Swift Package IndexBuild Information
Failed to build modbus2mqtt, reference main (287341), with Swift 6.3 for Wasm on 30 Sep 2026 23:14:17 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-54344845-0":/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-6.3-latest swift build --swift-sdk swift-6.3.2-RELEASE_wasm 2>&1Build Log
========================================
RunAll
========================================
Builder version: 5.1.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/jollyjinx/modbus-2-mqtt-bridge.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/jollyjinx/modbus-2-mqtt-bridge
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 287341d Correct NIBE S2125 register definitions and metadata
Cloned https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Revision (git rev-parse @):
287341deb79b5027ff533e4275cdc7e506bc743e
SUCCESS checkout https://github.com/jollyjinx/modbus-2-mqtt-bridge.git at main
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344845-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.3-latest swift build --swift-sdk swift-6.3.2-RELEASE_wasm 2>&1
wasm-6.3-latest: Pulling from saguaro1/spi-images
Digest: sha256:253aad7f5b11d25cf9eaef34120b94cd8a325782929c57fb304a7711494a3f9a
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.3-latest
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Computing version for https://github.com/jollyjinx/SwiftLibModbus
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Working copy of https://github.com/apple/swift-nio-transport-services.git resolved at 1.28.0
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Working copy of https://github.com/apple/swift-async-algorithms.git resolved at 1.1.7
Creating working copy for https://github.com/jollyjinx/mqtt-nio.git
Working copy of https://github.com/jollyjinx/mqtt-nio.git resolved at main (0d32051)
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Working copy of https://github.com/jollyjinx/JLog resolved at 0.0.9
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Working copy of https://github.com/apple/swift-log.git resolved at 1.15.1
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Working copy of https://github.com/apple/swift-collections resolved at 1.7.1
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Working copy of https://github.com/apple/swift-nio.git resolved at 2.103.0
Creating working copy for https://github.com/apple/swift-asn1.git
Working copy of https://github.com/apple/swift-asn1.git resolved at 1.7.3
Creating working copy for https://github.com/jollyjinx/SwiftLibModbus
Working copy of https://github.com/jollyjinx/SwiftLibModbus resolved at 3.1.0
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Working copy of https://github.com/apple/swift-atomics.git resolved at 1.3.1
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[1/1] Compiling plugin GenerateManual
[2/2] Compiling plugin GenerateDoccReference
Building for debugging...
[2/86] Copying DeviceDefinitions
[3/86] Write sources
[29/86] Write swift-version-24593BA9C3E375BF.txt
[30/86] Compiling CSystem shims.c
[31/86] Compiling CModbus strlcpy.c
[32/86] Compiling _AtomicsShims.c
[32/86] Compiling CNIOWindows shim.c
[34/86] Compiling CNIOWindows WSAStartup.c
[35/86] Compiling CNIOWASI CNIOWASI.c
[36/114] Compiling CNIOSHA1 c_nio_sha1.c
[37/114] Compiling CModbus modbus.c
[38/130] Compiling CNIOOpenBSD shim.c
[39/139] Compiling CNIOLinux shim.c
[40/151] Compiling CNIOPosix event_loop_id.c
[41/169] Compiling CNIOLinux liburing_shims.c
[42/178] Compiling CNIOLLHTTP c_nio_http.c
[43/178] Compiling CNIOLLHTTP c_nio_api.c
[44/178] Compiling CNIOFreeBSD shim.c
[45/178] Compiling CNIODarwin shim.c
[47/178] Emitting module InternalCollectionsUtilities
[48/181] Emitting module SystemPackage
[48/186] Compiling CNIOLLHTTP c_nio_llhttp.c
[49/186] Compiling c-nioatomics.c
In file included from /host/spi-builder-workspace/.build/checkouts/SwiftLibModbus/Sources/CModbus/modbus-tcp.c:28:
/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/SwiftLibModbus/Sources/CModbus/modbus-tcp.c:55:11: fatal error: 'netdb.h' file not found
55 | # include <netdb.h>
| ^~~~~~~~~
2 errors generated.
[50/186] Compiling CModbus modbus-tcp.c
[50/186] Compiling c-atomics.c
[51/186] Emitting module _NIODataStructures
BUILD FAILURE 6.3 wasm