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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 Footprint, reference main (0d12b5), with Swift 6.0 for macOS (SPM) on 12 Apr 2025 22:24:57 UTC.

Swift 6 data race errors: 0

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.2.0.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: 4.60.1
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/naftaly/Footprint.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/naftaly/Footprint
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 0d12b57 Update Footprint.swift
Cloned https://github.com/naftaly/Footprint.git
Revision (git rev-parse @):
0d12b576ff3953d17dcc9840bdef66a56e273a4a
SUCCESS checkout https://github.com/naftaly/Footprint.git at main
========================================
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": "footprint",
      "name": "Footprint",
      "url": "https://github.com/naftaly/Footprint.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Footprint",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/naftaly/Footprint.git
[1/143] Fetching footprint
Fetched https://github.com/naftaly/Footprint.git from cache (0.56s)
Creating working copy for https://github.com/naftaly/Footprint.git
Working copy of https://github.com/naftaly/Footprint.git resolved at main (0d12b57)
warning: '.resolve-product-dependencies': dependency 'footprint' 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/naftaly/Footprint.git
https://github.com/naftaly/Footprint.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Footprint",
  "name" : "Footprint",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Footprint",
      "targets" : [
        "Footprint"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "FootprintTests",
      "module_type" : "SwiftTarget",
      "name" : "FootprintTests",
      "path" : "Tests/FootprintTests",
      "sources" : [
        "FootprintTests.swift"
      ],
      "target_dependencies" : [
        "Footprint"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Footprint",
      "module_type" : "SwiftTarget",
      "name" : "Footprint",
      "path" : "Sources/Footprint",
      "product_memberships" : [
        "Footprint"
      ],
      "sources" : [
        "DefaultMemoryProvider.swift",
        "Footprint.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.2.0.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-5BDAB9E9C0126B9D.txt
[3/5] Compiling Footprint Footprint.swift
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/Footprint.swift:246:13: warning: capture of 'action' with non-sendable type '(Footprint.Memory) -> Void' in a `@Sendable` closure
244 |         }
245 |         DispatchQueue.global().async {
246 |             action(mem)
    |             |- warning: capture of 'action' with non-sendable type '(Footprint.Memory) -> Void' in a `@Sendable` closure
    |             `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
247 |         }
248 |     }
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/Footprint.swift:246:20: warning: capture of 'mem' with non-sendable type 'Footprint.Memory' in a `@Sendable` closure
 37 |     /// A structure that represents the different values required for easier memory
 38 |     /// handling throughout your apps lifetime.
 39 |     public struct Memory {
    |                   `- note: consider making struct 'Memory' conform to the 'Sendable' protocol
 40 |
 41 |         /// State describes how close to app termination your app is based on memory.
    :
244 |         }
245 |         DispatchQueue.global().async {
246 |             action(mem)
    |                    `- warning: capture of 'mem' with non-sendable type 'Footprint.Memory' in a `@Sendable` closure
247 |         }
248 |     }
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/Footprint.swift:300:45: warning: sending 'memory' risks causing data races; this is an error in the Swift 6 language mode
298 |             DispatchQueue.main.async {
299 |                 NotificationCenter.default.post(name: Footprint.memoryDidChangeNotification, object: nil, userInfo: [
300 |                     Footprint.newMemoryKey: memory,
    |                                             |- warning: sending 'memory' risks causing data races; this is an error in the Swift 6 language mode
    |                                             `- note: task-isolated 'memory' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
301 |                     Footprint.oldMemoryKey: oldMemory,
302 |                     Footprint.changesKey: changeSet,
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/Footprint.swift:301:45: warning: sending 'oldMemory' risks causing data races; this is an error in the Swift 6 language mode
299 |                 NotificationCenter.default.post(name: Footprint.memoryDidChangeNotification, object: nil, userInfo: [
300 |                     Footprint.newMemoryKey: memory,
301 |                     Footprint.oldMemoryKey: oldMemory,
    |                                             |- warning: sending 'oldMemory' risks causing data races; this is an error in the Swift 6 language mode
    |                                             `- note: task-isolated 'oldMemory' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
302 |                     Footprint.changesKey: changeSet,
303 |                 ])
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/Footprint.swift:302:43: warning: sending 'changeSet' risks causing data races; this is an error in the Swift 6 language mode
300 |                     Footprint.newMemoryKey: memory,
301 |                     Footprint.oldMemoryKey: oldMemory,
302 |                     Footprint.changesKey: changeSet,
    |                                           |- warning: sending 'changeSet' risks causing data races; this is an error in the Swift 6 language mode
    |                                           `- note: task-isolated 'changeSet' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
303 |                 ])
304 |             }
[4/5] Emitting module Footprint
[5/5] Compiling Footprint DefaultMemoryProvider.swift
/Users/admin/builder/spi-builder-workspace/Sources/Footprint/DefaultMemoryProvider.swift:21:31: warning: reference to var 'mach_task_self_' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
19 |             let kerr = withUnsafeMutablePointer(to: &info) {
20 |                 $0.withMemoryRebound(to: integer_t.self, capacity: 1) {
21 |                     task_info(mach_task_self_, thread_flavor_t(TASK_VM_INFO), $0, &infoCount)
   |                               `- warning: reference to var 'mach_task_self_' is not concurrency-safe because it involves shared mutable state; this is an error in the Swift 6 language mode
22 |                 }
23 |             }
Darwin.mach_task_self_:1:12: note: var declared here
1 | public var mach_task_self_: mach_port_t
  |            `- note: var declared here
Build complete! (11.62s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Footprint",
  "name" : "Footprint",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Footprint",
      "targets" : [
        "Footprint"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "FootprintTests",
      "module_type" : "SwiftTarget",
      "name" : "FootprintTests",
      "path" : "Tests/FootprintTests",
      "sources" : [
        "FootprintTests.swift"
      ],
      "target_dependencies" : [
        "Footprint"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Footprint",
      "module_type" : "SwiftTarget",
      "name" : "Footprint",
      "path" : "Sources/Footprint",
      "product_memberships" : [
        "Footprint"
      ],
      "sources" : [
        "DefaultMemoryProvider.swift",
        "Footprint.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
Done.