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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-once-macro, reference main (2bfa91), with Swift 5.9 for macOS (SPM) on 28 Mar 2025 22:22:46 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 4.60.1
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/davdroman/swift-once-macro.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/davdroman/swift-once-macro
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 2bfa916 Initial commit
Cloned https://github.com/davdroman/swift-once-macro.git
Revision (git rev-parse @):
2bfa91668d16723902cdc558c1a736e8787c91c6
SUCCESS checkout https://github.com/davdroman/swift-once-macro.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD
https://github.com/davdroman/swift-once-macro.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': package 'spi-builder-workspace' is using Swift tools version 6.0.0 but the installed version is 5.9.0
BUILD FAILURE 5.9 macosSpm