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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 SwiftCompressor, reference master (af8cb0), with Swift 6.1 for macOS (SPM) on 27 Apr 2025 00:13:09 UTC.

Swift 6 data race errors: 0

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/sochalewski/SwiftCompressor.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/sochalewski/SwiftCompressor
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at af8cb04 Add asynchronous methods
Cloned https://github.com/sochalewski/SwiftCompressor.git
Revision (git rev-parse @):
af8cb043f646849d67bf6310c7bf6a9ab3c0dd07
SUCCESS checkout https://github.com/sochalewski/SwiftCompressor.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": "swiftcompressor",
      "name": "SwiftCompressor",
      "url": "https://github.com/sochalewski/SwiftCompressor.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/SwiftCompressor",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/sochalewski/SwiftCompressor.git
[1/257] Fetching swiftcompressor
Fetched https://github.com/sochalewski/SwiftCompressor.git from cache (0.75s)
Creating working copy for https://github.com/sochalewski/SwiftCompressor.git
Working copy of https://github.com/sochalewski/SwiftCompressor.git resolved at master (af8cb04)
warning: '.resolve-product-dependencies': dependency 'swiftcompressor' 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/sochalewski/SwiftCompressor.git
https://github.com/sochalewski/SwiftCompressor.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftCompressor",
  "name" : "SwiftCompressor",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "macos",
      "version" : "10.11"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftCompressor",
      "targets" : [
        "SwiftCompressor"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftCompressorTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftCompressorTests",
      "path" : "Tests/SwiftCompressorTests",
      "sources" : [
        "SwiftCompressorTests.swift"
      ],
      "target_dependencies" : [
        "SwiftCompressor"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftCompressor",
      "module_type" : "SwiftTarget",
      "name" : "SwiftCompressor",
      "path" : "Sources/SwiftCompressor",
      "product_memberships" : [
        "SwiftCompressor"
      ],
      "sources" : [
        "Data+Compressor.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
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
[3/4] Emitting module SwiftCompressor
[4/4] Compiling SwiftCompressor Data+Compressor.swift
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCompressor/Data+Compressor.swift:115:32: warning: sending 'algorithm' risks causing data races; this is an error in the Swift 6 language mode
113 |             do {
114 |                 let data = try compress(
115 |                     algorithm: algorithm,
    |                                |- warning: sending 'algorithm' risks causing data races; this is an error in the Swift 6 language mode
    |                                `- note: task-isolated 'algorithm' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
116 |                     operation: .compression,
117 |                     bufferSize: bufferSize
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCompressor/Data+Compressor.swift:119:17: warning: sending 'completion' risks causing data races; this is an error in the Swift 6 language mode
117 |                     bufferSize: bufferSize
118 |                 )
119 |                 completion(.success(data))
    |                 |- warning: sending 'completion' risks causing data races; this is an error in the Swift 6 language mode
    |                 `- note: task-isolated 'completion' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
120 |             } catch let error {
121 |                 guard let error = error as? CompressionError else { return }
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCompressor/Data+Compressor.swift:159:32: warning: sending 'algorithm' risks causing data races; this is an error in the Swift 6 language mode
157 |             do {
158 |                 let data = try compress(
159 |                     algorithm: algorithm,
    |                                |- warning: sending 'algorithm' risks causing data races; this is an error in the Swift 6 language mode
    |                                `- note: task-isolated 'algorithm' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
160 |                     operation: .decompression,
161 |                     bufferSize: bufferSize
/Users/admin/builder/spi-builder-workspace/Sources/SwiftCompressor/Data+Compressor.swift:163:17: warning: sending 'completion' risks causing data races; this is an error in the Swift 6 language mode
161 |                     bufferSize: bufferSize
162 |                 )
163 |                 completion(.success(data))
    |                 |- warning: sending 'completion' risks causing data races; this is an error in the Swift 6 language mode
    |                 `- note: task-isolated 'completion' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
164 |             } catch let error {
165 |                 guard let error = error as? CompressionError else { return }
Build complete! (4.32s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SwiftCompressor",
  "name" : "SwiftCompressor",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "9.0"
    },
    {
      "name" : "macos",
      "version" : "10.11"
    },
    {
      "name" : "watchos",
      "version" : "2.0"
    },
    {
      "name" : "tvos",
      "version" : "9.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftCompressor",
      "targets" : [
        "SwiftCompressor"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftCompressorTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftCompressorTests",
      "path" : "Tests/SwiftCompressorTests",
      "sources" : [
        "SwiftCompressorTests.swift"
      ],
      "target_dependencies" : [
        "SwiftCompressor"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftCompressor",
      "module_type" : "SwiftTarget",
      "name" : "SwiftCompressor",
      "path" : "Sources/SwiftCompressor",
      "product_memberships" : [
        "SwiftCompressor"
      ],
      "sources" : [
        "Data+Compressor.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
Done.