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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 ManualResume, reference main (07604c), with Swift 6.1 for Linux on 28 Apr 2025 07:58:36 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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/mrtksn/ManualResume.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/mrtksn/ManualResume
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 07604c0 Added some clarifications
Cloned https://github.com/mrtksn/ManualResume.git
Revision (git rev-parse @):
07604c0b8de1b0063e26e15069b71ca8eb889eb1
SUCCESS checkout https://github.com/mrtksn/ManualResume.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/mrtksn/ManualResume.git
https://github.com/mrtksn/ManualResume.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ManualResume",
  "name" : "ManualResume",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "ManualResume",
      "targets" : [
        "ManualResume"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ManualResumeTests",
      "module_type" : "SwiftTarget",
      "name" : "ManualResumeTests",
      "path" : "Tests/ManualResumeTests",
      "sources" : [
        "ManualResumeTests.swift"
      ],
      "target_dependencies" : [
        "ManualResume"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ManualResume",
      "module_type" : "SwiftTarget",
      "name" : "ManualResume",
      "path" : "Sources/ManualResume",
      "product_memberships" : [
        "ManualResume"
      ],
      "sources" : [
        "ManualResume.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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 ManualResume ManualResume.swift
/host/spi-builder-workspace/Sources/ManualResume/ManualResume.swift:18:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ManualResume' may have shared mutable state; this is an error in the Swift 6 language mode
15 | }
16 |
17 | public class ManualResume {
   |              `- note: class 'ManualResume' does not conform to the 'Sendable' protocol
18 |     public static let shared = ManualResume()
   |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ManualResume' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
19 |     private init() {}
20 |
[4/4] Emitting module ManualResume
/host/spi-builder-workspace/Sources/ManualResume/ManualResume.swift:18:23: warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ManualResume' may have shared mutable state; this is an error in the Swift 6 language mode
15 | }
16 |
17 | public class ManualResume {
   |              `- note: class 'ManualResume' does not conform to the 'Sendable' protocol
18 |     public static let shared = ManualResume()
   |                       |- warning: static property 'shared' is not concurrency-safe because non-'Sendable' type 'ManualResume' may have shared mutable state; this is an error in the Swift 6 language mode
   |                       |- note: add '@MainActor' to make static property 'shared' part of global actor 'MainActor'
   |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
19 |     private init() {}
20 |
Build complete! (7.17s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ManualResume",
  "name" : "ManualResume",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "ManualResume",
      "targets" : [
        "ManualResume"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ManualResumeTests",
      "module_type" : "SwiftTarget",
      "name" : "ManualResumeTests",
      "path" : "Tests/ManualResumeTests",
      "sources" : [
        "ManualResumeTests.swift"
      ],
      "target_dependencies" : [
        "ManualResume"
      ],
      "type" : "test"
    },
    {
      "c99name" : "ManualResume",
      "module_type" : "SwiftTarget",
      "name" : "ManualResume",
      "path" : "Sources/ManualResume",
      "product_memberships" : [
        "ManualResume"
      ],
      "sources" : [
        "ManualResume.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
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.