Swift Package IndexBuild Information
Failed to build SwiftLibModbus, reference main (5da5e5), with Swift 6.4 for Wasm on 26 Sep 2026 05:45:25 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>&1Build Log
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RunAll
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Builder version: 5.1.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/jollyjinx/SwiftLibModbus.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/SwiftLibModbus
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 5da5e53 Add per-operation Modbus device addressing
Cloned https://github.com/jollyjinx/SwiftLibModbus.git
Revision (git rev-parse @):
5da5e53d39c7f9eeda066ac08964613237572efc
SUCCESS checkout https://github.com/jollyjinx/SwiftLibModbus.git at main
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Build
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Selected platform: wasm
Swift version: 6.4
Building package at path: $PWD
https://github.com/jollyjinx/SwiftLibModbus.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344844-0":/host -w "$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
Building for debugging...
[Pre-planning 1 / 125]
[21 / 36] SwiftLibModbus
In file included from /host/spi-builder-workspace/Sources/CModbus/modbus-rtu.c:38:
[1m/host/spi-builder-workspace/Sources/CModbus/modbus-rtu-private.h:31:10: [0m[0;1;31mfatal error: [0m[1m'termios.h' file not found[0m
31 | #include <termios.h>[0m
| [0;1;32m ^~~~~~~~~~~
[0m1 error generated.
error: CompileC /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-rtu.o /host/spi-builder-workspace/Sources/CModbus/modbus-rtu.c normal wasm32 c com.apple.compilers.llvm.clang.1_0.compiler failed with a nonzero exit code. Command line: cd /host
Using response file: /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp
/usr/bin/clang -x c -target wasm32-unknown-wasip1 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fcolor-diagnostics -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-implicit-fallthrough -fstrict-aliasing -Wdeprecated-declarations -Wno-sign-conversion -Wno-infinite-recursion -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-semicolon-before-method-body --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 @/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp -MMD -MT dependencies -MF /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-rtu.d --serialize-diagnostics /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-rtu.dia -c /host/spi-builder-workspace/Sources/CModbus/modbus-rtu.c -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-rtu.o
In file included from /host/spi-builder-workspace/Sources/CModbus/modbus-tcp.c:28:
[1m/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/include/wasm32-wasip1/signal.h:2:2: [0m[0;1;31merror: [0m[1m"wasm lacks signal support; to enable minimal signal emulation, compile with -D_WASI_EMULATED_SIGNAL and link with -lwasi-emulated-signal"[0m
2 | #error [0;32m"wasm lacks signal support; to enable minimal signal emulation, \[0m
| [0;1;32m ^
[0m[1m/host/spi-builder-workspace/Sources/CModbus/modbus-tcp.c:59:11: [0m[0;1;31mfatal error: [0m[1m'netdb.h' file not found[0m
59 | # include <netdb.h>[0m
| [0;1;32m ^~~~~~~~~
[0m2 errors generated.
error: CompileC /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-tcp.o /host/spi-builder-workspace/Sources/CModbus/modbus-tcp.c normal wasm32 c com.apple.compilers.llvm.clang.1_0.compiler failed with a nonzero exit code. Command line: cd /host
Using response file: /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp
/usr/bin/clang -x c -target wasm32-unknown-wasip1 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fcolor-diagnostics -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-implicit-fallthrough -fstrict-aliasing -Wdeprecated-declarations -Wno-sign-conversion -Wno-infinite-recursion -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-semicolon-before-method-body --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 @/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp -MMD -MT dependencies -MF /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-tcp.d --serialize-diagnostics /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-tcp.dia -c /host/spi-builder-workspace/Sources/CModbus/modbus-tcp.c -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftLibModbus.build/Debug-webassembly-wasm32/CModbus-t.build/Objects-normal/wasm32/modbus-tcp.o
error: Build failed
BUILD FAILURE 6.4 wasm