SwiftGrad – Build Information – Swift Package Index

Build Information

Failed to build SwiftGrad, reference main (55fd4d), with Swift 6.4 for Android on 24 Sep 2026 10:55:47 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344847-0":/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:android-6.4-latest swift build --swift-sdk aarch64-unknown-linux-android28 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/SwiftAutograd/SwiftGrad.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/SwiftAutograd/SwiftGrad
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 55fd4d3 Update snake demo GIF showing episodes 100-300
Cloned https://github.com/SwiftAutograd/SwiftGrad.git
Revision (git rev-parse @):
55fd4d3e2a6799a05650ec54886e735a0be7de4f
SUCCESS checkout https://github.com/SwiftAutograd/SwiftGrad.git at main
========================================
Build
========================================
Selected platform:         android
Swift version:             6.4
Building package at path:  $PWD
https://github.com/SwiftAutograd/SwiftGrad.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344847-0":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:android-6.4-latest swift build --swift-sdk aarch64-unknown-linux-android28 2>&1
android-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:abadcff584c273feba50641b454858d377ba30b35ea7287a94f45ebd8afd0ea0
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:android-6.4-latest
Building for debugging...
[Planning deferred tasks]
[24 / 32] SwiftGrad
[29 / 32] SwiftGrad
error: SwiftCompile normal aarch64 /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: [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
 [0;36m75 |[0;0m     /// Tanh activation
 [0;36m76 |[0;0m     public func tanh() -> Value {
 [0;36m77 |[0;0m         let t = [4;39mDarwin[0;0m.tanh(data)
    [0;36m|[0;0m                 `- [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
 [0;36m78 |[0;0m         let out = Value(t, children: [self], op: "tanh")
 [0;36m79 |[0;0m         out._backward = { [weak self, weak out] in
/host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift:89:25: [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
 [0;36m87 |[0;0m     public func log() -> Value {
 [0;36m88 |[0;0m         let base = data
 [0;36m89 |[0;0m         let out = Value([4;39mDarwin[0;0m.log(data), children: [self], op: "log")
    [0;36m|[0;0m                         `- [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
 [0;36m90 |[0;0m         out._backward = { [weak self, weak out] in
 [0;36m91 |[0;0m             guard let self, let out else { return }
/host/spi-builder-workspace/Sources/SwiftGrad/Engine.swift:99:17: [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
 [0;36m97 |[0;0m     /// Exponential: e^self
 [0;36m98 |[0;0m     public func exp() -> Value {
 [0;36m99 |[0;0m         let e = [4;39mDarwin[0;0m.exp(data)
    [0;36m|[0;0m                 `- [1;31merror: [1;39mcannot find 'Darwin' in scope[0;0m
[0;36m100 |[0;0m         let out = Value(e, children: [self], op: "exp")
[0;36m101 |[0;0m         out._backward = { [weak self, weak out] in
Failed frontend command:
/root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/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-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.d -emit-const-values-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.swiftconstvalues -emit-reference-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.swiftdeps -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.dia -target aarch64-unknown-linux-android28 -Xllvm -aarch64-use-tbi -disable-objc-interop -sdk /android-ndk/android-ndk-r27d/toolchains/llvm/prebuilt/linux-x86_64/sysroot -sysroot /android-ndk/android-ndk-r27d/toolchains/llvm/prebuilt/linux-x86_64/sysroot -I /host/spi-builder-workspace/.build/out/Products/Debug-android-aarch64 -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 /root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/usr/lib/swift/host/plugins/testing\#/root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/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_android.artifactbundle/swift-android/swift-resources/usr/lib/swift-aarch64 -enable-anonymous-context-mangled-names -file-compilation-dir /host -Xcc -resource-dir -Xcc /android-ndk/android-ndk-r27d/toolchains/llvm/prebuilt/linux-x86_64/lib/clang/18 -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-android-aarch64/include -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/DerivedSources-normal/aarch64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/DerivedSources/aarch64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/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-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/SwiftGrad_const_extract_protocols.json -in-process-plugin-server-path /root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/usr/lib/swift/host/libSwiftInProcPluginServer.so -plugin-path /root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/usr/lib/swift/host/plugins -plugin-path /root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/usr/local/lib/swift/host/plugins -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.o -index-unit-output-path /SwiftGrad.build/Debug-android-aarch64/SwiftGrad-t.build/Objects-normal/aarch64/Engine.o -index-store-path /host/spi-builder-workspace/.build/out -index-system-modules
error: Build failed
BUILD FAILURE 6.4 android