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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 IsScrolling, reference 1.2.0 (f828c0), with Swift 6.1 for macOS (SPM) on 1 May 2025 03:45:30 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: 4.61.2
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/fatbobman/IsScrolling.git
Reference: 1.2.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/fatbobman/IsScrolling
 * tag               1.2.0      -> FETCH_HEAD
HEAD is now at f828c01 Merge pull request #4 from jmonroe/main
Cloned https://github.com/fatbobman/IsScrolling.git
Revision (git rev-parse @):
f828c01e563abe06778e46a6784d46f73cb28deb
SUCCESS checkout https://github.com/fatbobman/IsScrolling.git at 1.2.0
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "isscrolling",
      "name": "IsScrolling",
      "url": "https://github.com/fatbobman/IsScrolling.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/IsScrolling",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/fatbobman/IsScrolling.git
[1/185] Fetching isscrolling
Fetched https://github.com/fatbobman/IsScrolling.git from cache (0.62s)
Creating working copy for https://github.com/fatbobman/IsScrolling.git
Working copy of https://github.com/fatbobman/IsScrolling.git resolved at 1.2.0 (f828c01)
warning: '.resolve-product-dependencies': dependency 'isscrolling' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/fatbobman/IsScrolling.git
https://github.com/fatbobman/IsScrolling.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "IsScrolling",
  "name" : "IsScrolling",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "14.0"
    },
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "14.0"
    }
  ],
  "products" : [
    {
      "name" : "IsScrolling",
      "targets" : [
        "IsScrolling"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "IsScrollingTests",
      "module_type" : "SwiftTarget",
      "name" : "IsScrollingTests",
      "path" : "Tests/IsScrollingTests",
      "sources" : [
        "IsScrollingTests.swift"
      ],
      "target_dependencies" : [
        "IsScrolling"
      ],
      "type" : "test"
    },
    {
      "c99name" : "IsScrolling",
      "module_type" : "SwiftTarget",
      "name" : "IsScrolling",
      "path" : "Sources/IsScrolling",
      "product_memberships" : [
        "IsScrolling"
      ],
      "sources" : [
        "IsScrolling.swift",
        "Key.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
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
[3/5] Compiling IsScrolling Key.swift
/Users/admin/builder/spi-builder-workspace/Sources/IsScrolling/Key.swift:12:16: 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
10 |
11 | struct IsScrollingValueKey: EnvironmentKey {
12 |     static var defaultValue = false
   |                |- 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
13 | }
14 |
/Users/admin/builder/spi-builder-workspace/Sources/IsScrolling/Key.swift:23:23: 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
21 |
22 | public struct MinValueKey: PreferenceKey {
23 |     public static var defaultValue: CGRect = .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
24 |     public static func reduce(value: inout CGRect, nextValue: () -> CGRect) {
25 |         value = nextValue()
[4/5] Emitting module IsScrolling
/Users/admin/builder/spi-builder-workspace/Sources/IsScrolling/Key.swift:12:16: 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
10 |
11 | struct IsScrollingValueKey: EnvironmentKey {
12 |     static var defaultValue = false
   |                |- 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
13 | }
14 |
/Users/admin/builder/spi-builder-workspace/Sources/IsScrolling/Key.swift:23:23: 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
21 |
22 | public struct MinValueKey: PreferenceKey {
23 |     public static var defaultValue: CGRect = .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
24 |     public static func reduce(value: inout CGRect, nextValue: () -> CGRect) {
25 |         value = nextValue()
[5/5] Compiling IsScrolling IsScrolling.swift
/Users/admin/builder/spi-builder-workspace/Sources/IsScrolling/IsScrolling.swift:135:53: warning: sending 'self' risks causing data races; this is an error in the Swift 6 language mode
133 |                     self.timestamp = Date()
134 |                     DispatchQueue.main.asyncAfter(deadline: .now() + 0.15) {
135 |                         if Date().timeIntervalSince(self.timestamp) > 0.1 {
    |                                                     |- warning: sending 'self' risks causing data races; this is an error in the Swift 6 language mode
    |                                                     `- note: task-isolated 'self' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
136 |                             self.timeoutPublisher.send(0)
137 |                         }
Build complete! (8.33s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "IsScrolling",
  "name" : "IsScrolling",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "14.0"
    },
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "14.0"
    }
  ],
  "products" : [
    {
      "name" : "IsScrolling",
      "targets" : [
        "IsScrolling"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "IsScrollingTests",
      "module_type" : "SwiftTarget",
      "name" : "IsScrollingTests",
      "path" : "Tests/IsScrollingTests",
      "sources" : [
        "IsScrollingTests.swift"
      ],
      "target_dependencies" : [
        "IsScrolling"
      ],
      "type" : "test"
    },
    {
      "c99name" : "IsScrolling",
      "module_type" : "SwiftTarget",
      "name" : "IsScrolling",
      "path" : "Sources/IsScrolling",
      "product_memberships" : [
        "IsScrolling"
      ],
      "sources" : [
        "IsScrolling.swift",
        "Key.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
Done.