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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 6.0 for macOS (SPM) on 31 Oct 2024 00:38:12 UTC.

Swift 6 data race errors: 2

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.56.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/bouke/dns.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
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
========================================
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": "dns",
      "name": "DNS",
      "url": "https://github.com/bouke/dns.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/dns",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/bouke/dns.git
[10/908] Fetching dns
Fetched https://github.com/bouke/dns.git from cache (0.98s)
Creating working copy for https://github.com/bouke/dns.git
Working copy of https://github.com/bouke/dns.git resolved at master (d04ab56)
warning: '.resolve-product-dependencies': dependency 'dns' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/bouke/dns.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--7754E27361AE5C74.txt
[3/9] Compiling DNS Message.swift
[4/9] Compiling DNS Integer+Data.swift
[5/9] Compiling DNS IP.swift
<unknown>:0: note: a function type must be marked '@Sendable' to conform to 'Sendable'
/Users/admin/builder/spi-builder-workspace/Sources/DNS/IP.swift:9:5: warning: let 'ntohl' is not concurrency-safe because non-'Sendable' type '(UInt32) -> UInt32' may have shared mutable state; this is an error in the Swift 6 language mode
  7 |     return value.byteSwapped
  8 | }
  9 | let ntohl = htonl
    |     |- warning: let 'ntohl' is not concurrency-safe because non-'Sendable' type '(UInt32) -> UInt32' may have shared mutable state; this is an error in the Swift 6 language mode
    |     |- note: annotate 'ntohl' with '@MainActor' if property should only be accessed from the main actor
    |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 10 |
 11 | public protocol IP: CustomDebugStringConvertible {
[6/9] Compiling DNS Data+Extensions.swift
[7/9] Emitting module DNS
<unknown>:0: note: a function type must be marked '@Sendable' to conform to 'Sendable'
/Users/admin/builder/spi-builder-workspace/Sources/DNS/IP.swift:9:5: warning: let 'ntohl' is not concurrency-safe because non-'Sendable' type '(UInt32) -> UInt32' may have shared mutable state; this is an error in the Swift 6 language mode
  7 |     return value.byteSwapped
  8 | }
  9 | let ntohl = htonl
    |     |- warning: let 'ntohl' is not concurrency-safe because non-'Sendable' type '(UInt32) -> UInt32' may have shared mutable state; this is an error in the Swift 6 language mode
    |     |- note: annotate 'ntohl' with '@MainActor' if property should only be accessed from the main actor
    |     `- note: disable concurrency-safety checks if accesses are protected by an external synchronization mechanism
 10 |
 11 | public protocol IP: CustomDebugStringConvertible {
/Users/admin/builder/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 {
/Users/admin/builder/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
[8/9] Compiling DNS Types.swift
/Users/admin/builder/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 {
/Users/admin/builder/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! (8.09s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "DNS",
  "name" : "DNS",
  "path" : "/Users/admin/builder/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"
}
Done.