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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 Linux on 27 Apr 2025 04:46:07 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1

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 /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
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
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/jordanbaird/Restore.git
https://github.com/jordanbaird/Restore.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "Restore",
  "name" : "Restore",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Restore",
      "targets" : [
        "Restore"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RestoreTests",
      "module_type" : "SwiftTarget",
      "name" : "RestoreTests",
      "path" : "Tests/RestoreTests",
      "sources" : [
        "PropertiesTests.swift",
        "RestorableTests.swift"
      ],
      "target_dependencies" : [
        "Restore"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Restore",
      "module_type" : "SwiftTarget",
      "name" : "Restore",
      "path" : "Sources/Restore",
      "product_memberships" : [
        "Restore"
      ],
      "sources" : [
        "ErrorHandling.swift",
        "Identity.swift",
        "Properties.swift",
        "Reference.swift",
        "Restorable.swift",
        "RestorableObject.swift",
        "RestorationKey.swift",
        "Snapshot.swift",
        "Utilities.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-2":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://github.com/apple/swift-docc-plugin
[1/2049] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (0.37s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.3 (1.52s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3375] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.37s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (1.23s)
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
[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-24593BA9C3E375BF.txt
[5/13] Compiling Restore Snapshot.swift
[6/14] Compiling Restore RestorationKey.swift
[7/14] Compiling Restore Reference.swift
[8/14] Compiling Restore Properties.swift
[9/14] Emitting module Restore
/host/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.
[10/14] Compiling Restore ErrorHandling.swift
[11/14] Compiling Restore Identity.swift
[12/14] Compiling Restore Restorable.swift
[13/14] Compiling Restore RestorableObject.swift
/host/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 Utilities.swift
Build complete! (22.83s)
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" : "/host/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"
}
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Done.