Swift Package IndexBuild Information
Failed to build modbus2mqtt, reference main (ba1e83), with Swift 6.3 for Wasm on 18 Oct 2026 00:29:18 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-53886769-0":/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: 5.1.3
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 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 main
========================================
Build
========================================
Selected platform: wasm
Swift version: 6.3
Building package at path: $PWD
https://github.com/jollyjinx/modbus-2-mqtt-bridge.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-53886769-0":/host -w "$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: sha256:11aa8e4a9dbcd813ae44128d01e945c51d260b4dfda77b6bb7d997d0cc236164
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.3-latest
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Working copy of https://github.com/apple/swift-nio.git resolved at 2.104.0
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[1/1] Compiling plugin GenerateManual
[2/2] Compiling plugin GenerateDoccReference
Building for debugging...
[2/86] Write sources
[6/86] Copying DeviceDefinitions
[7/86] Write sources
[25/86] Compiling _AtomicsShims.c
[26/86] Write sources
[30/86] Compiling CNIOWindows shim.c
[31/86] Compiling CNIOWindows WSAStartup.c
[32/86] Compiling CNIOWASI CNIOWASI.c
[33/86] Compiling CNIOPosix event_loop_id.c
[34/86] Compiling CSystem shims.c
[35/86] Compiling CNIOOpenBSD shim.c
[36/86] Compiling CNIOLinux shim.c
[37/86] Compiling CNIOLinux liburing_shims.c
[38/86] Compiling CNIOSHA1 c_nio_sha1.c
[39/86] Compiling CNIODarwin shim.c
[39/86] Compiling CNIOFreeBSD shim.c
[40/86] Compiling CNIOLLHTTP c_nio_http.c
[42/86] Compiling CModbus strlcpy.c
[43/86] Compiling CNIOLLHTTP c_nio_api.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.
[44/86] Compiling CModbus modbus-tcp.c
[44/86] Compiling CModbus modbus-data.c
[44/86] Compiling CModbus modbus.c
[44/86] Compiling CModbus modbus-rtu.c
[44/86] Compiling CNIOLLHTTP c_nio_llhttp.c
[44/86] Compiling c-atomics.c
[44/86] Compiling c-nioatomics.c
[44/86] Write swift-version-24593BA9C3E375BF.txt
BUILD FAILURE 6.3 wasm