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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 ServerSecurity, reference master (e3d6b1), with Swift 6.1 for Linux on 25 Apr 2025 08:35:19 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/swift-server/security.git
Reference: master
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/swift-server/security
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at e3d6b11 Update README.md
Cloned https://github.com/swift-server/security.git
Revision (git rev-parse @):
e3d6b11e308b0a88db72ba837af641e489d3e0c6
SUCCESS checkout https://github.com/swift-server/security.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/swift-server/security.git
https://github.com/swift-server/security.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ServerSecurity",
  "name" : "ServerSecurity",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ServerSecurity",
      "targets" : [
        "ServerSecurity"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ServerSecurity",
      "module_type" : "SwiftTarget",
      "name" : "ServerSecurity",
      "path" : "Sources/ServerSecurity",
      "product_memberships" : [
        "ServerSecurity"
      ],
      "sources" : [
        "Connection-Protocol.swift",
        "TLSConfiguration.swift",
        "TLSError.swift",
        "TLSService-Protocol.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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
[3/7] Compiling ServerSecurity TLSError.swift
/host/spi-builder-workspace/Sources/ServerSecurity/TLSError.swift:37:24: warning: enum case 'fail' has 2 associated values
22 |
23 |     /// Failure with error code and reason
24 |     case fail(Int, String)
   |          `- note: 'fail' declared here
25 |
26 |     /// The error code itself
   :
35 |             return -1
36 |
37 |         case .fail(let (code, _)):
   |                        `- warning: enum case 'fail' has 2 associated values
38 |             return Int(code)
39 |         }
/host/spi-builder-workspace/Sources/ServerSecurity/TLSError.swift:53:24: warning: enum case 'fail' has 2 associated values
22 |
23 |     /// Failure with error code and reason
24 |     case fail(Int, String)
   |          `- note: 'fail' declared here
25 |
26 |     /// The error code itself
   :
51 |             return "Retry operation"
52 |
53 |         case .fail(let (_, reason)):
   |                        `- warning: enum case 'fail' has 2 associated values
54 |             return reason
55 |         }
[4/7] Compiling ServerSecurity TLSService-Protocol.swift
[5/7] Emitting module ServerSecurity
/host/spi-builder-workspace/Sources/ServerSecurity/TLSConfiguration.swift:19:23: warning: static property 'maxTLSRecordLength' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 17 |
 18 |     // Max size of TLS record in Bytes
 19 |     public static var maxTLSRecordLength: Int = 16384
    |                       |- warning: static property 'maxTLSRecordLength' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'maxTLSRecordLength' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'maxTLSRecordLength' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 20 | }
 21 |
[6/7] Compiling ServerSecurity TLSConfiguration.swift
/host/spi-builder-workspace/Sources/ServerSecurity/TLSConfiguration.swift:19:23: warning: static property 'maxTLSRecordLength' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
 17 |
 18 |     // Max size of TLS record in Bytes
 19 |     public static var maxTLSRecordLength: Int = 16384
    |                       |- warning: static property 'maxTLSRecordLength' is not concurrency-safe because it is nonisolated global shared mutable state; this is an error in the Swift 6 language mode
    |                       |- note: convert 'maxTLSRecordLength' to a 'let' constant to make 'Sendable' shared state immutable
    |                       |- note: add '@MainActor' to make static property 'maxTLSRecordLength' part of global actor 'MainActor'
    |                       `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 20 | }
 21 |
[7/7] Compiling ServerSecurity Connection-Protocol.swift
Build complete! (6.98s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ServerSecurity",
  "name" : "ServerSecurity",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "ServerSecurity",
      "targets" : [
        "ServerSecurity"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "ServerSecurity",
      "module_type" : "SwiftTarget",
      "name" : "ServerSecurity",
      "path" : "Sources/ServerSecurity",
      "product_memberships" : [
        "ServerSecurity"
      ],
      "sources" : [
        "Connection-Protocol.swift",
        "TLSConfiguration.swift",
        "TLSError.swift",
        "TLSService-Protocol.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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.