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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-play-experimental, reference main (b81a94), with Swift 6.0 for Linux on 26 Apr 2025 08:25:36 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-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/apple/swift-play-experimental.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/apple/swift-play-experimental
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at b81a94a Merge pull request #1 from apple/chrismiles/fix_linux_build
Cloned https://github.com/apple/swift-play-experimental.git
Revision (git rev-parse @):
b81a94ab0f05fc565839384c7fce368b67737d4c
SUCCESS checkout https://github.com/apple/swift-play-experimental.git at main
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.0
Building package at path:  $PWD
https://github.com/apple/swift-play-experimental.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-0":/host -w "$PWD" registry.gitlab.com/finestructure/spi-images:basic-6.0-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.0-latest: Pulling from finestructure/spi-images
Digest: sha256:9029076bb687edc160a3d5201c89e92dd9fa7309f33f090c4234365c83366c31
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.0-latest
Fetching https://github.com/swiftlang/swift-testing.git
[1/22188] Fetching swift-testing
Fetched https://github.com/swiftlang/swift-testing.git from cache (0.85s)
error: package 'swift-testing' @ 6023a5fb9a6ff4f67790b7a9065ddf449ffd7f54 is using Swift tools version 6.1.0 but the installed version is 6.0.3 in https://github.com/swiftlang/swift-testing.git
BUILD FAILURE 6.0 linux