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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 RVS_Checkbox, reference 2.0.1 (539526), with Swift 6.1 for Linux on 28 Apr 2025 04:38:56 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/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/RiftValleySoftware/RVS_Checkbox.git
Reference: 2.0.1
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/RiftValleySoftware/RVS_Checkbox
 * tag               2.0.1      -> FETCH_HEAD
HEAD is now at 539526d - Updated the dependencies. - Added privacy statements. - I had to remove SwiftLint, as it no longer works in the latest Xcode.
Cloned https://github.com/RiftValleySoftware/RVS_Checkbox.git
Revision (git rev-parse @):
539526de1a54ca5c0a923dfc3d70891ca9c5ad69
SUCCESS checkout https://github.com/RiftValleySoftware/RVS_Checkbox.git at 2.0.1
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/RiftValleySoftware/RVS_Checkbox.git
https://github.com/RiftValleySoftware/RVS_Checkbox.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
  ],
  "manifest_display_name" : "RVS_Checkbox",
  "name" : "RVS_Checkbox",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "13.0"
    }
  ],
  "products" : [
    {
      "name" : "RVS_Checkbox",
      "targets" : [
        "RVS_Checkbox"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "RVS_Checkbox",
      "module_type" : "SwiftTarget",
      "name" : "RVS_Checkbox",
      "path" : "Sources/RVS_Checkbox",
      "product_memberships" : [
        "RVS_Checkbox"
      ],
      "sources" : [
        "RVS_Checkbox.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.5"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$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
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/4] Emitting module RVS_Checkbox
/host/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
 23 | */
 24 |
 25 | import UIKit
    |        `- error: no such module 'UIKit'
 26 |
 27 | #if os(iOS) // This prevents the IB errors from showing up, under SPM (From SO Answer: https://stackoverflow.com/a/66334661/879365).
[4/4] Compiling RVS_Checkbox RVS_Checkbox.swift
/host/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
 23 | */
 24 |
 25 | import UIKit
    |        `- error: no such module 'UIKit'
 26 |
 27 | #if os(iOS) // This prevents the IB errors from showing up, under SPM (From SO Answer: https://stackoverflow.com/a/66334661/879365).
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/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
error: emit-module command failed with exit code 1 (use -v to see invocation)
[2/3] Emitting module RVS_Checkbox
/host/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
 23 | */
 24 |
 25 | import UIKit
    |        `- error: no such module 'UIKit'
 26 |
 27 | #if os(iOS) // This prevents the IB errors from showing up, under SPM (From SO Answer: https://stackoverflow.com/a/66334661/879365).
[3/3] Compiling RVS_Checkbox RVS_Checkbox.swift
/host/spi-builder-workspace/Sources/RVS_Checkbox/RVS_Checkbox.swift:25:8: error: no such module 'UIKit'
 23 | */
 24 |
 25 | import UIKit
    |        `- error: no such module 'UIKit'
 26 |
 27 | #if os(iOS) // This prevents the IB errors from showing up, under SPM (From SO Answer: https://stackoverflow.com/a/66334661/879365).
BUILD FAILURE 6.1 linux