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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 Async, reference 1.0.0-rc.1.1 (76ed78), with Swift 6.1 for Linux on 26 Apr 2025 00:06:08 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/vapor-community/async.git
Reference: 1.0.0-rc.1.1
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/vapor-community/async
 * tag               1.0.0-rc.1.1 -> FETCH_HEAD
HEAD is now at 76ed784 Merge pull request #76 from vapor/stream-error-cleanup
Cloned https://github.com/vapor-community/async.git
Revision (git rev-parse @):
76ed7841b32dcc47168e8d9040ba03c024224d0c
SUCCESS checkout https://github.com/vapor-community/async.git at 1.0.0-rc.1.1
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/vapor-community/async.git
https://github.com/vapor-community/async.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "cepoll",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.2.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/vapor/cepoll.git"
    }
  ],
  "manifest_display_name" : "Async",
  "name" : "Async",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Async",
      "targets" : [
        "Async"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "AsyncTests",
      "module_type" : "SwiftTarget",
      "name" : "AsyncTests",
      "path" : "Tests/AsyncTests",
      "sources" : [
        "EventLoopTests.swift",
        "FileTests.swift",
        "FutureTests.swift",
        "StreamTests.swift"
      ],
      "target_dependencies" : [
        "Async"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Async",
      "module_type" : "SwiftTarget",
      "name" : "Async",
      "path" : "Sources/Async",
      "product_dependencies" : [
        "CEpoll"
      ],
      "product_memberships" : [
        "Async"
      ],
      "sources" : [
        "Deprecated.swift",
        "EventLoop/Epoll/EpollEventLoop.swift",
        "EventLoop/Epoll/EpollEventSource.swift",
        "EventLoop/EventLoop.swift",
        "EventLoop/EventLoopTimeout.swift",
        "EventLoop/EventSource.swift",
        "EventLoop/Future+EventLoop.swift",
        "EventLoop/Kqueue/KqueueEventLoop.swift",
        "EventLoop/Kqueue/KqueueEventSource.swift",
        "EventLoop/Worker.swift",
        "File/DirectoryConfig.swift",
        "File/File.swift",
        "File/FileCache.swift",
        "File/FileReader.swift",
        "Futures/Future+BlockingAwait.swift",
        "Futures/Future+DoCatch.swift",
        "Futures/Future+Flatten.swift",
        "Futures/Future+Global.swift",
        "Futures/Future+Map.swift",
        "Futures/Future+Stream.swift",
        "Futures/Future+Transform.swift",
        "Futures/Future+Unwrap.swift",
        "Futures/Future.swift",
        "Futures/FutureResult.swift",
        "Futures/FutureType.swift",
        "Futures/Promise.swift",
        "Futures/PromiseError.swift",
        "Futures/Signal.swift",
        "Socket/Socket.swift",
        "Socket/SocketSink.swift",
        "Socket/SocketSource.swift",
        "Socket/SocketStream.swift",
        "Streams/ByteParserStream.swift",
        "Streams/ByteSerializerStream.swift",
        "Streams/ConnectingStream.swift",
        "Streams/DeltaStream.swift",
        "Streams/DrainStream.swift",
        "Streams/InputStream.swift",
        "Streams/MapStream.swift",
        "Streams/OutputStream.swift",
        "Streams/PushStream.swift",
        "Streams/QueueStream.swift",
        "Streams/Stream.swift",
        "Streams/TranscribingStream.swift",
        "Streams/TranslatingStream.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "4.0"
}
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/vapor/cepoll.git
[1/33] Fetching cepoll
Fetched https://github.com/vapor/cepoll.git from cache (0.35s)
Computing version for https://github.com/vapor/cepoll.git
error: the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
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/vapor/cepoll.git
Updated https://github.com/vapor/cepoll.git (0.24s)
Computing version for https://github.com/vapor/cepoll.git
error: the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
BUILD FAILURE 6.1 linux