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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 ProgressReporter, reference master (63b550), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 14:41:03 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: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/Sam-Spencer/ProgressReporter.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/Sam-Spencer/ProgressReporter
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 63b5508 Create FUNDING.yml
Cloned https://github.com/Sam-Spencer/ProgressReporter.git
Revision (git rev-parse @):
63b5508dfc67bc1e4892501d6d75dc45ca4d1446
SUCCESS checkout https://github.com/Sam-Spencer/ProgressReporter.git at master
========================================
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": "progressreporter",
      "name": "ProgressReporter",
      "url": "https://github.com/Sam-Spencer/ProgressReporter.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/ProgressReporter",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/Sam-Spencer/ProgressReporter.git
[1/148] Fetching progressreporter
Fetched https://github.com/Sam-Spencer/ProgressReporter.git from cache (0.72s)
Creating working copy for https://github.com/Sam-Spencer/ProgressReporter.git
Working copy of https://github.com/Sam-Spencer/ProgressReporter.git resolved at master (63b5508)
warning: '.resolve-product-dependencies': dependency 'progressreporter' 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/Sam-Spencer/ProgressReporter.git
https://github.com/Sam-Spencer/ProgressReporter.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ProgressReporter",
  "name" : "ProgressReporter",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    }
  ],
  "products" : [
    {
      "name" : "ProgressReporter",
      "targets" : [
        "ProgressReporter"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ProgressReporterTests",
      "module_type" : "SwiftTarget",
      "name" : "ProgressReporterTests",
      "path" : "Tests/ProgressReporterTests",
      "sources" : [
        "ProgressReporterTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "ProgressReporter"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ProgressReporter",
      "module_type" : "SwiftTarget",
      "name" : "ProgressReporter",
      "path" : "Sources/ProgressReporter",
      "product_memberships" : [
        "ProgressReporter"
      ],
      "sources" : [
        "ProgressReporter.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
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] Compiling ProgressReporter ProgressReporter.swift
/Users/admin/builder/spi-builder-workspace/Sources/ProgressReporter/ProgressReporter.swift:105:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ProgressCoordinator' may have shared mutable state; this is an error in the Swift 6 language mode
101 | ///
102 | @available(iOS 13.0, *)
103 | open class ProgressCoordinator: ProgressCensus {
    |            `- note: class 'ProgressCoordinator' does not conform to the 'Sendable' protocol
104 |
105 |     public static let shared = ProgressCoordinator()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ProgressCoordinator' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
106 |     public var watcher: ProgressWatcher?
107 |
/Users/admin/builder/spi-builder-workspace/Sources/ProgressReporter/ProgressReporter.swift:192:17: warning: sending 'self' risks causing data races; this is an error in the Swift 6 language mode
190 |         } else {
191 |             DispatchQueue.main.async {
192 |                 self.watcher?.hasProgressToReport(report: self.progress)
    |                 |- 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
193 |                 self.rawProgress = self.progress.progress
194 |             }
/Users/admin/builder/spi-builder-workspace/Sources/ProgressReporter/ProgressReporter.swift:207:17: warning: sending 'task' risks causing data races; this is an error in the Swift 6 language mode
205 |         } else {
206 |             DispatchQueue.main.async {
207 |                 task()
    |                 |- warning: sending 'task' risks causing data races; this is an error in the Swift 6 language mode
    |                 `- note: task-isolated 'task' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
208 |             }
209 |         }
[4/4] Emitting module ProgressReporter
/Users/admin/builder/spi-builder-workspace/Sources/ProgressReporter/ProgressReporter.swift:105:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ProgressCoordinator' may have shared mutable state; this is an error in the Swift 6 language mode
101 | ///
102 | @available(iOS 13.0, *)
103 | open class ProgressCoordinator: ProgressCensus {
    |            `- note: class 'ProgressCoordinator' does not conform to the 'Sendable' protocol
104 |
105 |     public static let shared = ProgressCoordinator()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ProgressCoordinator' may have shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
106 |     public var watcher: ProgressWatcher?
107 |
Build complete! (4.45s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ProgressReporter",
  "name" : "ProgressReporter",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    }
  ],
  "products" : [
    {
      "name" : "ProgressReporter",
      "targets" : [
        "ProgressReporter"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ProgressReporterTests",
      "module_type" : "SwiftTarget",
      "name" : "ProgressReporterTests",
      "path" : "Tests/ProgressReporterTests",
      "sources" : [
        "ProgressReporterTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "ProgressReporter"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ProgressReporter",
      "module_type" : "SwiftTarget",
      "name" : "ProgressReporter",
      "path" : "Sources/ProgressReporter",
      "product_memberships" : [
        "ProgressReporter"
      ],
      "sources" : [
        "ProgressReporter.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Done.