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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 Restore, reference main (d502e0), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 04:50:16 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/jordanbaird/Restore.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/jordanbaird/Restore
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at d502e06 Update file headers
Cloned https://github.com/jordanbaird/Restore.git
Revision (git rev-parse @):
d502e06bd7b4d74af1b1bfaedb06b926b9bee748
SUCCESS checkout https://github.com/jordanbaird/Restore.git at main
Fetching https://github.com/apple/swift-docc-plugin
[1/2049] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (1.13s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.3 (1.73s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit from cache
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.73s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (1.40s)
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.4.3
========================================
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": "restore",
      "name": "Restore",
      "url": "https://github.com/jordanbaird/Restore.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Restore",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/jordanbaird/Restore.git
[1/406] Fetching restore
Fetched https://github.com/jordanbaird/Restore.git from cache (0.79s)
Creating working copy for https://github.com/jordanbaird/Restore.git
Working copy of https://github.com/jordanbaird/Restore.git resolved at main (d502e06)
warning: '.resolve-product-dependencies': dependency 'restore' 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/jordanbaird/Restore.git
https://github.com/jordanbaird/Restore.git
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "Restore",
  "name" : "Restore",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Restore",
      "targets" : [
        "Restore"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RestoreTests",
      "module_type" : "SwiftTarget",
      "name" : "RestoreTests",
      "path" : "Tests/RestoreTests",
      "sources" : [
        "PropertiesTests.swift",
        "RestorableTests.swift"
      ],
      "target_dependencies" : [
        "Restore"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Restore",
      "module_type" : "SwiftTarget",
      "name" : "Restore",
      "path" : "Sources/Restore",
      "product_memberships" : [
        "Restore"
      ],
      "sources" : [
        "ErrorHandling.swift",
        "Identity.swift",
        "Properties.swift",
        "Reference.swift",
        "Restorable.swift",
        "RestorableObject.swift",
        "RestorationKey.swift",
        "Snapshot.swift",
        "Utilities.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
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
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/4] Write sources
[3/4] Write swift-version-2F0A5646E1D333AE.txt
[5/14] Compiling Restore Utilities.swift
[6/14] Compiling Restore RestorationKey.swift
[7/14] Compiling Restore Restorable.swift
[8/14] Compiling Restore Snapshot.swift
[9/14] Compiling Restore Reference.swift
[10/14] Compiling Restore Properties.swift
[11/14] Compiling Restore Identity.swift
[12/14] Compiling Restore ErrorHandling.swift
[13/14] Emitting module Restore
/Users/admin/builder/spi-builder-workspace/Sources/Restore/RestorableObject.swift:6:5: warning: var 'storage' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  4 | //
  5 |
  6 | var storage = [Identifier: [RestorationKey: AnySnapshot]]()
    |     |- warning: var 'storage' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |     |- note: convert 'storage' to a 'let' constant to make 'Sendable' shared state immutable
    |     |- note: add '@MainActor' to make var 'storage' part of global actor 'MainActor'
    |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  7 |
  8 | /// A type that can be stored and restored from a snapshot.
[14/14] Compiling Restore RestorableObject.swift
/Users/admin/builder/spi-builder-workspace/Sources/Restore/RestorableObject.swift:6:5: warning: var 'storage' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
  4 | //
  5 |
  6 | var storage = [Identifier: [RestorationKey: AnySnapshot]]()
    |     |- warning: var 'storage' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |     |- note: convert 'storage' to a 'let' constant to make 'Sendable' shared state immutable
    |     |- note: add '@MainActor' to make var 'storage' part of global actor 'MainActor'
    |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
  7 |
  8 | /// A type that can be stored and restored from a snapshot.
Build complete! (10.64s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "Restore",
  "name" : "Restore",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Restore",
      "targets" : [
        "Restore"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RestoreTests",
      "module_type" : "SwiftTarget",
      "name" : "RestoreTests",
      "path" : "Tests/RestoreTests",
      "sources" : [
        "PropertiesTests.swift",
        "RestorableTests.swift"
      ],
      "target_dependencies" : [
        "Restore"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Restore",
      "module_type" : "SwiftTarget",
      "name" : "Restore",
      "path" : "Sources/Restore",
      "product_memberships" : [
        "Restore"
      ],
      "sources" : [
        "ErrorHandling.swift",
        "Identity.swift",
        "Properties.swift",
        "Reference.swift",
        "Restorable.swift",
        "RestorableObject.swift",
        "RestorationKey.swift",
        "Snapshot.swift",
        "Utilities.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
Done.