Swift Package IndexBuild Information
Successful build of SwiftUIFlowLayout, reference main (5516ff), with Swift 6.1 for macOS (SPM) on 14 Aug 2026 14:53:33 UTC.
Swift 6 data race errors: 1
Build Command
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCapturesBuild Log
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RunAll
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Builder version: undefined version: run 'make version' to update
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/globulus/swiftui-flow-layout.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/globulus/swiftui-flow-layout
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 5516ff7 Merge pull request #15 from MojtabaHs/main
Cloned https://github.com/globulus/swiftui-flow-layout.git
Revision (git rev-parse @):
5516ff7e2bfce8befc36e76ce27cd8f4aedaea61
SUCCESS checkout https://github.com/globulus/swiftui-flow-layout.git at main
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Build
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Selected platform: macosSpm
Swift version: 6.1
Building package at path: $PWD
https://github.com/globulus/swiftui-flow-layout.git
https://github.com/globulus/swiftui-flow-layout.git
{
"dependencies" : [
],
"manifest_display_name" : "SwiftUIFlowLayout",
"name" : "SwiftUIFlowLayout",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
{
"name" : "ios",
"version" : "13.0"
},
{
"name" : "macos",
"version" : "10.15"
}
],
"products" : [
{
"name" : "SwiftUIFlowLayout",
"targets" : [
"SwiftUIFlowLayout"
],
"type" : {
"library" : [
"automatic"
]
}
}
],
"targets" : [
{
"c99name" : "SwiftUIFlowLayout",
"module_type" : "SwiftTarget",
"name" : "SwiftUIFlowLayout",
"path" : "Sources/SwiftUIFlowLayout",
"product_memberships" : [
"SwiftUIFlowLayout"
],
"sources" : [
"SwiftUIFlowLayout.swift"
],
"type" : "library"
}
],
"tools_version" : "5.3"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/4] Emitting module SwiftUIFlowLayout
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:84:14: warning: static property 'defaultValue' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
82 | private struct HeightPreferenceKey: PreferenceKey {
83 | static func reduce(value _: inout CGFloat, nextValue _: () -> CGFloat) {}
84 | static var defaultValue: CGFloat = 0
| |- warning: static property 'defaultValue' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
| |- note: convert 'defaultValue' to a 'let' constant to make 'Sendable' shared state immutable
| |- note: add '@MainActor' to make static property 'defaultValue' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
85 | }
86 |
[4/4] Compiling SwiftUIFlowLayout SwiftUIFlowLayout.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:84:14: warning: static property 'defaultValue' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
82 | private struct HeightPreferenceKey: PreferenceKey {
83 | static func reduce(value _: inout CGFloat, nextValue _: () -> CGFloat) {}
84 | static var defaultValue: CGFloat = 0
| |- warning: static property 'defaultValue' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
| |- note: convert 'defaultValue' to a 'let' constant to make 'Sendable' shared state immutable
| |- note: add '@MainActor' to make static property 'defaultValue' part of global actor 'MainActor'
| `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
85 | }
86 |
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:52:44: warning: capture of 'g' with non-sendable type 'GeometryProxy' in a '@Sendable' closure
50 | .padding([.horizontal, .vertical], itemSpacing)
51 | .alignmentGuide(.leading, computeValue: { d in
52 | if (abs(width - d.width) > g.size.width) {
| `- warning: capture of 'g' with non-sendable type 'GeometryProxy' in a '@Sendable' closure
53 | width = 0
54 | height -= lastHeight
SwiftUICore.GeometryProxy:2:15: note: struct 'GeometryProxy' does not conform to the 'Sendable' protocol
1 | @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
2 | public struct GeometryProxy {
| `- note: struct 'GeometryProxy' does not conform to the 'Sendable' protocol
3 | public var size: CGSize { get }
4 | public subscript<T>(anchor: Anchor<T>) -> T { get }
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:52:25: warning: reference to captured var 'width' in concurrently-executing code
50 | .padding([.horizontal, .vertical], itemSpacing)
51 | .alignmentGuide(.leading, computeValue: { d in
52 | if (abs(width - d.width) > g.size.width) {
| `- warning: reference to captured var 'width' in concurrently-executing code
53 | width = 0
54 | height -= lastHeight
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:53:19: warning: mutation of captured var 'width' in concurrently-executing code
51 | .alignmentGuide(.leading, computeValue: { d in
52 | if (abs(width - d.width) > g.size.width) {
53 | width = 0
| `- warning: mutation of captured var 'width' in concurrently-executing code
54 | height -= lastHeight
55 | }
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:54:19: warning: mutation of captured var 'height' in concurrently-executing code
52 | if (abs(width - d.width) > g.size.width) {
53 | width = 0
54 | height -= lastHeight
| `- warning: mutation of captured var 'height' in concurrently-executing code
55 | }
56 | lastHeight = d.height
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:54:29: warning: reference to captured var 'lastHeight' in concurrently-executing code
52 | if (abs(width - d.width) > g.size.width) {
53 | width = 0
54 | height -= lastHeight
| `- warning: reference to captured var 'lastHeight' in concurrently-executing code
55 | }
56 | lastHeight = d.height
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:56:17: warning: mutation of captured var 'lastHeight' in concurrently-executing code
54 | height -= lastHeight
55 | }
56 | lastHeight = d.height
| `- warning: mutation of captured var 'lastHeight' in concurrently-executing code
57 | let result = width
58 | if index == itemCount - 1 {
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:57:30: warning: reference to captured var 'width' in concurrently-executing code
55 | }
56 | lastHeight = d.height
57 | let result = width
| `- warning: reference to captured var 'width' in concurrently-executing code
58 | if index == itemCount - 1 {
59 | width = 0
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:59:19: warning: mutation of captured var 'width' in concurrently-executing code
57 | let result = width
58 | if index == itemCount - 1 {
59 | width = 0
| `- warning: mutation of captured var 'width' in concurrently-executing code
60 | } else {
61 | width -= d.width
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:61:19: warning: mutation of captured var 'width' in concurrently-executing code
59 | width = 0
60 | } else {
61 | width -= d.width
| `- warning: mutation of captured var 'width' in concurrently-executing code
62 | }
63 | return result
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:66:30: warning: reference to captured var 'height' in concurrently-executing code
64 | })
65 | .alignmentGuide(.top, computeValue: { d in
66 | let result = height
| `- warning: reference to captured var 'height' in concurrently-executing code
67 | if index == itemCount - 1 {
68 | height = 0
/Users/admin/builder/spi-builder-workspace/Sources/SwiftUIFlowLayout/SwiftUIFlowLayout.swift:68:19: warning: mutation of captured var 'height' in concurrently-executing code
66 | let result = height
67 | if index == itemCount - 1 {
68 | height = 0
| `- warning: mutation of captured var 'height' in concurrently-executing code
69 | }
70 | return result
Build complete! (7.46s)
Build complete.
{
"dependencies" : [
],
"manifest_display_name" : "SwiftUIFlowLayout",
"name" : "SwiftUIFlowLayout",
"path" : "/Users/admin/builder/spi-builder-workspace",
"platforms" : [
{
"name" : "ios",
"version" : "13.0"
},
{
"name" : "macos",
"version" : "10.15"
}
],
"products" : [
{
"name" : "SwiftUIFlowLayout",
"targets" : [
"SwiftUIFlowLayout"
],
"type" : {
"library" : [
"automatic"
]
}
}
],
"targets" : [
{
"c99name" : "SwiftUIFlowLayout",
"module_type" : "SwiftTarget",
"name" : "SwiftUIFlowLayout",
"path" : "Sources/SwiftUIFlowLayout",
"product_memberships" : [
"SwiftUIFlowLayout"
],
"sources" : [
"SwiftUIFlowLayout.swift"
],
"type" : "library"
}
],
"tools_version" : "5.3"
}
Done.