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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 FlowingMenu, reference 3.1.0 (51a155), with Swift 6.1 for Linux on 25 Apr 2025 20:16:41 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/yannickl/FlowingMenu.git
Reference: 3.1.0
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/yannickl/FlowingMenu
 * tag               3.1.0      -> FETCH_HEAD
HEAD is now at 51a1557 Bump to v3.1.0
Cloned https://github.com/yannickl/FlowingMenu.git
Revision (git rev-parse @):
51a15579107e85680277148d548840ef23fc40e0
SUCCESS checkout https://github.com/yannickl/FlowingMenu.git at 3.1.0
========================================
Build
========================================
Selected platform:         linux
Swift version:             6.1
Building package at path:  $PWD
https://github.com/yannickl/FlowingMenu.git
https://github.com/yannickl/FlowingMenu.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: fatalError
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4609320-1":/host -w "$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
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
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
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: 'spi-builder-workspace': the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
error: the Swift tools version specification is missing a label; consider inserting 'swift-tools-version:' between the comment marker and the version specifier
BUILD FAILURE 6.1 linux