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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 macOS (SPM) on 24 Apr 2025 12:13:48 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/swift-server/security.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
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
========================================
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": "security",
      "name": "ServerSecurity",
      "url": "https://github.com/swift-server/security.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/security",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/swift-server/security.git
[1/135] Fetching security
Fetched https://github.com/swift-server/security.git from cache (0.68s)
Creating working copy for https://github.com/swift-server/security.git
Working copy of https://github.com/swift-server/security.git resolved at master (e3d6b11)
warning: '.resolve-product-dependencies': dependency 'security' 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/swift-server/security.git
https://github.com/swift-server/security.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ServerSecurity",
  "name" : "ServerSecurity",
  "path" : "/Users/admin/builder/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 ...
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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-2F0A5646E1D333AE.txt
[3/7] Compiling ServerSecurity TLSService-Protocol.swift
[4/7] Compiling ServerSecurity TLSError.swift
/Users/admin/builder/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 |         }
/Users/admin/builder/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 |         }
[5/7] Compiling ServerSecurity Connection-Protocol.swift
[6/7] Emitting module ServerSecurity
/Users/admin/builder/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 TLSConfiguration.swift
/Users/admin/builder/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 |
Build complete! (4.33s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "ServerSecurity",
  "name" : "ServerSecurity",
  "path" : "/Users/admin/builder/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"
}
Done.