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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 PackageConfig, reference 1.1.3 (585231), with Swift 6.1 for macOS (SPM) on 26 Apr 2025 19:08:13 UTC.

Swift 6 data race errors: 2

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/shibapm/packageconfig.git
Reference: 1.1.3
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/shibapm/packageconfig
 * tag               1.1.3      -> FETCH_HEAD
HEAD is now at 5852319 Merge pull request #27 from minuscorp/rename-example-product
Cloned https://github.com/shibapm/packageconfig.git
Revision (git rev-parse @):
58523193c26fb821ed1720dcd8a21009055c7cdb
SUCCESS checkout https://github.com/shibapm/packageconfig.git at 1.1.3
========================================
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": "packageconfig",
      "name": "PackageConfig",
      "url": "https://github.com/shibapm/packageconfig.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/packageconfig",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/shibapm/packageconfig.git
[1/580] Fetching packageconfig
Fetched https://github.com/shibapm/packageconfig.git from cache (0.76s)
Creating working copy for https://github.com/shibapm/packageconfig.git
Working copy of https://github.com/shibapm/packageconfig.git resolved at 1.1.3 (5852319)
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/shibapm/packageconfig.git
https://github.com/shibapm/packageconfig.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "PackageConfig",
  "name" : "PackageConfig",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "PackageConfig",
      "targets" : [
        "PackageConfig"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    },
    {
      "name" : "package-config",
      "targets" : [
        "PackageConfigExecutable"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "ExampleConfig",
      "targets" : [
        "ExampleConfig"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    },
    {
      "name" : "package-config-example",
      "targets" : [
        "ExampleMain"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PackageConfigs",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfigs",
      "path" : "Sources/PackageConfigs",
      "sources" : [
        "PackageConfigs.swift"
      ],
      "target_dependencies" : [
        "ExampleConfig"
      ],
      "type" : "library"
    },
    {
      "c99name" : "PackageConfigExecutable",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfigExecutable",
      "path" : "Sources/PackageConfigExecutable",
      "product_memberships" : [
        "package-config"
      ],
      "sources" : [
        "main.swift"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "PackageConfig",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfig",
      "path" : "Sources/PackageConfig",
      "product_memberships" : [
        "PackageConfig",
        "ExampleConfig",
        "package-config-example"
      ],
      "sources" : [
        "DynamicLibraries.swift",
        "Error.swift",
        "Loader.swift",
        "Package.swift",
        "PackageConfig.swift",
        "PackageConfiguration.swift",
        "Writer.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "ExampleMain",
      "module_type" : "SwiftTarget",
      "name" : "ExampleMain",
      "path" : "Sources/ExampleMain",
      "product_memberships" : [
        "package-config-example"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "PackageConfig",
        "ExampleConfig"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "ExampleConfig",
      "module_type" : "SwiftTarget",
      "name" : "ExampleConfig",
      "path" : "Sources/ExampleConfig",
      "product_memberships" : [
        "ExampleConfig",
        "package-config-example"
      ],
      "sources" : [
        "ExampleConfig.swift"
      ],
      "target_dependencies" : [
        "PackageConfig"
      ],
      "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...
[0/18] Write sources
[5/18] Write package-config-entitlement.plist
[5/18] Write package-config-example-entitlement.plist
[7/18] Write swift-version-2F0A5646E1D333AE.txt
[9/28] Emitting module PackageConfigExecutable
[10/28] Compiling PackageConfigExecutable main.swift
[11/28] Compiling PackageConfig Package.swift
[12/28] Compiling PackageConfig PackageConfig.swift
[13/28] Compiling PackageConfig PackageConfiguration.swift
/Users/admin/builder/spi-builder-workspace/Sources/PackageConfig/PackageConfiguration.swift:4:23: warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  2 |
  3 | public struct PackageConfiguration: PackageConfig {
  4 |     public static var fileName: String = "package-config"
    |                       |- warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'fileName' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'fileName' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  5 |
  6 |     public let configuration: [String: Any]
[14/28] Compiling PackageConfig DynamicLibraries.swift
[15/28] Emitting module PackageConfig
/Users/admin/builder/spi-builder-workspace/Sources/PackageConfig/PackageConfiguration.swift:4:23: warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  2 |
  3 | public struct PackageConfiguration: PackageConfig {
  4 |     public static var fileName: String = "package-config"
    |                       |- warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'fileName' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'fileName' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  5 |
  6 |     public let configuration: [String: Any]
[16/28] Compiling PackageConfig Error.swift
[17/28] Compiling PackageConfig Loader.swift
[18/28] Compiling PackageConfig Writer.swift
[18/28] Write Objects.LinkFileList
[21/30] Compiling ExampleConfig ExampleConfig.swift
/Users/admin/builder/spi-builder-workspace/Sources/ExampleConfig/ExampleConfig.swift:8:20: warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 6 | 	let value: String
 7 |
 8 | 	public static var fileName: String = "example.config.json"
   |                    |- warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                    |- note: convert 'fileName' to a 'let' constant to make 'Sendable' shared state immutable
   |                    |- note: add '@MainActor' to make static property 'fileName' part of global actor 'MainActor'
   |                    `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 9 |
10 | 	public init(value: String) {
[22/30] Emitting module ExampleConfig
/Users/admin/builder/spi-builder-workspace/Sources/ExampleConfig/ExampleConfig.swift:8:20: warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 6 | 	let value: String
 7 |
 8 | 	public static var fileName: String = "example.config.json"
   |                    |- warning: static property 'fileName' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
   |                    |- note: convert 'fileName' to a 'let' constant to make 'Sendable' shared state immutable
   |                    |- note: add '@MainActor' to make static property 'fileName' part of global actor 'MainActor'
   |                    `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 9 |
10 | 	public init(value: String) {
[22/30] Write Objects.LinkFileList
[23/30] Linking package-config
[24/30] Linking libPackageConfig.dylib
[25/30] Applying package-config
[27/34] Compiling PackageConfigs PackageConfigs.swift
[28/34] Emitting module PackageConfigs
[29/34] Compiling ExampleMain main.swift
[30/34] Emitting module ExampleMain
[30/34] Write Objects.LinkFileList
[31/34] Linking libExampleConfig.dylib
[32/34] Linking package-config-example
[33/34] Applying package-config-example
Build complete! (5.28s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "PackageConfig",
  "name" : "PackageConfig",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "PackageConfig",
      "targets" : [
        "PackageConfig"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    },
    {
      "name" : "package-config",
      "targets" : [
        "PackageConfigExecutable"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "ExampleConfig",
      "targets" : [
        "ExampleConfig"
      ],
      "type" : {
        "library" : [
          "dynamic"
        ]
      }
    },
    {
      "name" : "package-config-example",
      "targets" : [
        "ExampleMain"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PackageConfigs",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfigs",
      "path" : "Sources/PackageConfigs",
      "sources" : [
        "PackageConfigs.swift"
      ],
      "target_dependencies" : [
        "ExampleConfig"
      ],
      "type" : "library"
    },
    {
      "c99name" : "PackageConfigExecutable",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfigExecutable",
      "path" : "Sources/PackageConfigExecutable",
      "product_memberships" : [
        "package-config"
      ],
      "sources" : [
        "main.swift"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "PackageConfig",
      "module_type" : "SwiftTarget",
      "name" : "PackageConfig",
      "path" : "Sources/PackageConfig",
      "product_memberships" : [
        "PackageConfig",
        "ExampleConfig",
        "package-config-example"
      ],
      "sources" : [
        "DynamicLibraries.swift",
        "Error.swift",
        "Loader.swift",
        "Package.swift",
        "PackageConfig.swift",
        "PackageConfiguration.swift",
        "Writer.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "ExampleMain",
      "module_type" : "SwiftTarget",
      "name" : "ExampleMain",
      "path" : "Sources/ExampleMain",
      "product_memberships" : [
        "package-config-example"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "PackageConfig",
        "ExampleConfig"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "ExampleConfig",
      "module_type" : "SwiftTarget",
      "name" : "ExampleConfig",
      "path" : "Sources/ExampleConfig",
      "product_memberships" : [
        "ExampleConfig",
        "package-config-example"
      ],
      "sources" : [
        "ExampleConfig.swift"
      ],
      "target_dependencies" : [
        "PackageConfig"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Done.