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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 Watchdog, reference master (2df9ac), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 14:13:11 UTC.

Swift 6 data race errors: 0

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/wojteklu/Watchdog.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/wojteklu/Watchdog
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 2df9acf Add support for SwiftPM (#51)
Cloned https://github.com/wojteklu/Watchdog.git
Revision (git rev-parse @):
2df9acf8472a1f1146fc0f41e37d3f424dba72d6
SUCCESS checkout https://github.com/wojteklu/Watchdog.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": "watchdog",
      "name": "Watchdog",
      "url": "https://github.com/wojteklu/Watchdog.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Watchdog",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/wojteklu/Watchdog.git
[8/358] Fetching watchdog
Fetched https://github.com/wojteklu/Watchdog.git from cache (0.82s)
Creating working copy for https://github.com/wojteklu/Watchdog.git
Working copy of https://github.com/wojteklu/Watchdog.git resolved at master (2df9acf)
warning: '.resolve-product-dependencies': dependency 'watchdog' 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/wojteklu/Watchdog.git
https://github.com/wojteklu/Watchdog.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Watchdog",
  "name" : "Watchdog",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Watchdog",
      "targets" : [
        "Watchdog"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Watchdog",
      "module_type" : "SwiftTarget",
      "name" : "Watchdog",
      "path" : "Classes",
      "product_memberships" : [
        "Watchdog"
      ],
      "sources" : [
        "Watchdog.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
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] Emitting module Watchdog
[4/4] Compiling Watchdog Watchdog.swift
/Users/admin/builder/spi-builder-workspace/Classes/Watchdog.swift:70:17: warning: sending 'self' risks causing data races; this is an error in the Swift 6 language mode
68 |             pingTaskIsRunning = true
69 |             DispatchQueue.main.async {
70 |                 self.pingTaskIsRunning = false
   |                 |- 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
71 |                 self.semaphore.signal()
72 |             }
Build complete! (3.96s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Watchdog",
  "name" : "Watchdog",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Watchdog",
      "targets" : [
        "Watchdog"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Watchdog",
      "module_type" : "SwiftTarget",
      "name" : "Watchdog",
      "path" : "Classes",
      "product_memberships" : [
        "Watchdog"
      ],
      "sources" : [
        "Watchdog.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.