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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 Promis, reference master (cbc7ac), with Swift 6.1 for Linux on 27 Apr 2025 06:23:34 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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/albertodebortoli/Promis.git
Reference: master
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/albertodebortoli/Promis
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at cbc7acc Merge pull request #18 from albertodebortoli/fix-whenAll-leak
Cloned https://github.com/albertodebortoli/Promis.git
Revision (git rev-parse @):
cbc7accb649990c1248cf1de7159cf427a932550
SUCCESS checkout https://github.com/albertodebortoli/Promis.git at master
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/albertodebortoli/Promis.git
https://github.com/albertodebortoli/Promis.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "Promis",
  "name" : "Promis",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "Promis",
      "targets" : [
        "Promis"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "PromisTests",
      "module_type" : "SwiftTarget",
      "name" : "PromisTests",
      "path" : "Tests/Sources",
      "sources" : [
        "PromisTests.swift"
      ],
      "target_dependencies" : [
        "Promis"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Promis",
      "module_type" : "SwiftTarget",
      "name" : "Promis",
      "path" : "Framework/Sources",
      "product_memberships" : [
        "Promis"
      ],
      "sources" : [
        "Future+Chaining.swift",
        "Future+WhenAll.swift",
        "Future.swift",
        "FutureState.swift",
        "PromisError.swift",
        "Promise.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/host -w "$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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/9] Compiling Promis Future.swift
[4/9] Compiling Promis FutureState.swift
[5/9] Compiling Promis PromisError.swift
[6/9] Compiling Promis Promise.swift
[7/9] Emitting module Promis
[8/9] Compiling Promis Future+Chaining.swift
/host/spi-builder-workspace/Framework/Sources/Future+Chaining.swift:27:21: warning: capture of 'block' with non-sendable type '(Future<ResultType>) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 25 |             if let queue = queue {
 26 |                 queue.async {
 27 |                     block(future)
    |                     |- warning: capture of 'block' with non-sendable type '(Future<ResultType>) -> Void' in a '@Sendable' closure; this is an error in the Swift 6 language mode
    |                     `- note: a function type must be marked '@Sendable' to conform to 'Sendable'
 28 |                 }
 29 |             } else {
/host/spi-builder-workspace/Framework/Sources/Future+Chaining.swift:27:27: warning: capture of 'future' with non-sendable type 'Future<ResultType>' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 25 |             if let queue = queue {
 26 |                 queue.async {
 27 |                     block(future)
    |                           `- warning: capture of 'future' with non-sendable type 'Future<ResultType>' in a '@Sendable' closure; this is an error in the Swift 6 language mode
 28 |                 }
 29 |             } else {
/host/spi-builder-workspace/Framework/Sources/Future.swift:11:14: note: generic class 'Future' does not conform to the 'Sendable' protocol
  9 | import Foundation
 10 |
 11 | public class Future<ResultType> {
    |              `- note: generic class 'Future' does not conform to the 'Sendable' protocol
 12 |
 13 |     let cv: NSCondition
[9/9] Compiling Promis Future+WhenAll.swift
/host/spi-builder-workspace/Framework/Sources/Future+WhenAll.swift:28:21: error: cannot find 'OSAtomicDecrement32' in scope
26 |             element.finally { [unowned future] fut in
27 |                 states[index] = fut.state
28 |                 if (OSAtomicDecrement32(&counter) == 0) {
   |                     `- error: cannot find 'OSAtomicDecrement32' in scope
29 |                     future.setResult(states)
30 |                 }
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-0":/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
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
[2/8] Compiling Promis Promise.swift
[3/8] Compiling Promis FutureState.swift
[4/8] Compiling Promis PromisError.swift
[5/8] Emitting module Promis
[6/8] Compiling Promis Future.swift
[7/8] Compiling Promis Future+Chaining.swift
[8/8] Compiling Promis Future+WhenAll.swift
/host/spi-builder-workspace/Framework/Sources/Future+WhenAll.swift:28:21: error: cannot find 'OSAtomicDecrement32' in scope
26 |             element.finally { [unowned future] fut in
27 |                 states[index] = fut.state
28 |                 if (OSAtomicDecrement32(&counter) == 0) {
   |                     `- error: cannot find 'OSAtomicDecrement32' in scope
29 |                     future.setResult(states)
30 |                 }
BUILD FAILURE 6.1 linux