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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 EventSource, reference master (78934b), with Swift 6.0 for macOS (SPM) on 3 Nov 2024 00:28:11 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/inaka/EventSource.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/inaka/EventSource
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 78934b3 Merge pull request #134 from daniel-andersen/master
Cloned https://github.com/inaka/EventSource.git
Revision (git rev-parse @):
78934b361891c7d0fa3d399d128e959f0c94d267
SUCCESS checkout https://github.com/inaka/EventSource.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": "eventsource",
      "name": "EventSource",
      "url": "https://github.com/inaka/EventSource.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/EventSource",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/inaka/EventSource.git
[1/1338] Fetching eventsource
Fetched https://github.com/inaka/EventSource.git from cache (1.43s)
Creating working copy for https://github.com/inaka/EventSource.git
Working copy of https://github.com/inaka/EventSource.git resolved at master (78934b3)
warning: '.resolve-product-dependencies': dependency 'eventsource' 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/inaka/EventSource.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
[3/6] Compiling EventSource EventStreamParser.swift
[4/6] Compiling EventSource Event.swift
[5/6] Emitting module EventSource
/Users/admin/builder/spi-builder-workspace/EventSource/EventSource.swift:76:12: warning: non-final class 'EventSource' cannot conform to 'Sendable'; use '@unchecked Sendable'; this is an error in the Swift 6 language mode
 74 | }
 75 |
 76 | open class EventSource: NSObject, EventSourceProtocol, URLSessionDataDelegate {
    |            `- warning: non-final class 'EventSource' cannot conform to 'Sendable'; use '@unchecked Sendable'; this is an error in the Swift 6 language mode
 77 |     static let DefaultRetryTime = 3000
 78 |
/Users/admin/builder/spi-builder-workspace/EventSource/EventSource.swift:80:29: warning: stored property 'lastEventId' of 'Sendable'-conforming class 'EventSource' is mutable; this is an error in the Swift 6 language mode
 78 |
 79 |     public let url: URL
 80 |     private(set) public var lastEventId: String?
    |                             `- warning: stored property 'lastEventId' of 'Sendable'-conforming class 'EventSource' is mutable; this is an error in the Swift 6 language mode
 81 |     private(set) public var retryTime = EventSource.DefaultRetryTime
 82 |     private(set) public var headers: [String: String]
[6/6] Compiling EventSource EventSource.swift
/Users/admin/builder/spi-builder-workspace/EventSource/EventSource.swift:76:12: warning: non-final class 'EventSource' cannot conform to 'Sendable'; use '@unchecked Sendable'; this is an error in the Swift 6 language mode
 74 | }
 75 |
 76 | open class EventSource: NSObject, EventSourceProtocol, URLSessionDataDelegate {
    |            `- warning: non-final class 'EventSource' cannot conform to 'Sendable'; use '@unchecked Sendable'; this is an error in the Swift 6 language mode
 77 |     static let DefaultRetryTime = 3000
 78 |
/Users/admin/builder/spi-builder-workspace/EventSource/EventSource.swift:80:29: warning: stored property 'lastEventId' of 'Sendable'-conforming class 'EventSource' is mutable; this is an error in the Swift 6 language mode
 78 |
 79 |     public let url: URL
 80 |     private(set) public var lastEventId: String?
    |                             `- warning: stored property 'lastEventId' of 'Sendable'-conforming class 'EventSource' is mutable; this is an error in the Swift 6 language mode
 81 |     private(set) public var retryTime = EventSource.DefaultRetryTime
 82 |     private(set) public var headers: [String: String]
/Users/admin/builder/spi-builder-workspace/EventSource/EventSource.swift:237:35: warning: capture of 'eventHandler' with non-sendable type '(String?, String?, String?) -> Void' in a `@Sendable` closure; this is an error in the Swift 6 language mode
235 |
236 |             if let eventName = event.event, let eventHandler = eventListeners[eventName] {
237 |                 mainQueue.async { eventHandler(event.id, event.event, event.data) }
    |                                   |- warning: capture of 'eventHandler' with non-sendable type '(String?, String?, String?) -> Void' in a `@Sendable` closure; this is an error in the Swift 6 language mode
    |                                   `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
238 |             }
239 |         }
Build complete! (6.35s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "EventSource",
  "name" : "EventSource",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "8.0"
    },
    {
      "name" : "macos",
      "version" : "10.10"
    }
  ],
  "products" : [
    {
      "name" : "EventSource",
      "targets" : [
        "EventSource"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EventSourceTests",
      "module_type" : "SwiftTarget",
      "name" : "EventSourceTests",
      "path" : "EventSourceTests",
      "sources" : [
        "EventSourceTests.swift",
        "EventStreamParserTests.swift",
        "EventTests.swift",
        "Mock/URLSessionDataTaskMock.swift"
      ],
      "target_dependencies" : [
        "EventSource"
      ],
      "type" : "test"
    },
    {
      "c99name" : "EventSource",
      "module_type" : "SwiftTarget",
      "name" : "EventSource",
      "path" : "EventSource",
      "product_memberships" : [
        "EventSource"
      ],
      "sources" : [
        "Event.swift",
        "EventSource.swift",
        "EventStreamParser.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.1"
}
Done.