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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 DNS, reference master (d04ab5), with Swift 6.1 for Linux on 25 Apr 2025 10:01:23 UTC.

Swift 6 data race errors: 1

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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/bouke/dns.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/bouke/dns
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at d04ab56 Add support for MX records (#32)
Cloned https://github.com/bouke/dns.git
Revision (git rev-parse @):
d04ab56ce1e4d889c920b9dcc1f30b3fb4880837
SUCCESS checkout https://github.com/bouke/dns.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/bouke/dns.git
https://github.com/bouke/dns.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DNS",
  "name" : "DNS",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "DNS",
      "targets" : [
        "DNS"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DNSTests",
      "module_type" : "SwiftTarget",
      "name" : "DNSTests",
      "path" : "Tests/DNSTests",
      "sources" : [
        "DNSTests.swift",
        "FuzzTests.swift",
        "IPTests.swift"
      ],
      "target_dependencies" : [
        "DNS"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DNS",
      "module_type" : "SwiftTarget",
      "name" : "DNS",
      "path" : "Sources/DNS",
      "product_memberships" : [
        "DNS"
      ],
      "sources" : [
        "Bytes.swift",
        "Data+Extensions.swift",
        "IP.swift",
        "Integer+Data.swift",
        "Message.swift",
        "Types.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$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
[3/9] Emitting module DNS
/host/spi-builder-workspace/Sources/DNS/Types.swift:55:1: warning: extension declares a conformance of imported type 'UInt16' to imported protocol 'CustomDebugStringConvertible'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
 53 | }
 54 |
 55 | extension ResourceRecordType: CustomDebugStringConvertible {
    | |- warning: extension declares a conformance of imported type 'UInt16' to imported protocol 'CustomDebugStringConvertible'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
    | `- note: add '@retroactive' to silence this warning
 56 |     public var debugDescription: String {
 57 |         switch self {
/host/spi-builder-workspace/Sources/DNS/Types.swift:182:27: warning: generic parameter 'IPType' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
158 | }
159 |
160 | public struct HostRecord<IPType: IP> {
    |                          `- note: 'IPType' previously declared here
161 |     public var name: String
162 |     public var unique: Bool
    :
180 |     }
181 |
182 |     public static func ==<IPType> (lhs: HostRecord<IPType>, rhs: HostRecord<IPType>) -> Bool {
    |                           `- warning: generic parameter 'IPType' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
183 |         return lhs.name == rhs.name
184 |         // TODO: check equality of IP addresses
[4/9] Compiling DNS IP.swift
[5/9] Compiling DNS Data+Extensions.swift
[6/9] Compiling DNS Message.swift
[7/9] Compiling DNS Integer+Data.swift
[8/9] Compiling DNS Types.swift
/host/spi-builder-workspace/Sources/DNS/Types.swift:55:1: warning: extension declares a conformance of imported type 'UInt16' to imported protocol 'CustomDebugStringConvertible'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
 53 | }
 54 |
 55 | extension ResourceRecordType: CustomDebugStringConvertible {
    | |- warning: extension declares a conformance of imported type 'UInt16' to imported protocol 'CustomDebugStringConvertible'; this will not behave correctly if the owners of 'Swift' introduce this conformance in the future
    | `- note: add '@retroactive' to silence this warning
 56 |     public var debugDescription: String {
 57 |         switch self {
/host/spi-builder-workspace/Sources/DNS/Types.swift:182:27: warning: generic parameter 'IPType' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
158 | }
159 |
160 | public struct HostRecord<IPType: IP> {
    |                          `- note: 'IPType' previously declared here
161 |     public var name: String
162 |     public var unique: Bool
    :
180 |     }
181 |
182 |     public static func ==<IPType> (lhs: HostRecord<IPType>, rhs: HostRecord<IPType>) -> Bool {
    |                           `- warning: generic parameter 'IPType' shadows generic parameter from outer scope with the same name; this is an error in the Swift 6 language mode
183 |         return lhs.name == rhs.name
184 |         // TODO: check equality of IP addresses
[9/9] Compiling DNS Bytes.swift
Build complete! (13.63s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DNS",
  "name" : "DNS",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "DNS",
      "targets" : [
        "DNS"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "swift_languages_versions" : [
    "4",
    "5"
  ],
  "targets" : [
    {
      "c99name" : "DNSTests",
      "module_type" : "SwiftTarget",
      "name" : "DNSTests",
      "path" : "Tests/DNSTests",
      "sources" : [
        "DNSTests.swift",
        "FuzzTests.swift",
        "IPTests.swift"
      ],
      "target_dependencies" : [
        "DNS"
      ],
      "type" : "test"
    },
    {
      "c99name" : "DNS",
      "module_type" : "SwiftTarget",
      "name" : "DNS",
      "path" : "Sources/DNS",
      "product_memberships" : [
        "DNS"
      ],
      "sources" : [
        "Bytes.swift",
        "Data+Extensions.swift",
        "IP.swift",
        "Integer+Data.swift",
        "Message.swift",
        "Types.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.