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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 SplitView, reference 3.5.3 (7737a8), with Swift 6.1 for Linux on 29 Apr 2025 00:11:20 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/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/stevengharris/SplitView.git
Reference: 3.5.3
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/stevengharris/SplitView
 * tag               3.5.3      -> FETCH_HEAD
HEAD is now at 7737a80 Merge pull request #37 from bastiaanterhorst/main
Cloned https://github.com/stevengharris/SplitView.git
Revision (git rev-parse @):
7737a80740919c2fa94a6e64f870d37ef77b9b5f
SUCCESS checkout https://github.com/stevengharris/SplitView.git at 3.5.3
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/stevengharris/SplitView.git
https://github.com/stevengharris/SplitView.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "SplitView",
  "name" : "SplitView",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "macos",
      "version" : "12.0"
    },
    {
      "name" : "ios",
      "version" : "15.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "15.0"
    }
  ],
  "products" : [
    {
      "name" : "SplitView",
      "targets" : [
        "SplitView"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "SplitViewTests",
      "module_type" : "SwiftTarget",
      "name" : "SplitViewTests",
      "path" : "Tests/SplitViewTests",
      "sources" : [
        "SplitViewTests.swift"
      ],
      "target_dependencies" : [
        "SplitView"
      ],
      "type" : "test"
    },
    {
      "c99name" : "SplitView",
      "module_type" : "SwiftTarget",
      "name" : "SplitView",
      "path" : "Sources/SplitView",
      "product_memberships" : [
        "SplitView"
      ],
      "sources" : [
        "HSplit.swift",
        "Split.swift",
        "SplitConstraints.swift",
        "SplitEnums.swift",
        "SplitHolders.swift",
        "SplitModifiers.swift",
        "SplitStyling.swift",
        "Splitter+Extensions.swift",
        "Splitter.swift",
        "VSplit.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$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
[3/12] Compiling SplitView Splitter.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[4/13] Compiling SplitView VSplit.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[5/13] Compiling SplitView SplitModifiers.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[6/13] Compiling SplitView SplitStyling.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[7/13] Compiling SplitView Splitter+Extensions.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[8/13] Compiling SplitView SplitHolders.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[9/13] Compiling SplitView SplitConstraints.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[10/13] Compiling SplitView SplitEnums.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
error: emit-module command failed with exit code 1 (use -v to see invocation)
[11/13] Emitting module SplitView
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[12/13] Compiling SplitView HSplit.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[13/13] Compiling SplitView Split.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/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
[2/11] Compiling SplitView SplitStyling.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[3/11] Compiling SplitView Splitter+Extensions.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[4/11] Compiling SplitView Splitter.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[5/11] Compiling SplitView SplitModifiers.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[6/12] Compiling SplitView SplitHolders.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[7/12] Compiling SplitView SplitConstraints.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[8/12] Compiling SplitView SplitEnums.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[9/12] Compiling SplitView VSplit.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
error: emit-module command failed with exit code 1 (use -v to see invocation)
[10/12] Emitting module SplitView
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[11/12] Compiling SplitView HSplit.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
[12/12] Compiling SplitView Split.swift
/host/spi-builder-workspace/Sources/SplitView/HSplit.swift:8:8: error: no such module 'SwiftUI'
  6 | //
  7 |
  8 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  9 |
 10 | @MainActor
BUILD FAILURE 6.1 linux