Swift Package IndexBuild Information
Failed to build modbus2mqtt, reference 2.9.1 (ba1e83), with Swift 6.4 for Wasm on 18 Oct 2026 00:29:28 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-53886768-0":/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-6.4.0-RELEASE_wasm 2>&1Build Log
========================================
RunAll
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Builder version: 5.1.3
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Reference: 2.9.1
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/jollyjinx/modbus-2-mqtt-bridge
* tag 2.9.1 -> FETCH_HEAD
HEAD is now at ba1e831 Apply scaling factors to float MQTT values
Cloned https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Revision (git rev-parse @):
ba1e831f33a423122726643b22a46e439297efaf
SUCCESS checkout https://github.com/jollyjinx/modbus-2-mqtt-bridge.git at 2.9.1
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.4
Building package at path: $PWD
https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-53886768-0":/host -w "$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-6.4.0-RELEASE_wasm 2>&1
wasm-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:7a2e5502d3bb6640f9b2bbb1dadf9967024364ce9ed0ed0bd80cf1b699d193fd
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest
Fetching https://github.com/jollyjinx/mqtt-nio.git
[1/2859] Fetching mqtt-nio
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Fetching https://github.com/apple/swift-configuration.git
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Fetched https://github.com/apple/swift-nio-transport-services.git (0.45s)
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Fetching https://github.com/jollyjinx/JLog
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Fetching https://github.com/apple/swift-log.git
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Fetched https://github.com/apple/swift-log.git (0.57s)
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Fetched https://github.com/apple/swift-nio-ssl.git (1.43s)
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Fetched https://github.com/apple/swift-argument-parser (1.02s)
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Fetched https://github.com/apple/swift-nio.git (4.15s)
Computing version for https://github.com/jollyjinx/SwiftLibModbus
Computed https://github.com/jollyjinx/SwiftLibModbus at 3.1.0 (4.33s)
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Computed https://github.com/jollyjinx/JLog at 0.0.9 (0.16s)
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Computing version for https://github.com/Adorkable/swift-log-format-and-pipe
Computed https://github.com/Adorkable/swift-log-format-and-pipe at 0.1.1 (1.32s)
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Computed https://github.com/apple/swift-nio-transport-services.git at 1.28.0 (0.15s)
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Computed https://github.com/apple/swift-configuration.git at 1.2.2 (1.27s)
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Computed https://github.com/apple/swift-atomics.git at 1.3.1 (0.15s)
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Computed https://github.com/apple/swift-argument-parser at 1.8.2 (0.16s)
Computing version for https://github.com/apple/swift-nio-ssl.git
Computed https://github.com/apple/swift-nio-ssl.git at 2.37.5 (0.20s)
Computing version for https://github.com/apple/swift-nio.git
Computed https://github.com/apple/swift-nio.git at 2.104.0 (0.30s)
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Computed https://github.com/swift-server/swift-service-lifecycle at 2.13.0 (0.15s)
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Computed https://github.com/apple/swift-async-algorithms.git at 1.1.7 (0.69s)
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Computed https://github.com/apple/swift-collections at 1.7.3 (0.22s)
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Computed https://github.com/apple/swift-http-types.git at 1.8.0 (0.16s)
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Computed https://github.com/apple/swift-system at 1.8.1 (0.16s)
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Computed https://github.com/apple/swift-nio-extras.git at 1.35.1 (0.42s)
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Computed https://github.com/apple/swift-asn1.git at 1.7.3 (0.18s)
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Computed https://github.com/apple/swift-nio-http2.git at 1.46.0 (0.15s)
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Working copy of https://github.com/apple/swift-crypto.git resolved at 5.0.1
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Working copy of https://github.com/jollyjinx/JLog resolved at 0.0.9
Creating working copy for https://github.com/jollyjinx/SwiftLibModbus
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Working copy of https://github.com/apple/swift-algorithms.git resolved at 1.2.1
Creating working copy for https://github.com/apple/swift-certificates.git
Working copy of https://github.com/apple/swift-certificates.git resolved at 1.21.0
Creating working copy for https://github.com/Adorkable/swift-log-format-and-pipe
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Working copy of https://github.com/apple/swift-nio.git resolved at 2.104.0
Creating working copy for https://github.com/jollyjinx/mqtt-nio.git
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Building for debugging...
[Computing dependencies]
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error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line: cd /host
/host/spi-builder-workspace/.build/checkouts/SwiftLibModbus/Sources/SwiftLibModbus/ModbusDevice.swift:6:8: [1;31merror: [1;39mno such module 'Dispatch'[0;0m
[0;36m4 |[0;0m
[0;36m5 |[0;0m import CModbus
[0;36m6 |[0;0m import Dispatch
[0;36m|[0;0m `- [1;31merror: [1;39mno such module 'Dispatch'[0;0m
[0;36m7 |[0;0m import Foundation
[0;36m8 |[0;0m
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/.build/checkouts/SwiftLibModbus/Sources/SwiftLibModbus/ModbusDevice.swift -target wasm32-unknown-wasip1 -disable-objc-interop -sdk /root/.swiftpm/swift-sdks/swift-6.4.0-RELEASE_wasm.artifactbundle/swift-6.4.0-RELEASE_wasm/wasm32-unknown-wasip1/WASI.sdk -sysroot /root/.swiftpm/swift-sdks/swift-6.4.0-RELEASE_wasm.artifactbundle/swift-6.4.0-RELEASE_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 -suppress-warnings -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature StrictConcurrency -enable-experimental-feature DebugDescriptionMacro -empty-abi-descriptor -external-plugin-path /usr/lib/swift/host/plugins/testing\#/usr/bin/swift-plugin-server -user-module-version 3.1.0 -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-6.4.0-RELEASE_wasm.artifactbundle/swift-6.4.0-RELEASE_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-6.4.0-RELEASE_wasm.artifactbundle/swift-6.4.0-RELEASE_wasm/wasm32-unknown-wasip1/swift.xctoolchain/usr/lib/swift_static/clang -Xcc -fmodule-map-file\=/host/spi-builder-workspace/.build/out/Intermediates.noindex/GeneratedModuleMaps-webassembly-wasm32/CModbus.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/SwiftLibModbus/Sources/CModbus/include -Xcc -I/host/spi-builder-workspace/.build/out/Products/Debug-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name SwiftLibModbus -package-name swiftlibmodbus -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/SwiftLibModbus_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/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/Modules/SwiftLibModbus.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/Modules/SwiftLibModbus.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/SwiftLibModbus-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/SwiftLibModbus-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/SwiftLibModbus-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/SwiftLibModbus-t.build/Objects-normal/wasm32/Modules/SwiftLibModbus.swiftmodule
error: Build failed
BUILD FAILURE 6.4 wasm