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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

Failed to build EmojiKit, reference 1.2.0 (29f53f), with Swift 6.1 for iOS using Xcode 16.3 on 24 Apr 2025 15:05:21 UTC.

Build Command

No build command. This typically means the build failed at an early stage where we determine the build command.

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/yutomizutani/emojikit.git
Reference: 1.2.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/yutomizutani/emojikit
 * tag               1.2.0      -> FETCH_HEAD
HEAD is now at 29f53f0 Add CLI tool with emojigen command #4
Cloned https://github.com/yutomizutani/emojikit.git
Revision (git rev-parse @):
29f53f08d901297e7a385389acca05643e2b3ee0
SUCCESS checkout https://github.com/yutomizutani/emojikit.git at 1.2.0
========================================
Build
========================================
Selected platform:         iOS
Swift version:             6.1
Building package at path:  $PWD
https://github.com/yutomizutani/emojikit.git
https://github.com/yutomizutani/emojikit.git
{
  "dependencies" : [
    {
      "identity" : "pythonkit",
      "requirement" : {
        "branch" : [
          "swift-5.1"
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/pvieito/PythonKit.git"
    },
    {
      "identity" : "swift-argument-parser",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.0.1",
            "upper_bound" : "0.1.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-argument-parser"
    }
  ],
  "manifest_display_name" : "EmojiKit",
  "name" : "EmojiKit",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "emojigen",
      "targets" : [
        "EmojiGen"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "EmojiKit",
      "targets" : [
        "EmojiKit"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "EmojiKitTests",
      "module_type" : "SwiftTarget",
      "name" : "EmojiKitTests",
      "path" : "Tests/EmojiKitTests",
      "sources" : [
        "EmojiKitTests.swift",
        "XCTestManifests.swift"
      ],
      "target_dependencies" : [
        "EmojiKit"
      ],
      "type" : "test"
    },
    {
      "c99name" : "EmojiKit",
      "module_type" : "SwiftTarget",
      "name" : "EmojiKit",
      "path" : "Sources/EmojiKit",
      "product_dependencies" : [
        "PythonKit"
      ],
      "product_memberships" : [
        "emojigen",
        "EmojiKit"
      ],
      "sources" : [
        "EmojiKit.swift"
      ],
      "type" : "library"
    },
    {
      "c99name" : "EmojiGen",
      "module_type" : "SwiftTarget",
      "name" : "EmojiGen",
      "path" : "Sources/EmojiGen",
      "product_dependencies" : [
        "ArgumentParser"
      ],
      "product_memberships" : [
        "emojigen"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
        "EmojiKit"
      ],
      "type" : "executable"
    }
  ],
  "tools_version" : "5.1"
}
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Fetching from https://github.com/pvieito/PythonKit.git
could not find a branch named ‘swift-5.1’ in https://github.com/pvieito/PythonKit.gitResolve Package Graph
Updating from https://github.com/pvieito/PythonKit.git
could not find a branch named ‘swift-5.1’ in https://github.com/pvieito/PythonKit.git
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 08:05:20.491 xcodebuild[518:2878] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_08-05-0020.xcresult
xcodebuild: error: Could not resolve package dependencies:
  could not find a branch named ‘swift-5.1’ in https://github.com/pvieito/PythonKit.git
Command line invocation:
    /Applications/Xcode-16.3.0.app/Contents/Developer/usr/bin/xcodebuild -IDEClonedSourcePackagesDirPathOverride=/Users/admin/builder/spi-builder-workspace/.dependencies -resolvePackageDependencies
Resolve Package Graph
Updating from https://github.com/pvieito/PythonKit.git
could not find a branch named ‘swift-5.1’ in https://github.com/pvieito/PythonKit.git
Resolved source packages:
  spi-builder-workspace: (null)
2025-04-24 08:05:21.642 xcodebuild[630:3445] Writing error result bundle to /var/folders/5k/5yc19ymj0jqd5v0zvgfqz0xw0000gn/T/ResultBundle_2025-24-04_08-05-0021.xcresult
xcodebuild: error: Could not resolve package dependencies:
  could not find a branch named ‘swift-5.1’ in https://github.com/pvieito/PythonKit.git
BUILD FAILURE 6.1 iOS