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Track the adoption of Swift 6 strict concurrency checks for data race safety. How many packages are Ready for Swift 6?

Build Information

Successful build of CustomTabView, reference main (622dfe), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 08:05:35 UTC.

Swift 6 data race errors: 2

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 InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/NicFontana/SwiftUI-CustomTabView.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/NicFontana/SwiftUI-CustomTabView
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 622dfef Merge pull request #7 from NicFontana/feat/support-ios-18-swiftui-containers
Cloned https://github.com/NicFontana/SwiftUI-CustomTabView.git
Revision (git rev-parse @):
622dfef343c3840a6c0545e61576ba3fa4424b66
SUCCESS checkout https://github.com/NicFontana/SwiftUI-CustomTabView.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/NicFontana/SwiftUI-CustomTabView.git
https://github.com/NicFontana/SwiftUI-CustomTabView.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "CustomTabView",
  "name" : "CustomTabView",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "CustomTabView",
      "targets" : [
        "CustomTabView"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "CustomTabViewTests",
      "module_type" : "SwiftTarget",
      "name" : "CustomTabViewTests",
      "path" : "Tests/CustomTabViewTests",
      "sources" : [
        "CustomTabViewTests.swift"
      ],
      "target_dependencies" : [
        "CustomTabView"
      ],
      "type" : "test"
    },
    {
      "c99name" : "CustomTabView",
      "module_type" : "SwiftTarget",
      "name" : "CustomTabView",
      "path" : "Sources/CustomTabView",
      "product_memberships" : [
        "CustomTabView"
      ],
      "sources" : [
        "CustomTabView.swift",
        "EnvironmentValues+TabBarPosition.swift",
        "Example/BottomFloatingTabBarView.swift",
        "Example/ExampleView.swift",
        "Example/Tab.swift",
        "Example/TopIndicatorTabBarView.swift",
        "iOS/KeyboardReadable.swift",
        "iOS/UITabBarControllerRepresentable.swift",
        "macOS/NSTabBarControllerRepresentable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
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
[3/12] Compiling CustomTabView UITabBarControllerRepresentable.swift
[4/12] Compiling CustomTabView KeyboardReadable.swift
[5/12] Compiling CustomTabView TopIndicatorTabBarView.swift
/Users/admin/builder/spi-builder-workspace/Sources/CustomTabView/Example/TopIndicatorTabBarView.swift:83:16: 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
 81 |
 82 | struct SizePreferenceKey: PreferenceKey {
 83 |     static var defaultValue: CGSize = .zero
    |                |- 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
 84 |     static func reduce(value: inout CGSize, nextValue: () -> CGSize) {}
 85 | }
[6/12] Compiling CustomTabView ExampleView.swift
[7/12] Compiling CustomTabView BottomFloatingTabBarView.swift
[8/12] Compiling CustomTabView EnvironmentValues+TabBarPosition.swift
/Users/admin/builder/spi-builder-workspace/Sources/CustomTabView/EnvironmentValues+TabBarPosition.swift:24:16: warning: static property 'defaultValue' is not concurrency-safe because non-'Sendable' type 'TabBarPosition' may have shared mutable state; this is an error in the Swift 6 language mode
 9 |
10 | /// An enumaration that is used to set the tab bar view position.
11 | public enum TabBarPosition {
   |             `- note: consider making enum 'TabBarPosition' conform to the 'Sendable' protocol
12 |     /// Puts the tab bar next to the content, at one edge of the scene.
13 |     ///
   :
22 |
23 | private struct TabBarPositionEnvironmentKey: EnvironmentKey {
24 |     static let defaultValue: TabBarPosition = .edge(.bottom)
   |                |- warning: static property 'defaultValue' is not concurrency-safe because non-'Sendable' type 'TabBarPosition' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- 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
25 | }
26 |
[9/12] Compiling CustomTabView CustomTabView.swift
[10/12] Emitting module CustomTabView
/Users/admin/builder/spi-builder-workspace/Sources/CustomTabView/EnvironmentValues+TabBarPosition.swift:24:16: warning: static property 'defaultValue' is not concurrency-safe because non-'Sendable' type 'TabBarPosition' may have shared mutable state; this is an error in the Swift 6 language mode
 9 |
10 | /// An enumaration that is used to set the tab bar view position.
11 | public enum TabBarPosition {
   |             `- note: consider making enum 'TabBarPosition' conform to the 'Sendable' protocol
12 |     /// Puts the tab bar next to the content, at one edge of the scene.
13 |     ///
   :
22 |
23 | private struct TabBarPositionEnvironmentKey: EnvironmentKey {
24 |     static let defaultValue: TabBarPosition = .edge(.bottom)
   |                |- warning: static property 'defaultValue' is not concurrency-safe because non-'Sendable' type 'TabBarPosition' may have shared mutable state; this is an error in the Swift 6 language mode
   |                |- 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
25 | }
26 |
/Users/admin/builder/spi-builder-workspace/Sources/CustomTabView/Example/TopIndicatorTabBarView.swift:83:16: 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
 81 |
 82 | struct SizePreferenceKey: PreferenceKey {
 83 |     static var defaultValue: CGSize = .zero
    |                |- 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
 84 |     static func reduce(value: inout CGSize, nextValue: () -> CGSize) {}
 85 | }
[11/12] Compiling CustomTabView NSTabBarControllerRepresentable.swift
[12/12] Compiling CustomTabView Tab.swift
Build complete! (9.34s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "CustomTabView",
  "name" : "CustomTabView",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    }
  ],
  "products" : [
    {
      "name" : "CustomTabView",
      "targets" : [
        "CustomTabView"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "CustomTabViewTests",
      "module_type" : "SwiftTarget",
      "name" : "CustomTabViewTests",
      "path" : "Tests/CustomTabViewTests",
      "sources" : [
        "CustomTabViewTests.swift"
      ],
      "target_dependencies" : [
        "CustomTabView"
      ],
      "type" : "test"
    },
    {
      "c99name" : "CustomTabView",
      "module_type" : "SwiftTarget",
      "name" : "CustomTabView",
      "path" : "Sources/CustomTabView",
      "product_memberships" : [
        "CustomTabView"
      ],
      "sources" : [
        "CustomTabView.swift",
        "EnvironmentValues+TabBarPosition.swift",
        "Example/BottomFloatingTabBarView.swift",
        "Example/ExampleView.swift",
        "Example/Tab.swift",
        "Example/TopIndicatorTabBarView.swift",
        "iOS/KeyboardReadable.swift",
        "iOS/UITabBarControllerRepresentable.swift",
        "macOS/NSTabBarControllerRepresentable.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
Done.