Swift Package Index

Build Information

Failed to build SteppedSlider, reference 1.0.1 (9dec26), with Swift 6.4 for macOS (SPM) on 22 Sep 2026 12:27:40 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64

Build Log

========================================
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/shima11/SteppedSlider.git
Reference: 1.0.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/shima11/SteppedSlider
 * tag               1.0.1      -> FETCH_HEAD
HEAD is now at 9dec26d update
Cloned https://github.com/shima11/SteppedSlider.git
Revision (git rev-parse @):
9dec26de3fb86ae44db31e746d61d2da6e3383fc
SUCCESS checkout https://github.com/shima11/SteppedSlider.git at 1.0.1
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/shima11/SteppedSlider.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-27.0.0-Release.Candidate.app xcrun swift build --arch arm64
Building for debugging...
[Planning deferred tasks]
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error: SwiftCompile normal arm64 failed with a nonzero exit code. Command line:     cd /Users/admin/builder

/Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SnapScrollBehavior.swift:38:21: error: 'ScrollTarget' is only available in macOS 14.0 or newer
12 |
13 | /// A structure that defines a snapping behavior for scroll targets, conforming to `ScrollTargetBehavior`.
14 | struct SnapScrollTargetBehavior: ScrollTargetBehavior {
   |        `- note: add '@available' attribute to enclosing struct
15 |   /// The step value to which the scroll target should snap.
16 |   let step: Double
   :
35 |   }
36 |
37 |   func updateTarget(
   |        `- note: add '@available' attribute to enclosing instance method
38 |     _ target: inout ScrollTarget,
   |                     `- error: 'ScrollTarget' is only available in macOS 14.0 or newer
39 |     context: TargetContext
40 |   ) {
/Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SnapScrollBehavior.swift:49:11: error: 'ScrollTargetBehavior' is only available in macOS 14.0 or newer
47 | }
48 |
49 | extension ScrollTargetBehavior where Self == SnapScrollTargetBehavior {
   | |         `- error: 'ScrollTargetBehavior' is only available in macOS 14.0 or newer
   | `- note: add '@available' attribute to enclosing extension
50 |   /// Creates a `SnapScrollTargetBehavior` with the specified step.
51 |   /// - Parameter step: The step value to which the scroll target should snap.
/Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SteppedSlider.swift:46:33: warning: cannot use default expression for inference of 'Modifier' because it is inferrable from parameters #5, #7; this will be an error in a future Swift language mode
 44 |     horizontalEdgeMask: HorizontalEdgeMask = .visible(width: 12),
 45 |     animation: Animation? = .default,
 46 |     segmentModifier: Modifier = EmptyModifier(),
    |                                 `- warning: cannot use default expression for inference of 'Modifier' because it is inferrable from parameters #5, #7; this will be an error in a future Swift language mode
 47 |     @ViewBuilder anchorView: @MainActor @escaping () -> Anchor,
 48 |     @ViewBuilder segmentView: @MainActor @escaping (Int, Int) -> Segment,
/Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SteppedSlider.swift:158:4: error: 'Previewable()' is only available in macOS 14.0 or newer
156 |
157 |   @Previewable @State var value: CGFloat = 5.8
158 |   @Previewable @State var toggle = false
    |    |- error: 'Previewable()' is only available in macOS 14.0 or newer
    |    `- note: add 'if #available' version check
159 |
160 |   let range: ClosedRange<CGFloat> = 1...50
/Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SteppedSlider.swift:157:4: error: 'Previewable()' is only available in macOS 14.0 or newer
155 | #Preview {
156 |
157 |   @Previewable @State var value: CGFloat = 5.8
    |    |- error: 'Previewable()' is only available in macOS 14.0 or newer
    |    `- note: add 'if #available' version check
158 |   @Previewable @State var toggle = false
159 |
Failed frontend command:
/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -emit-module -experimental-skip-non-inlinable-function-bodies-without-types /Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SnapScrollBehavior.swift /Users/admin/builder/spi-builder-workspace/Sources/SteppedSlider/SteppedSlider.swift -target arm64-apple-macos12.0 -disable-cross-import-overlay-search -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libFoundationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#FoundationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libObservationMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#ObservationMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libPreviewsMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#PreviewsMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libSwiftMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#SwiftMacros -load-resolved-plugin /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins/libSwiftUIMacros.dylib\#/Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server\#SwiftUIMacros -disable-implicit-swift-modules -Xcc -fno-implicit-modules -Xcc -fno-implicit-module-maps -explicit-swift-module-map-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider-dependencies-1.json -Xllvm -aarch64-use-tbi -enable-objc-interop -stack-check -sdk /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX27.0.sdk -I /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -Isystem /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug -F /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -module-cache-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SwiftExplicitPrecompiledModules -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 -validate-clang-modules-once -clang-build-session-file /Users/admin/builder/spi-builder-workspace/.build/out/ModuleCache.noindex/Session.modulevalidation -Xcc -working-directory -Xcc /Users/admin/builder -enable-anonymous-context-mangled-names -file-compilation-dir /Users/admin/builder -Xcc -D_LIBCPP_HARDENING_MODE\=_LIBCPP_HARDENING_MODE_DEBUG -Xcc -ivfsstatcache -Xcc /Users/admin/builder/spi-builder-workspace/.build/out/SDKStatCaches.noindex/macosx27.0-26A425-80c5bbf1d171475443272936d42f90a36a22442a12e9d48fe1a705f55a1adfc4.sdkstatcache -Xcc -fmodules-prune-interval\=86400 -Xcc -fmodules-prune-after\=345600 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Products/Debug/include -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/DerivedSources-normal/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/DerivedSources/arm64 -Xcc -I/Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/DerivedSources -Xcc -DSWIFT_PACKAGE -Xcc -DDEBUG\=1 -no-auto-bridging-header-chaining -module-name SteppedSlider -package-name spi_builder_workspace -const-gather-protocols-file /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider_const_extract_protocols.json -disable-clang-spi -clang-target arm64-apple-macos27.0 -target-sdk-version 27.0 -target-sdk-name macosx27.0 -in-process-plugin-server-path /Applications/Xcode-27.0.0-Release.Candidate.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/host/libSwiftInProcPluginServer.dylib -emit-module-doc-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider.swiftdoc -emit-module-source-info-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider.swiftsourceinfo -emit-objc-header-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider-Swift.h -serialize-diagnostics-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider-primary-emit-module.dia -emit-dependencies-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider-primary-emit-module.d -parse-as-library -o /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider.swiftmodule -emit-abi-descriptor-path /Users/admin/builder/spi-builder-workspace/.build/out/Intermediates.noindex/SteppedSlider.build/Debug/SteppedSlider-t.build/Objects-normal/arm64/SteppedSlider.abi.json
error: Build failed
BUILD FAILURE 6.4 macosSpm