UnsafeTransfer.swift
[206/216] Compiling AsyncAlgorithms AsyncZip2Sequence.swift
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[208/216] Compiling AsyncAlgorithms ZipStateMachine.swift
[209/216] Compiling AsyncAlgorithms ZipStorage.swift
[210/225] Compiling ServiceLifecycle ServiceRunnerError.swift
[211/225] Compiling EventSource AsyncSequence+Events.swift
[212/225] Compiling EventSource AsyncEventsSequence.swift
[213/225] Compiling EventSource EventSource.swift
[214/225] Emitting module EventSource
[215/244] Compiling ServiceLifecycle Service.swift
[216/244] Compiling ServiceLifecycle ServiceGroupConfiguration.swift
[217/244] Compiling ServiceLifecycle CancellationWaiter.swift
[218/244] Compiling ServiceLifecycle GracefulShutdown.swift
[219/244] Emitting module ServiceLifecycle
[220/244] Compiling ServiceLifecycle ServiceGroup.swift
[221/244] Compiling ServiceLifecycle AsyncCancelOnGracefulShutdownSequence.swift
[222/244] Compiling ServiceLifecycle AsyncGracefulShutdownSequence.swift
[223/244] Compiling MCP Prompts.swift
[224/244] Compiling MCP Resources.swift
[225/244] Compiling MCP Error.swift
[226/244] Compiling MCP ID.swift
[227/244] Compiling MCP Versioning.swift
[228/244] Compiling MCP Client.swift
[229/244] Compiling MCP Transport.swift
[230/244] Compiling MCP HTTPClientTransport.swift
[231/244] Compiling MCP Ping.swift
[232/244] Compiling MCP Value.swift
[233/244] Compiling MCP Lifecycle.swift
[234/244] Compiling MCP Messages.swift
[235/244] Compiling MCP InMemoryTransport.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-sdk/Sources/MCP/Base/Transports/NetworkTransport.swift:581:33: error: sending 'sendContinuationResumed' risks causing data races [#SendingRisksDataRace]
579 |
580 | Task { @MainActor in
581 | if !sendContinuationResumed {
| |- error: sending 'sendContinuationResumed' risks causing data races [#SendingRisksDataRace]
| `- note: task-isolated 'sendContinuationResumed' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
582 | sendContinuationResumed = true
583 | if let error = error {
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-sdk/Sources/MCP/Base/Transports/NetworkTransport.swift:812:29: error: sending 'receiveContinuationResumed' risks causing data races [#SendingRisksDataRace]
810 | content, _, isComplete, error in
811 | Task { @MainActor in
812 | if !receiveContinuationResumed {
| |- error: sending 'receiveContinuationResumed' risks causing data races [#SendingRisksDataRace]
| `- note: task-isolated 'receiveContinuationResumed' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
813 | receiveContinuationResumed = true
814 | if let error = error {
[#SendingRisksDataRace]: <https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race>
[236/244] Compiling MCP NetworkTransport.swift
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-sdk/Sources/MCP/Base/Transports/NetworkTransport.swift:581:33: error: sending 'sendContinuationResumed' risks causing data races [#SendingRisksDataRace]
579 |
580 | Task { @MainActor in
581 | if !sendContinuationResumed {
| |- error: sending 'sendContinuationResumed' risks causing data races [#SendingRisksDataRace]
| `- note: task-isolated 'sendContinuationResumed' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
582 | sendContinuationResumed = true
583 | if let error = error {
/Users/admin/builder/spi-builder-workspace/.build/checkouts/swift-sdk/Sources/MCP/Base/Transports/NetworkTransport.swift:812:29: error: sending 'receiveContinuationResumed' risks causing data races [#SendingRisksDataRace]
810 | content, _, isComplete, error in
811 | Task { @MainActor in
812 | if !receiveContinuationResumed {
| |- error: sending 'receiveContinuationResumed' risks causing data races [#SendingRisksDataRace]
| `- note: task-isolated 'receiveContinuationResumed' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
813 | receiveContinuationResumed = true
814 | if let error = error {
[#SendingRisksDataRace]: <https://docs.swift.org/compiler/documentation/diagnostics/sending-risks-data-race>
[237/244] Compiling MCP StdioTransport.swift
[238/244] Compiling MCP UnitInterval.swift
[239/244] Emitting module MCP
[240/244] Compiling MCP Sampling.swift
[241/244] Compiling MCP Data+Extensions.swift
[242/246] Compiling MCP Server.swift
[243/246] Compiling MCP Tools.swift
BUILD FAILURE 6.3 macosSpm