swift-log-playground – Build Information

Build Information

Failed to build swift-log-playground, reference main (6c4c11), with Swift 6.4 for Android on 29 Sep 2026 02:36:12 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344845-1":/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: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/kkebo/swift-log-playground.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/kkebo/swift-log-playground
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 6c4c116 Merge pull request #61 from kkebo/swift-tools-version-6.1
Cloned https://github.com/kkebo/swift-log-playground.git
Revision (git rev-parse @):
6c4c116232c60938905fe00943a61d0ed4df3c95
SUCCESS checkout https://github.com/kkebo/swift-log-playground.git at main
========================================
Build
========================================
Selected platform:         android
Swift version:             6.4
Building package at path:  $PWD
https://github.com/kkebo/swift-log-playground.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344845-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images: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
Fetching https://github.com/apple/swift-log
[1/8165] Fetching swift-log
Fetched https://github.com/apple/swift-log (1.01s)
Computing version for https://github.com/apple/swift-log
Computed https://github.com/apple/swift-log at 1.7.0 (1.21s)
Creating working copy for https://github.com/apple/swift-log
Working copy of https://github.com/apple/swift-log resolved at 1.7.0
Building for debugging...
[Pre-planning 1 / 96]
error: SwiftCompile normal aarch64 failed with a nonzero exit code. Command line:     cd /host

/host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/Logging.swift:1360:36: [1;31merror: [1;39mreference to var 'stderr' is not concurrency-safe because it involves shared mutable state[0;0m
[0;36m1358 |[0;0m         let systemStderr = Glibc.stderr!
[0;36m1359 |[0;0m         #elseif canImport(Android)
[0;36m1360 |[0;0m         let systemStderr = Android.stderr
     [0;36m|[0;0m                                    `- [1;31merror: [1;39mreference to var 'stderr' is not concurrency-safe because it involves shared mutable state[0;0m
[0;36m1361 |[0;0m         #elseif canImport(Musl)
[0;36m1362 |[0;0m         let systemStderr = Musl.stderr!
/android-ndk/android-ndk-r27d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdio.h:64:23: [1;39mnote: [1;39mvar declared here[0;0m
 [0;36m62 |[0;0m extern FILE* _Nonnull stdin __INTRODUCED_IN(23);
 [0;36m63 |[0;0m extern FILE* _Nonnull stdout __INTRODUCED_IN(23);
 [0;36m64 |[0;0m extern FILE* _Nonnull stderr __INTRODUCED_IN(23);
    [0;36m|[0;0m                       `- [1;39mnote: [1;39mvar declared here[0;0m
 [0;36m65 |[0;0m
 [0;36m66 |[0;0m /* C99 and earlier plus current C++ standards say these must be macros. */
/host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/Logging.swift:1380:36: [1;31merror: [1;39mreference to var 'stdout' is not concurrency-safe because it involves shared mutable state[0;0m
[0;36m1378 |[0;0m         let systemStdout = Glibc.stdout!
[0;36m1379 |[0;0m         #elseif canImport(Android)
[0;36m1380 |[0;0m         let systemStdout = Android.stdout
     [0;36m|[0;0m                                    `- [1;31merror: [1;39mreference to var 'stdout' is not concurrency-safe because it involves shared mutable state[0;0m
[0;36m1381 |[0;0m         #elseif canImport(Musl)
[0;36m1382 |[0;0m         let systemStdout = Musl.stdout!
/android-ndk/android-ndk-r27d/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include/stdio.h:63:23: [1;39mnote: [1;39mvar declared here[0;0m
 [0;36m61 |[0;0m #if __ANDROID_API__ >= 23
 [0;36m62 |[0;0m extern FILE* _Nonnull stdin __INTRODUCED_IN(23);
 [0;36m63 |[0;0m extern FILE* _Nonnull stdout __INTRODUCED_IN(23);
    [0;36m|[0;0m                       `- [1;39mnote: [1;39mvar declared here[0;0m
 [0;36m64 |[0;0m extern FILE* _Nonnull stderr __INTRODUCED_IN(23);
 [0;36m65 |[0;0m
Failed frontend command:
/root/.local/share/swiftly/toolchains/6.4.x-snapshot-2026-09-04/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/Locks.swift /host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/LogHandler.swift /host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/Logging.swift /host/spi-builder-workspace/.build/checkouts/swift-log/Sources/Logging/MetadataProvider.swift -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 -suppress-warnings -swift-version 6 -Onone -D SWIFT_PACKAGE -D DEBUG -D SWIFT_MODULE_RESOURCE_BUNDLE_UNAVAILABLE -D Xcode -serialize-debugging-options -enable-experimental-feature StrictConcurrency\=complete -enable-upcoming-feature MemberImportVisibility -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 -user-module-version 1.7.0 -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/swift-log.build/Debug-android-aarch64/Logging-t.build/DerivedSources-normal/aarch64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/DerivedSources/aarch64 -Xcc -I/host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name Logging -package-name swift_log -const-gather-protocols-file /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Logging_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 -emit-module-doc-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Modules/Logging.swiftdoc -emit-module-source-info-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Modules/Logging.swiftsourceinfo -emit-objc-header-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Logging-Swift.h -serialize-diagnostics-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Logging-primary-emit-module.dia -emit-dependencies-path /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Logging-primary-emit-module.d -parse-as-library -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/swift-log.build/Debug-android-aarch64/Logging-t.build/Objects-normal/aarch64/Modules/Logging.swiftmodule
error: Build failed
BUILD FAILURE 6.4 android