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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 swift-signal, reference main (39127f), with Swift 6.1 for Linux on 28 Apr 2025 11:29:57 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/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/unixzii/swift-signal.git
Reference: main
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/unixzii/swift-signal
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 39127fa Change the  property wrapper constructor to convenience init
Cloned https://github.com/unixzii/swift-signal.git
Revision (git rev-parse @):
39127faee5c1f1c57effb81b172ef989089e8bd7
SUCCESS checkout https://github.com/unixzii/swift-signal.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/unixzii/swift-signal.git
https://github.com/unixzii/swift-signal.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "swift-signal",
  "name" : "swift-signal",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    },
    {
      "name" : "macos",
      "version" : "10.15"
    },
    {
      "name" : "maccatalyst",
      "version" : "13.0"
    },
    {
      "name" : "tvos",
      "version" : "13.0"
    },
    {
      "name" : "watchos",
      "version" : "6.0"
    },
    {
      "name" : "visionos",
      "version" : "1.0"
    }
  ],
  "products" : [
    {
      "name" : "SwiftSignal",
      "targets" : [
        "SwiftSignal"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    },
    {
      "name" : "SwiftUISignal",
      "targets" : [
        "SwiftUISignal"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SwiftUISignal",
      "module_type" : "SwiftTarget",
      "name" : "SwiftUISignal",
      "path" : "Sources/SwiftUISignal",
      "product_memberships" : [
        "SwiftUISignal"
      ],
      "sources" : [
        "ObservedTypes.swift"
      ],
      "target_dependencies" : [
        "SwiftSignal"
      ],
      "type" : "library"
    },
    {
      "c99name" : "SwiftSignalTests",
      "module_type" : "SwiftTarget",
      "name" : "SwiftSignalTests",
      "path" : "Tests/SwiftSignalTests",
      "sources" : [
        "SwiftSignalTests.swift"
      ],
      "target_dependencies" : [
        "SwiftSignal"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SwiftSignal",
      "module_type" : "SwiftTarget",
      "name" : "SwiftSignal",
      "path" : "Sources/SwiftSignal",
      "product_memberships" : [
        "SwiftSignal",
        "SwiftUISignal"
      ],
      "sources" : [
        "Computation.swift",
        "Observer.swift",
        "Scope.swift",
        "Signal.swift",
        "Source.swift",
        "ThreadLocal.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.9"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/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
Building for debugging...
[0/3] Write sources
[2/3] Write swift-version-24593BA9C3E375BF.txt
[4/10] Emitting module SwiftSignal
[5/10] Compiling SwiftSignal Observer.swift
[6/10] Compiling SwiftSignal Computation.swift
[7/10] Compiling SwiftSignal Scope.swift
[8/10] Compiling SwiftSignal Signal.swift
[9/10] Compiling SwiftSignal Source.swift
[10/10] Compiling SwiftSignal ThreadLocal.swift
[12/13] Compiling SwiftUISignal ObservedTypes.swift
/host/spi-builder-workspace/Sources/SwiftUISignal/ObservedTypes.swift:8:8: error: no such module 'SwiftUI'
 6 | */
 7 |
 8 | import SwiftUI
   |        `- error: no such module 'SwiftUI'
 9 | import Combine
10 | import SwiftSignal
error: emit-module command failed with exit code 1 (use -v to see invocation)
[13/13] Emitting module SwiftUISignal
/host/spi-builder-workspace/Sources/SwiftUISignal/ObservedTypes.swift:8:8: error: no such module 'SwiftUI'
 6 | */
 7 |
 8 | import SwiftUI
   |        `- error: no such module 'SwiftUI'
 9 | import Combine
10 | import SwiftSignal
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-3":/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
[0/1] Planning build
Building for debugging...
[0/1] Write swift-version-24593BA9C3E375BF.txt
[2/8] Compiling SwiftSignal Source.swift
[3/8] Compiling SwiftSignal ThreadLocal.swift
[4/8] Compiling SwiftSignal Scope.swift
[5/8] Compiling SwiftSignal Observer.swift
[6/8] Compiling SwiftSignal Signal.swift
[7/8] Compiling SwiftSignal Computation.swift
[8/8] Emitting module SwiftSignal
error: emit-module command failed with exit code 1 (use -v to see invocation)
[10/11] Emitting module SwiftUISignal
/host/spi-builder-workspace/Sources/SwiftUISignal/ObservedTypes.swift:8:8: error: no such module 'SwiftUI'
 6 | */
 7 |
 8 | import SwiftUI
   |        `- error: no such module 'SwiftUI'
 9 | import Combine
10 | import SwiftSignal
[11/11] Compiling SwiftUISignal ObservedTypes.swift
/host/spi-builder-workspace/Sources/SwiftUISignal/ObservedTypes.swift:8:8: error: no such module 'SwiftUI'
 6 | */
 7 |
 8 | import SwiftUI
   |        `- error: no such module 'SwiftUI'
 9 | import Combine
10 | import SwiftSignal
BUILD FAILURE 6.1 linux