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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 Lynx, reference master (ebe76d), with Swift 6.1 for macOS (SPM) on 24 Apr 2025 16:56:38 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/openkitten/lynx.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/openkitten/lynx
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at ebe76d0 Fixed specific cookie parsing
Cloned https://github.com/openkitten/lynx.git
Revision (git rev-parse @):
ebe76d0747763ff0ae49d546a0e507d70e3623cf
SUCCESS checkout https://github.com/openkitten/lynx.git at master
Fetching https://github.com/OpenKitten/KittenCTLS.git
Fetching https://github.com/OpenKitten/CryptoKitten.git
[1/627] Fetching cryptokitten
[33/664] Fetching cryptokitten, kittenctls
Fetched https://github.com/OpenKitten/CryptoKitten.git from cache (0.73s)
Fetched https://github.com/OpenKitten/KittenCTLS.git from cache (0.73s)
Computing version for https://github.com/OpenKitten/KittenCTLS.git
error: Dependencies could not be resolved because 'kittenctls' contains incompatible tools version (3.1.0) and root depends on 'kittenctls' 1.0.0..<2.0.0.
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/openkitten/lynx.git
https://github.com/openkitten/lynx.git
{
  "dependencies" : [
    {
      "identity" : "cryptokitten",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.2.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/OpenKitten/CryptoKitten.git"
    },
    {
      "identity" : "kittenctls",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/OpenKitten/KittenCTLS.git"
    }
  ],
  "manifest_display_name" : "Lynx",
  "name" : "Lynx",
  "path" : "/Users/admin/builder/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Lynx",
      "targets" : [
        "Lynx"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "LynxTests",
      "module_type" : "SwiftTarget",
      "name" : "LynxTests",
      "path" : "Tests/LynxTests",
      "sources" : [
        "PathTests.swift"
      ],
      "target_dependencies" : [
        "Lynx"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Lynx",
      "module_type" : "SwiftTarget",
      "name" : "Lynx",
      "path" : "Sources/Lynx",
      "product_dependencies" : [
        "CryptoKitten"
      ],
      "product_memberships" : [
        "Lynx"
      ],
      "sources" : [
        "HTTP/HTTPParser.swift",
        "HTTP/HTTPServer.swift",
        "Helpers/Base64.swift",
        "Helpers/Error.swift",
        "Helpers/UTF8String.swift",
        "Message/Cookie.swift",
        "Message/Headers.swift",
        "Request/Multipart.swift",
        "Request/Path.swift",
        "Request/Query.swift",
        "Request/Request.swift",
        "Response/Body.swift",
        "Response/NotFound.swift",
        "Response/Response.swift",
        "Response/ResponseRepresentable.swift",
        "Routing/Routing.swift",
        "Sockets/TCPClient.swift",
        "Sockets/TCPSSLClient.swift",
        "Sockets/TCPServer.swift",
        "Sockets/TCPServerClient.swift",
        "Sockets/TCPSocket.swift",
        "WebSocket/Frame.swift",
        "WebSocket/WebSocket.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
Updating https://github.com/OpenKitten/KittenCTLS.git
Updating https://github.com/OpenKitten/CryptoKitten.git
Updated https://github.com/OpenKitten/CryptoKitten.git (0.43s)
Updated https://github.com/OpenKitten/KittenCTLS.git (0.43s)
Computing version for https://github.com/OpenKitten/KittenCTLS.git
error: Dependencies could not be resolved because 'kittenctls' contains incompatible tools version (3.1.0) and root depends on 'kittenctls' 1.0.0..<2.0.0.
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
Updating https://github.com/OpenKitten/CryptoKitten.git
Updating https://github.com/OpenKitten/KittenCTLS.git
Updated https://github.com/OpenKitten/KittenCTLS.git (0.43s)
Updated https://github.com/OpenKitten/CryptoKitten.git (0.43s)
Computing version for https://github.com/OpenKitten/KittenCTLS.git
error: Dependencies could not be resolved because 'kittenctls' contains incompatible tools version (3.1.0) and root depends on 'kittenctls' 1.0.0..<2.0.0.
BUILD FAILURE 6.1 macosSpm