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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 Cooponent, reference main (a80f70), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 05:17:57 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 InferSendableFromCaptures

Build Log

========================================
RunAll
========================================
Builder version: 4.61.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/Talljack/Cooponent.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/Talljack/Cooponent
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at a80f702 chore: add Swift language version specification (#2)
Cloned https://github.com/Talljack/Cooponent.git
Revision (git rev-parse @):
a80f702914a6b4fcb676dde3a4d35881d1d9506f
SUCCESS checkout https://github.com/Talljack/Cooponent.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/Talljack/Cooponent.git
https://github.com/Talljack/Cooponent.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Cooponent",
  "name" : "Cooponent",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "macos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "Cooponent",
      "targets" : [
        "Button",
        "Segment",
        "Examples"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "Segment",
      "module_type" : "SwiftTarget",
      "name" : "Segment",
      "path" : "Sources/Segment",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "SegmentedControl.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Examples",
      "module_type" : "SwiftTarget",
      "name" : "Examples",
      "path" : "Sources/Examples",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "SegmentedControlExample.swift"
      ],
      "target_dependencies" : [
        "Button",
        "Segment"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CooponentTests",
      "module_type" : "SwiftTarget",
      "name" : "CooponentTests",
      "path" : "Tests/CooponentTests",
      "sources" : [
        "CooponentTests.swift"
      ],
      "target_dependencies" : [
        "Button",
        "Segment"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Button",
      "module_type" : "SwiftTarget",
      "name" : "Button",
      "path" : "Sources/Button",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "CustomButton.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...
[0/4] Write sources
[3/4] Write swift-version-2F0A5646E1D333AE.txt
[5/8] Compiling Button CustomButton.swift
[6/8] Emitting module Button
[7/8] Emitting module Segment
/Users/admin/builder/spi-builder-workspace/Sources/Segment/SegmentedControl.swift:6:16: 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
  4 |
  5 | private struct SizeKey: PreferenceKey {
  6 |     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
  7 |     static func reduce(value: inout CGSize, nextValue: () -> CGSize) {
  8 |         value = nextValue()
[8/8] Compiling Segment SegmentedControl.swift
/Users/admin/builder/spi-builder-workspace/Sources/Segment/SegmentedControl.swift:6:16: 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
  4 |
  5 | private struct SizeKey: PreferenceKey {
  6 |     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
  7 |     static func reduce(value: inout CGSize, nextValue: () -> CGSize) {
  8 |         value = nextValue()
[9/10] Compiling Examples SegmentedControlExample.swift
[10/10] Emitting module Examples
Build complete! (8.69s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Cooponent",
  "name" : "Cooponent",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "macos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "Cooponent",
      "targets" : [
        "Button",
        "Segment",
        "Examples"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "Segment",
      "module_type" : "SwiftTarget",
      "name" : "Segment",
      "path" : "Sources/Segment",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "SegmentedControl.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "Examples",
      "module_type" : "SwiftTarget",
      "name" : "Examples",
      "path" : "Sources/Examples",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "SegmentedControlExample.swift"
      ],
      "target_dependencies" : [
        "Button",
        "Segment"
      ],
      "type" : "library"
    },
    {
      "c99name" : "CooponentTests",
      "module_type" : "SwiftTarget",
      "name" : "CooponentTests",
      "path" : "Tests/CooponentTests",
      "sources" : [
        "CooponentTests.swift"
      ],
      "target_dependencies" : [
        "Button",
        "Segment"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Button",
      "module_type" : "SwiftTarget",
      "name" : "Button",
      "path" : "Sources/Button",
      "product_memberships" : [
        "Cooponent"
      ],
      "sources" : [
        "CustomButton.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
Done.