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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 Flow, reference v1.2.3 (5c1b99), with Swift 6.1 for Linux on 28 Apr 2025 10:37:19 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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/toastersocks/Flow.git
Reference: v1.2.3
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/toastersocks/Flow
 * tag               v1.2.3     -> FETCH_HEAD
HEAD is now at 5c1b99a Fix a bug that caused views to be misplaced in non-leading alignments when the proposed bounds rect had a non-zero value
Cloned https://github.com/toastersocks/Flow.git
Revision (git rev-parse @):
5c1b99acf390ace87006e065b14f9bdcdd27fdbb
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/toastersocks/Flow.git at v1.2.3
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/toastersocks/Flow.git
https://github.com/toastersocks/Flow.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
  "dependencies" : [
    {
      "identity" : "swiftcheck",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "0.12.0",
            "upper_bound" : "1.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/typelift/SwiftCheck"
    }
  ],
  "manifest_display_name" : "Flow",
  "name" : "Flow",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
    {
      "name" : "ios",
      "version" : "16.0"
    },
    {
      "name" : "macos",
      "version" : "13.0"
    },
    {
      "name" : "maccatalyst",
      "version" : "16.0"
    },
    {
      "name" : "tvos",
      "version" : "16.0"
    },
    {
      "name" : "watchos",
      "version" : "9.0"
    }
  ],
  "products" : [
    {
      "name" : "Flow",
      "targets" : [
        "Flow"
      ],
      "type" : {
        "library" : [
          "automatic"
        ]
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "FlowTests",
      "module_type" : "SwiftTarget",
      "name" : "FlowTests",
      "path" : "Tests/FlowTests",
      "product_dependencies" : [
        "SwiftCheck"
      ],
      "sources" : [
        "+Arbitrary.swift",
        "FloatingPointCompare.swift",
        "FlowTests.swift",
        "Mocks.swift"
      ],
      "target_dependencies" : [
        "Flow"
      ],
      "type" : "test"
    },
    {
      "c99name" : "Flow",
      "module_type" : "SwiftTarget",
      "name" : "Flow",
      "path" : "Sources/Flow",
      "product_memberships" : [
        "Flow"
      ],
      "sources" : [
        "Flow.swift",
        "PreviewCode.swift",
        "SupportingTypes.swift"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.8"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$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
Fetching https://github.com/typelift/SwiftCheck
[1/4870] Fetching swiftcheck
Fetched https://github.com/typelift/SwiftCheck from cache (0.38s)
Computing version for https://github.com/typelift/SwiftCheck
Computed https://github.com/typelift/SwiftCheck at 0.12.0 (2.77s)
Fetching https://github.com/llvm-swift/FileCheck.git
[1/479] Fetching filecheck
Fetched https://github.com/llvm-swift/FileCheck.git from cache (0.23s)
Computing version for https://github.com/llvm-swift/FileCheck.git
Computed https://github.com/llvm-swift/FileCheck.git at 0.2.6 (1.16s)
Fetching https://github.com/mxcl/Chalk.git
Fetching https://github.com/apple/swift-argument-parser
[1/81] Fetching chalk
Fetched https://github.com/mxcl/Chalk.git from cache (0.30s)
[1/14950] Fetching swift-argument-parser
Fetched https://github.com/apple/swift-argument-parser from cache (0.90s)
Computing version for https://github.com/mxcl/Chalk.git
Computed https://github.com/mxcl/Chalk.git at 0.5.0 (2.43s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.5.0 (1.35s)
Creating working copy for https://github.com/mxcl/Chalk.git
Working copy of https://github.com/mxcl/Chalk.git resolved at 0.5.0
Creating working copy for https://github.com/typelift/SwiftCheck
Working copy of https://github.com/typelift/SwiftCheck resolved at 0.12.0
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.5.0
Creating working copy for https://github.com/llvm-swift/FileCheck.git
Working copy of https://github.com/llvm-swift/FileCheck.git resolved at 0.2.6
[1/1] Compiling plugin GenerateManual
Building for debugging...
[1/3] Write sources
[2/3] Write swift-version-24593BA9C3E375BF.txt
[4/7] Compiling Flow PreviewCode.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
[5/7] Compiling Flow SupportingTypes.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
error: emit-module command failed with exit code 1 (use -v to see invocation)
[6/7] Emitting module Flow
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
[7/7] Compiling Flow Flow.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/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
[1/1] Compiling plugin GenerateManual
Building for debugging...
[1/2] Write swift-version-24593BA9C3E375BF.txt
[3/6] Compiling Flow SupportingTypes.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
error: emit-module command failed with exit code 1 (use -v to see invocation)
[4/6] Emitting module Flow
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
[5/6] Compiling Flow PreviewCode.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
[6/6] Compiling Flow Flow.swift
/host/spi-builder-workspace/Sources/Flow/Flow.swift:1:8: error: no such module 'SwiftUI'
  1 | import SwiftUI
    |        `- error: no such module 'SwiftUI'
  2 |
  3 |
BUILD FAILURE 6.1 linux