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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 RxGtk, reference 3.24.0 (aeb4f7), with Swift 6.1 for Linux on 25 Apr 2025 12:26:38 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-3":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/rhx/swiftrxgtk.git
Reference: 3.24.0
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: 	git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: 	git branch -m <name>
From https://github.com/rhx/swiftrxgtk
 * tag               3.24.0     -> FETCH_HEAD
HEAD is now at aeb4f78 Squelch warnings
Cloned https://github.com/rhx/swiftrxgtk.git
Revision (git rev-parse @):
aeb4f7850de6deb3d5f87c957e870321ffae77b9
SUCCESS checkout https://github.com/rhx/swiftrxgtk.git at 3.24.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/rhx/swiftrxgtk.git
https://github.com/rhx/swiftrxgtk.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "rxswift",
      "requirement" : {
        "branch" : [
          "master"
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/ReactiveX/RxSwift.git"
    },
    {
      "identity" : "swiftgtk",
      "requirement" : {
        "branch" : [
          "master"
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/rhx/SwiftGtk.git"
    }
  ],
  "manifest_display_name" : "RxGtk",
  "name" : "RxGtk",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "RxGtk",
      "targets" : [
        "RxGtk"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RxGtkTests",
      "module_type" : "SwiftTarget",
      "name" : "RxGtkTests",
      "path" : "Tests/RxGtkTests",
      "sources" : [
        "RxGtkTests.swift"
      ],
      "target_dependencies" : [
        "RxGtk"
      ],
      "type" : "test"
    },
    {
      "c99name" : "RxGtk",
      "module_type" : "SwiftTarget",
      "name" : "RxGtk",
      "path" : "Sources/RxGtk",
      "product_dependencies" : [
        "Gtk",
        "RxCocoa",
        "RxSwift"
      ],
      "product_memberships" : [
        "RxGtk"
      ],
      "sources" : [
        "Entry+Rx.swift",
        "GObject+Rx.swift",
        "Label+Rx.swift",
        "ListBox+Rx.swift",
        "RxGtk.swift",
        "TextView+Rx.swift",
        "Widget+Rx.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.2"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-3":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -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 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://github.com/ReactiveX/RxSwift.git
[1/52676] Fetching rxswift
Fetched https://github.com/ReactiveX/RxSwift.git from cache (4.10s)
error: could not find a branch named ‘master’ in https://github.com/ReactiveX/RxSwift.git (did you mean ‘main’?)
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-3":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:3bdcac04179f4ed3e5b8e9dbd6e74bbf5ebc0f4fde48bbaad7d1e5c757e65bcb
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Updating https://github.com/ReactiveX/RxSwift.git
Updated https://github.com/ReactiveX/RxSwift.git (0.23s)
error: could not find a branch named ‘master’ in https://github.com/ReactiveX/RxSwift.git (did you mean ‘main’?)
BUILD FAILURE 6.1 linux