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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 SwiftRestClient, reference 0.7.1 (eb7b2f), with Swift 6.1 for macOS (SPM) on 30 Apr 2025 05:15:56 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/duhnnie/SwiftRestClient.git
Reference: 0.7.1
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/duhnnie/SwiftRestClient
 * tag               0.7.1      -> FETCH_HEAD
HEAD is now at eb7b2fc Merge pull request #21 from duhnnie/release/0.7.1
Cloned https://github.com/duhnnie/SwiftRestClient.git
Revision (git rev-parse @):
eb7b2fcf534b0293e11e139866c5117bc56e7695
SUCCESS checkout https://github.com/duhnnie/SwiftRestClient.git at 0.7.1
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/duhnnie/SwiftRestClient.git
https://github.com/duhnnie/SwiftRestClient.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftRestClient",
  "name" : "SwiftRestClient",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftRestClient",
      "targets" : [
        "SwiftRestClient"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "SwiftRestClientTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftRestClientTests",
      "path" : "Tests/SwiftRestClientTests",
      "sources" : [
        "SwiftRestClientTests.swift"
      ],
      "target_dependencies" : [
        "SwiftRestClient"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftRestClient",
      "module_type" : "SwiftTarget",
      "name" : "SwiftRestClient",
      "path" : "Sources/SwiftRestClient",
      "product_memberships" : [
        "SwiftRestClient"
      ],
      "sources" : [
        "Encoders/HTTPFormURLEncoded.swift",
        "SwiftRestClient.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
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 SwiftRestClient HTTPFormURLEncoded.swift
[4/5] Compiling SwiftRestClient SwiftRestClient.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftRestClient/SwiftRestClient.swift:18:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'SwiftRestClient' may have shared mutable state; this is an error in the Swift 6 language mode
  4 | #endif
  5 |
  6 | public class SwiftRestClient {
    |              `- note: class 'SwiftRestClient' does not conform to the 'Sendable' protocol
  7 |     private enum HTTPMethod: String {
  8 |         case GET
    :
 16 |     }
 17 |
 18 |     public static let shared = SwiftRestClient()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'SwiftRestClient' 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
 19 |     public typealias RequestCompletion = (Data?, URLResponse?, Error?) -> Void
 20 |     public typealias Headers = [String: String]
/Users/admin/builder/spi-builder-workspace/Sources/SwiftRestClient/SwiftRestClient.swift:43:85: warning: passing non-sendable parameter 'onCompletion' to function expecting a @Sendable closure
 27 |         body: Data? = nil,
 28 |         headers: Headers? = nil,
 29 |         onCompletion: @escaping RequestCompletion
    |         `- note: parameter 'onCompletion' is implicitly non-sendable
 30 |     ) -> Void {
 31 |         var request = URLRequest(url: url)
    :
 41 |         request.httpBody = body
 42 |
 43 |         let dataTask = URLSession.shared.dataTask(with: request, completionHandler: onCompletion)
    |                                                                                     `- warning: passing non-sendable parameter 'onCompletion' to function expecting a @Sendable closure
 44 |
 45 |         dataTask.resume()
[5/5] Emitting module SwiftRestClient
/Users/admin/builder/spi-builder-workspace/Sources/SwiftRestClient/SwiftRestClient.swift:18:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'SwiftRestClient' may have shared mutable state; this is an error in the Swift 6 language mode
  4 | #endif
  5 |
  6 | public class SwiftRestClient {
    |              `- note: class 'SwiftRestClient' does not conform to the 'Sendable' protocol
  7 |     private enum HTTPMethod: String {
  8 |         case GET
    :
 16 |     }
 17 |
 18 |     public static let shared = SwiftRestClient()
    |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'SwiftRestClient' 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
 19 |     public typealias RequestCompletion = (Data?, URLResponse?, Error?) -> Void
 20 |     public typealias Headers = [String: String]
Build complete! (4.06s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftRestClient",
  "name" : "SwiftRestClient",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "11.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "watchos",
      "version" : "4.0"
    },
    {
      "name" : "tvos",
      "version" : "11.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftRestClient",
      "targets" : [
        "SwiftRestClient"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "5"
  ],
  "targets" : [
    {
      "c99name" : "SwiftRestClientTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftRestClientTests",
      "path" : "Tests/SwiftRestClientTests",
      "sources" : [
        "SwiftRestClientTests.swift"
      ],
      "target_dependencies" : [
        "SwiftRestClient"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftRestClient",
      "module_type" : "SwiftTarget",
      "name" : "SwiftRestClient",
      "path" : "Sources/SwiftRestClient",
      "product_memberships" : [
        "SwiftRestClient"
      ],
      "sources" : [
        "Encoders/HTTPFormURLEncoded.swift",
        "SwiftRestClient.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Done.