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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 BuildEnvironment, reference master (be3551), with Swift 5.10 for macOS (SPM) on 10 Oct 2024 22:54:17 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.55.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/DimaRU/BuildEnvironment.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/DimaRU/BuildEnvironment
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at be3551b Fix README issues
Cloned https://github.com/DimaRU/BuildEnvironment.git
Revision (git rev-parse @):
be3551bd2b2d63e72426c4693c25f6f36108da63
SUCCESS checkout https://github.com/DimaRU/BuildEnvironment.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $PWD
https://github.com/DimaRU/BuildEnvironment.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64
Building for debugging...
[0/6] Write sources
[1/6] Write BuildEnvGenerator-entitlement.plist
[2/6] Write swift-version-33747A42983211AE.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[4/11] Compiling BuildEnvGenerator DictionaryExtensions.swift
[5/11] Compiling BuildEnvGenerator BuildEnvGenerator.swift
[6/11] Compiling BuildEnvGenerator GetArgument.swift
[7/11] Emitting module BuildEnvGenerator
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:23: error: unknown attribute 'retroactive'
extension FileHandle: @retroactive TextOutputStream {
                      ^
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:1: error: inheritance from non-protocol type 'any TextOutputStream'
extension FileHandle: @retroactive TextOutputStream {
^
[8/11] Compiling BuildEnvGenerator stderror.swift
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:23: error: unknown attribute 'retroactive'
extension FileHandle: @retroactive TextOutputStream {
                      ^
/Users/admin/builder/spi-builder-workspace/Sources/BuildEnvGenerator/stderror.swift:10:1: error: inheritance from non-protocol type 'any TextOutputStream'
extension FileHandle: @retroactive TextOutputStream {
^
error: fatalError
BUILD FAILURE 5.10 macosSpm