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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 Chronometer, reference main (8e2ef4), with Swift 6.0 for macOS (SPM) on 5 Nov 2024 14:27:04 UTC.

Swift 6 data race errors: 2

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.56.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/KittyMac/Chronometer.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/KittyMac/Chronometer
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 8e2ef49 update docker buildx
Cloned https://github.com/KittyMac/Chronometer.git
Revision (git rev-parse @):
8e2ef491dac8699487fa71adb73636f729450524
SUCCESS checkout https://github.com/KittyMac/Chronometer.git at main
========================================
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": "chronometer",
      "name": "Chronometer",
      "url": "https://github.com/KittyMac/Chronometer.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Chronometer",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/KittyMac/Chronometer.git
[1/187] Fetching chronometer
Fetched https://github.com/KittyMac/Chronometer.git from cache (1.22s)
Creating working copy for https://github.com/KittyMac/Chronometer.git
Working copy of https://github.com/KittyMac/Chronometer.git resolved at main (8e2ef49)
warning: '.resolve-product-dependencies': dependency 'chronometer' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/KittyMac/Chronometer.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--7754E27361AE5C74.txt
[3/4] Emitting module Chronometer
/Users/admin/builder/spi-builder-workspace/Sources/Chronometer/Chronometer.swift:73:17: warning: var 'allDateFormats' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 71 | }
 72 |
 73 | fileprivate var allDateFormats = [DateFormat]()
    |                 |- warning: var 'allDateFormats' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                 |- note: convert 'allDateFormats' to a 'let' constant to make 'Sendable' shared state immutable
    |                 |- note: annotate 'allDateFormats' with '@MainActor' if property should only be accessed from the main actor
    |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 74 | fileprivate var allDateFormatsLock = NSLock()
 75 | fileprivate func initDateFormats() {
/Users/admin/builder/spi-builder-workspace/Sources/Chronometer/Chronometer.swift:74:17: warning: var 'allDateFormatsLock' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 72 |
 73 | fileprivate var allDateFormats = [DateFormat]()
 74 | fileprivate var allDateFormatsLock = NSLock()
    |                 |- warning: var 'allDateFormatsLock' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                 |- note: convert 'allDateFormatsLock' to a 'let' constant to make 'Sendable' shared state immutable
    |                 |- note: annotate 'allDateFormatsLock' with '@MainActor' if property should only be accessed from the main actor
    |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 75 | fileprivate func initDateFormats() {
 76 |     guard allDateFormats.count == 0 else { return }
[4/4] Compiling Chronometer Chronometer.swift
/Users/admin/builder/spi-builder-workspace/Sources/Chronometer/Chronometer.swift:73:17: warning: var 'allDateFormats' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 71 | }
 72 |
 73 | fileprivate var allDateFormats = [DateFormat]()
    |                 |- warning: var 'allDateFormats' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                 |- note: convert 'allDateFormats' to a 'let' constant to make 'Sendable' shared state immutable
    |                 |- note: annotate 'allDateFormats' with '@MainActor' if property should only be accessed from the main actor
    |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 74 | fileprivate var allDateFormatsLock = NSLock()
 75 | fileprivate func initDateFormats() {
/Users/admin/builder/spi-builder-workspace/Sources/Chronometer/Chronometer.swift:74:17: warning: var 'allDateFormatsLock' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 72 |
 73 | fileprivate var allDateFormats = [DateFormat]()
 74 | fileprivate var allDateFormatsLock = NSLock()
    |                 |- warning: var 'allDateFormatsLock' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                 |- note: convert 'allDateFormatsLock' to a 'let' constant to make 'Sendable' shared state immutable
    |                 |- note: annotate 'allDateFormatsLock' with '@MainActor' if property should only be accessed from the main actor
    |                 `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 75 | fileprivate func initDateFormats() {
 76 |     guard allDateFormats.count == 0 else { return }
Build complete! (5.83s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Chronometer",
  "name" : "Chronometer",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "10.13"
    },
    {
      "name" : "ios",
      "version" : "11.0"
    }
  ],
  "products" : [
    {
      "name" : "Chronometer",
      "targets" : [
        "Chronometer"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ChronometerTests",
      "module_type" : "SwiftTarget",
      "name" : "ChronometerTests",
      "path" : "Tests/ChronometerTests",
      "sources" : [
        "Tests.swift",
        "TestsBase.swift"
      ],
      "target_dependencies" : [
        "Chronometer"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Chronometer",
      "module_type" : "SwiftTarget",
      "name" : "Chronometer",
      "path" : "Sources/Chronometer",
      "product_memberships" : [
        "Chronometer"
      ],
      "sources" : [
        "Chronometer.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.2"
}
Done.