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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

Successful build of swift-backtrace, reference main (f01e34), with Swift 6.1 for Linux on 28 Apr 2025 23:04:17 UTC.

Swift 6 data race errors: 0

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 -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

Build Log

========================================
RunAll
========================================
Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/swift-server/swift-backtrace.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/swift-server/swift-backtrace
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at f01e340 Update README.md for archiving
Cloned https://github.com/swift-server/swift-backtrace.git
Revision (git rev-parse @):
f01e3400ae083e9c28be5c86f53d7b7b0b0478da
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/swift-server/swift-backtrace.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/swift-server/swift-backtrace.git
https://github.com/swift-server/swift-backtrace.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
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      "identity" : "swift-docc-plugin",
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      "type" : "sourceControl",
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  "name" : "swift-backtrace",
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        "Backtrace"
      ],
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      "name" : "Sample",
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      }
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  ],
  "targets" : [
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      "c99name" : "Sample",
      "module_type" : "SwiftTarget",
      "name" : "Sample",
      "path" : "Sources/Sample",
      "product_memberships" : [
        "Sample"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
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      ],
      "type" : "executable"
    },
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      "c99name" : "CBacktrace",
      "module_type" : "ClangTarget",
      "name" : "CBacktrace",
      "path" : "Sources/CBacktrace",
      "product_memberships" : [
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      "sources" : [
        "atomic.c",
        "backtrace.c",
        "dwarf.c",
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        "fileline.c",
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        "posix.c",
        "print.c",
        "simple.c",
        "sort.c",
        "state.c"
      ],
      "type" : "library"
    },
    {
      "c99name" : "BacktraceTests",
      "module_type" : "SwiftTarget",
      "name" : "BacktraceTests",
      "path" : "Tests/BacktraceTests",
      "sources" : [
        "BacktraceTests+XCTest.swift",
        "BacktraceTests.swift"
      ],
      "target_dependencies" : [
        "Backtrace"
      ],
      "type" : "test"
    },
    {
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        "CBacktrace"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
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
Fetching https://github.com/apple/swift-docc-plugin
[1/2049] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (0.97s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.3 (1.76s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3377] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (1.06s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (2.07s)
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.4.3
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/21] Write sources
[3/21] Compiling CBacktrace simple.c
[4/21] Compiling CBacktrace state.c
[5/21] Compiling CBacktrace print.c
[6/21] Compiling CBacktrace sort.c
[7/21] Compiling CBacktrace dwarf.c
[8/21] Compiling CBacktrace posix.c
[8/21] Write sources
[10/21] Compiling CBacktrace mmapio.c
[10/21] Compiling CBacktrace fileline.c
[12/21] Compiling CBacktrace atomic.c
[13/21] Compiling CBacktrace mmap.c
[14/21] Compiling CBacktrace elf.c
[15/21] Compiling CBacktrace backtrace.c
[16/21] Write swift-version-24593BA9C3E375BF.txt
[18/24] Emitting module Backtrace
[19/24] Compiling Backtrace Backtrace.swift
[20/24] Compiling Backtrace Demangle.swift
[21/25] Wrapping AST for Backtrace for debugging
[23/27] Emitting module Sample
[24/27] Compiling Sample main.swift
[25/28] Wrapping AST for Sample for debugging
[26/28] Write Objects.LinkFileList
[27/28] Linking Sample
Build complete! (29.08s)
Build complete.
{
  "dependencies" : [
    {
      "identity" : "swift-docc-plugin",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
        ]
      },
      "type" : "sourceControl",
      "url" : "https://github.com/apple/swift-docc-plugin"
    }
  ],
  "manifest_display_name" : "swift-backtrace",
  "name" : "swift-backtrace",
  "path" : "/host/spi-builder-workspace",
  "platforms" : [
  ],
  "products" : [
    {
      "name" : "Backtrace",
      "targets" : [
        "Backtrace"
      ],
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    {
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        "Sample"
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        "executable" : null
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  ],
  "targets" : [
    {
      "c99name" : "Sample",
      "module_type" : "SwiftTarget",
      "name" : "Sample",
      "path" : "Sources/Sample",
      "product_memberships" : [
        "Sample"
      ],
      "sources" : [
        "main.swift"
      ],
      "target_dependencies" : [
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      "sources" : [
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        "state.c"
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        "Sample"
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      "sources" : [
        "Backtrace.swift",
        "Demangle.swift"
      ],
      "target_dependencies" : [
        "CBacktrace"
      ],
      "type" : "library"
    }
  ],
  "tools_version" : "5.6"
}
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
Done.