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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 ControlledChaos, reference main (c69a93), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 09:01:57 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/btfranklin/ControlledChaos.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/btfranklin/ControlledChaos
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at c69a935 Update build.yml to use macos-latest again
Cloned https://github.com/btfranklin/ControlledChaos.git
Revision (git rev-parse @):
c69a935f81e4a523bb2ccc9b153849f00a5e2e12
SUCCESS checkout https://github.com/btfranklin/ControlledChaos.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": "controlledchaos",
      "name": "ControlledChaos",
      "url": "https://github.com/btfranklin/ControlledChaos.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/ControlledChaos",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/btfranklin/ControlledChaos.git
[1/125] Fetching controlledchaos
Fetched https://github.com/btfranklin/ControlledChaos.git from cache (0.57s)
Creating working copy for https://github.com/btfranklin/ControlledChaos.git
Working copy of https://github.com/btfranklin/ControlledChaos.git resolved at main (c69a935)
warning: '.resolve-product-dependencies': dependency 'controlledchaos' 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/btfranklin/ControlledChaos.git
https://github.com/btfranklin/ControlledChaos.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ControlledChaos",
  "name" : "ControlledChaos",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "11.0"
    },
    {
      "name" : "ios",
      "version" : "14.0"
    },
    {
      "name" : "tvos",
      "version" : "14.0"
    },
    {
      "name" : "watchos",
      "version" : "7.0"
    }
  ],
  "products" : [
    {
      "name" : "ControlledChaos",
      "targets" : [
        "ControlledChaos"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ControlledChaosTests",
      "module_type" : "SwiftTarget",
      "name" : "ControlledChaosTests",
      "path" : "Tests/ControlledChaosTests",
      "sources" : [
        "Extensions/BoolRandomProbabilityTests.swift",
        "Extensions/DoubleGaussianTests.swift",
        "ProbabilityGroupTests.swift",
        "RandomItemBagTests.swift",
        "SeededRandomNumberGeneratorTests.swift"
      ],
      "target_dependencies" : [
        "ControlledChaos"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ControlledChaos",
      "module_type" : "SwiftTarget",
      "name" : "ControlledChaos",
      "path" : "Sources/ControlledChaos",
      "product_memberships" : [
        "ControlledChaos"
      ],
      "sources" : [
        "Extensions/Bool+randomProbability.swift",
        "Extensions/Double+randomGaussian.swift",
        "ProbabilityGroup.swift",
        "RandomItemBag.swift",
        "SeededRandomNumberGenerator.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
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
[3/8] Compiling ControlledChaos RandomItemBag.swift
[4/8] Compiling ControlledChaos SeededRandomNumberGenerator.swift
[5/8] Compiling ControlledChaos ProbabilityGroup.swift
[6/8] Compiling ControlledChaos Bool+randomProbability.swift
[7/8] Emitting module ControlledChaos
/Users/admin/builder/spi-builder-workspace/Sources/ControlledChaos/Extensions/Double+randomGaussian.swift:7:24: warning: static property '_queudGaussian' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 5 | extension Double {
 6 |
 7 |     private static var _queudGaussian: Double?
   |                        |- warning: static property '_queudGaussian' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                        |- note: convert '_queudGaussian' to a 'let' constant to make 'Sendable' shared state immutable
   |                        |- note: add '@MainActor' to make static property '_queudGaussian' part of global actor 'MainActor'
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 8 |
 9 |     /**
[8/8] Compiling ControlledChaos Double+randomGaussian.swift
/Users/admin/builder/spi-builder-workspace/Sources/ControlledChaos/Extensions/Double+randomGaussian.swift:7:24: warning: static property '_queudGaussian' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 5 | extension Double {
 6 |
 7 |     private static var _queudGaussian: Double?
   |                        |- warning: static property '_queudGaussian' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                        |- note: convert '_queudGaussian' to a 'let' constant to make 'Sendable' shared state immutable
   |                        |- note: add '@MainActor' to make static property '_queudGaussian' part of global actor 'MainActor'
   |                        `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 8 |
 9 |     /**
Build complete! (4.32s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ControlledChaos",
  "name" : "ControlledChaos",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "11.0"
    },
    {
      "name" : "ios",
      "version" : "14.0"
    },
    {
      "name" : "tvos",
      "version" : "14.0"
    },
    {
      "name" : "watchos",
      "version" : "7.0"
    }
  ],
  "products" : [
    {
      "name" : "ControlledChaos",
      "targets" : [
        "ControlledChaos"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ControlledChaosTests",
      "module_type" : "SwiftTarget",
      "name" : "ControlledChaosTests",
      "path" : "Tests/ControlledChaosTests",
      "sources" : [
        "Extensions/BoolRandomProbabilityTests.swift",
        "Extensions/DoubleGaussianTests.swift",
        "ProbabilityGroupTests.swift",
        "RandomItemBagTests.swift",
        "SeededRandomNumberGeneratorTests.swift"
      ],
      "target_dependencies" : [
        "ControlledChaos"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ControlledChaos",
      "module_type" : "SwiftTarget",
      "name" : "ControlledChaos",
      "path" : "Sources/ControlledChaos",
      "product_memberships" : [
        "ControlledChaos"
      ],
      "sources" : [
        "Extensions/Bool+randomProbability.swift",
        "Extensions/Double+randomGaussian.swift",
        "ProbabilityGroup.swift",
        "RandomItemBag.swift",
        "SeededRandomNumberGenerator.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.7"
}
Done.