Swift Package Index

Build Information

Failed to build SwiftGrad, reference 0.3.1 (f384c0), with Swift 6.4 for Linux on 24 Sep 2026 10:55:45 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/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:basic-6.4-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/SwiftAutograd/SwiftGrad.git
Reference: 0.3.1
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/SwiftAutograd/SwiftGrad
 * tag               0.3.1      -> FETCH_HEAD
HEAD is now at f384c05 Fix CI: downgrade swift-tools-version from 6.2 to 6.0
Cloned https://github.com/SwiftAutograd/SwiftGrad.git
Revision (git rev-parse @):
f384c05355dca7f5228ce686bf9e8a046de3339e
SUCCESS checkout https://github.com/SwiftAutograd/SwiftGrad.git at 0.3.1
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.4
Building package at path:  $PWD
https://github.com/SwiftAutograd/SwiftGrad.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:basic-6.4-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:c77fcce225e223ac0fafed844619173fc6de8d62dd560eeb28db3182af6a282b
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:basic-6.4-latest
Building for debugging...
[Planning deferred tasks]
[24 / 32] SwiftGrad
[29 / 32] SwiftGrad
error: SwiftCompile normal x86_64 /host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift failed with a nonzero exit code. Command line:     cd /host
    builtin-SwiftPerFileCompile Engine.swift
/host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift:77:17: error: cannot find 'Darwin' in scope
 75 |     /// Tanh activation
 76 |     public func tanh() -> Value {
 77 |         let t = Darwin.tanh(data)
    |                 `- error: cannot find 'Darwin' in scope
 78 |         let out = Value(t, children: [self], op: "tanh")
 79 |         out._backward = { [weak self, weak out] in
/host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift:89:25: error: cannot find 'Darwin' in scope
 87 |     public func log() -> Value {
 88 |         let base = data
 89 |         let out = Value(Darwin.log(data), children: [self], op: "log")
    |                         `- error: cannot find 'Darwin' in scope
 90 |         out._backward = { [weak self, weak out] in
 91 |             guard let self, let out else { return }
/host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift:99:17: error: cannot find 'Darwin' in scope
 97 |     /// Exponential: e^self
 98 |     public func exp() -> Value {
 99 |         let e = Darwin.exp(data)
    |                 `- error: cannot find 'Darwin' in scope
100 |         let out = Value(e, children: [self], op: "exp")
101 |         out._backward = { [weak self, weak out] in
Failed frontend command:
/usr/bin/swift-frontend -frontend -c -primary-file /host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift /host/spi-builder-workspace/Sources/SwiftGrad/Losses.swift /host/spi-builder-workspace/Sources/SwiftGrad/NN.swift /host/spi-builder-workspace/Sources/SwiftGrad/SwiftGrad.swift -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.d -emit-const-values-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.swiftconstvalues -emit-reference-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.swiftdeps -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.dia -target x86_64-unknown-linux-gnu -disable-objc-interop -I /host/spi-builder-workspace/.build/out/Products/Debug-linux-x86_64 -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 6 -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 -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -fno-omit-frame-pointer -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-linux-x86_64/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/DerivedSources-normal/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/DerivedSources/x86_64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name SwiftGrad -package-name spi_builder_workspace -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/SwiftGrad_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 -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.o -index-unit-output-path /SwiftGrad.build/Debug-linux-x86_64/SwiftGrad-t.build/Objects-normal/x86_64/Engine.o -index-store-path /host/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 linux