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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 Cheetah, reference 2.0.3-swift5 (50f960), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 22:58:38 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/OpenKitten/Cheetah.git
Reference: 2.0.3-swift5
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/OpenKitten/Cheetah
 * tag               2.0.3-swift5 -> FETCH_HEAD
HEAD is now at 50f9605 Swift 5 support
Cloned https://github.com/OpenKitten/Cheetah.git
Revision (git rev-parse @):
50f9605735311aaecba33c7d162f198d45c07e0d
SUCCESS checkout https://github.com/OpenKitten/Cheetah.git at 2.0.3-swift5
========================================
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": "cheetah",
      "name": "Cheetah",
      "url": "https://github.com/OpenKitten/Cheetah.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/Cheetah",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/OpenKitten/Cheetah.git
[1/362] Fetching cheetah
Fetched https://github.com/OpenKitten/Cheetah.git from cache (0.83s)
Creating working copy for https://github.com/OpenKitten/Cheetah.git
Working copy of https://github.com/OpenKitten/Cheetah.git resolved at 2.0.3-swift5 (50f9605)
warning: '.resolve-product-dependencies': dependency 'cheetah' 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/OpenKitten/Cheetah.git
https://github.com/OpenKitten/Cheetah.git
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Cheetah",
  "name" : "Cheetah",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Cheetah",
      "targets" : [
        "Cheetah"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Cheetah",
      "module_type" : "SwiftTarget",
      "name" : "Cheetah",
      "path" : "Sources/Cheetah",
      "product_memberships" : [
        "Cheetah"
      ],
      "sources" : [
        "Array.swift",
        "Codable.swift",
        "Helpers.swift",
        "InternalHelpers.swift",
        "Object.swift",
        "Parser.swift",
        "Value.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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
[3/10] Compiling Cheetah Parser.swift
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Parser.swift:219:47: warning: 'characters' is deprecated: Please use String directly
217 |             var prefix = prefix
218 |
219 |             if negate && autoNegate && prefix.characters.first != "-" {
    |                                               `- warning: 'characters' is deprecated: Please use String directly
220 |                 prefix = "-" + prefix
221 |             }
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Parser.swift:231:26: warning: 'characters' is deprecated: Please use String directly
229 |             }
230 |
231 |             guard number.characters.count > 0 else {
    |                          `- warning: 'characters' is deprecated: Please use String directly
232 |                 return nil
233 |             }
[4/10] Compiling Cheetah Object.swift
[5/10] Compiling Cheetah Value.swift
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Value.swift:103:24: warning: 'characters' is deprecated: Please use String directly
101 |                 buffer.append(contentsOf: "\\u".utf8)
102 |                 let str = String(char, radix: 16, uppercase: true)
103 |                 if str.characters.count == 1 {
    |                        `- warning: 'characters' is deprecated: Please use String directly
104 |                     buffer.append(contentsOf: "000\(str)".utf8)
105 |                 } else {
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Value.swift:170:26: warning: 'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value
168 | extension Array : CheetahValue {
169 |     public func serialize() -> [UInt8] {
170 |         let array = self.flatMap { value -> CheetahValue? in
    |                          |- warning: 'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value
    |                          `- note: use 'compactMap(_:)' instead
171 |             guard let value = value as? CheetahValue else {
172 |                 let error = "Only [Cheetah.Value] arrays are Cheetah.Value. Tried to initialize a JSONArray using [\(Element.self)]. This will crash on debug and print this message on release configurations."
[6/10] Compiling Cheetah Helpers.swift
[7/10] Compiling Cheetah InternalHelpers.swift
[8/10] Emitting module Cheetah
[9/10] Compiling Cheetah Array.swift
[10/10] Compiling Cheetah Codable.swift
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Codable.swift:655:43: warning: 'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value
653 |
654 |     var allKeys: [Key] {
655 |         return decoder.target.object.keys.flatMap { Key(stringValue: $0) }
    |                                           |- warning: 'flatMap' is deprecated: Please use compactMap(_:) for the case where closure returns an optional value
    |                                           `- note: use 'compactMap(_:)' instead
656 |     }
657 |
/Users/admin/builder/spi-builder-workspace/Sources/Cheetah/Codable.swift:624:20: warning: function call causes an infinite recursion
622 |
623 |     func unwrap(_ value: Value?) throws -> UInt64 {
624 |         return try unwrap(value)
    |                    `- warning: function call causes an infinite recursion
625 |     }
626 |
Build complete! (4.46s)
Build complete.
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Cheetah",
  "name" : "Cheetah",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Cheetah",
      "targets" : [
        "Cheetah"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Cheetah",
      "module_type" : "SwiftTarget",
      "name" : "Cheetah",
      "path" : "Sources/Cheetah",
      "product_memberships" : [
        "Cheetah"
      ],
      "sources" : [
        "Array.swift",
        "Codable.swift",
        "Helpers.swift",
        "InternalHelpers.swift",
        "Object.swift",
        "Parser.swift",
        "Value.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
Done.