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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 LRUCache, reference 1.0.7 (542f04), with Swift 6.1 for Linux on 28 Apr 2025 07:34:56 UTC.

Swift 6 data race errors: 0

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/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/nicklockwood/LRUCache.git
Reference: 1.0.7
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/nicklockwood/LRUCache
 * tag               1.0.7      -> FETCH_HEAD
HEAD is now at 542f044 Update for 1.0.7 release
Cloned https://github.com/nicklockwood/LRUCache.git
Revision (git rev-parse @):
542f0449556327415409ededc9c43a4bd0a397dc
SUCCESS checkout https://github.com/nicklockwood/LRUCache.git at 1.0.7
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/nicklockwood/LRUCache.git
https://github.com/nicklockwood/LRUCache.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LRUCache",
  "name" : "LRUCache",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LRUCache",
      "targets" : [
        "LRUCache"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LRUCacheTests",
      "module_type" : "SwiftTarget",
      "name" : "LRUCacheTests",
      "path" : "Tests",
      "sources" : [
        "LRUCacheTests.swift",
        "LRUPerformanceTests.swift",
        "MetadataTests.swift"
      ],
      "target_dependencies" : [
        "LRUCache"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LRUCache",
      "module_type" : "SwiftTarget",
      "name" : "LRUCache",
      "path" : "Sources",
      "product_memberships" : [
        "LRUCache"
      ],
      "sources" : [
        "LRUCache.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/4] Compiling LRUCache LRUCache.swift
/host/spi-builder-workspace/Sources/LRUCache.swift:88:13: warning: capture of 'self' with non-sendable type 'LRUCache<Key, Value>?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 49 | #endif
 50 |
 51 | public final class LRUCache<Key: Hashable, Value> {
    |                    `- note: generic class 'LRUCache' does not conform to the 'Sendable' protocol
 52 |     private var values: [Key: Container] = [:]
 53 |     private unowned(unsafe) var head: Container?
    :
 86 |             queue: nil
 87 |         ) { [weak self] _ in
 88 |             self?.removeAllValues()
    |             `- warning: capture of 'self' with non-sendable type 'LRUCache<Key, Value>?' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 89 |         }
 90 |     }
[4/4] Emitting module LRUCache
Build complete! (5.37s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "LRUCache",
  "name" : "LRUCache",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "LRUCache",
      "targets" : [
        "LRUCache"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LRUCacheTests",
      "module_type" : "SwiftTarget",
      "name" : "LRUCacheTests",
      "path" : "Tests",
      "sources" : [
        "LRUCacheTests.swift",
        "LRUPerformanceTests.swift",
        "MetadataTests.swift"
      ],
      "target_dependencies" : [
        "LRUCache"
      ],
      "type" : "test"
    },
    {
      "c99name" : "LRUCache",
      "module_type" : "SwiftTarget",
      "name" : "LRUCache",
      "path" : "Sources",
      "product_memberships" : [
        "LRUCache"
      ],
      "sources" : [
        "LRUCache.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
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
Done.