Swift Package Index

Build Information

Failed to build SwiftyModbus, reference 2.2.1 (444406), with Swift 6.4 for Wasm on 19 Sep 2026 09:21:20 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344844-0":/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/DimaRU/SwiftyModbus.git
Reference: 2.2.1
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/DimaRU/SwiftyModbus
 * tag               2.2.1      -> FETCH_HEAD
HEAD is now at 444406b Fix Package definition file errors for Xcode 15/Swift 5.9
Cloned https://github.com/DimaRU/SwiftyModbus.git
Revision (git rev-parse @):
444406bf0d43bf325073e892256c963e5bf77441
SUCCESS checkout https://github.com/DimaRU/SwiftyModbus.git at 2.2.1
========================================
Build
========================================
Selected platform:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/DimaRU/SwiftyModbus.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344844-0":/host -w "$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/mxcl/PromiseKit.git
[1/17244] Fetching promisekit
Fetched https://github.com/mxcl/PromiseKit.git (1.79s)
Computing version for https://github.com/mxcl/PromiseKit.git
Computed https://github.com/mxcl/PromiseKit.git at 6.22.1 (2.01s)
Creating working copy for https://github.com/mxcl/PromiseKit.git
Working copy of https://github.com/mxcl/PromiseKit.git resolved at 6.22.1
warning: 'spi-builder-workspace': you may be able to install libmodbus using your system-packager:
    apt-get install libmodbus-dev
Building for debugging...
[Pre-planning 1 / 155]
error: SwiftCompile normal wasm32 failed with a nonzero exit code. Command line:     cd /host

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "libmodbus.h"
  |          `- note: in file included from <module-includes>:1:
2 |
/host/spi-builder-workspace/Sources/Libmodbus/libmodbus.h:1:9: error: 'modbus.h' file not found
1 | #import <modbus.h>
  |         `- error: 'modbus.h' file not found
2 |
/host/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbus.swift:9:8: error: could not build C module 'CModbus'
  7 |
  8 | import Foundation
  9 | import CModbus
    |        `- error: could not build C module 'CModbus'
 10 |
 11 | fileprivate let errorValue: Int32 = -1
Failed frontend command:
/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbus.swift /host/spi-builder-workspace/Sources/SwiftyModbus/SwiftyModbusResult.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 5 -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/Sources/Libmodbus/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/out/Products/Debug-webassembly-wasm32/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/DerivedSources-normal/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/DerivedSources/wasm32 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name SwiftyModbus -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/SwiftyModbus_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/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/Modules/SwiftyModbus.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/Modules/SwiftyModbus.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/SwiftyModbus-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/SwiftyModbus-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/SwiftyModbus-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftyModbus.build/Debug-webassembly-wasm32/SwiftyModbus-t.build/Objects-normal/wasm32/Modules/SwiftyModbus.swiftmodule
[39 / 65] PromiseKit
error: Build failed
BUILD FAILURE 6.4 wasm