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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-testing, reference 6.1.0 (43b6f8), with Swift 5.9 for macOS (SPM) on 3 May 2025 03:56:40 UTC.

Build Command

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

Build Log

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RunAll
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Builder version: 4.61.3
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/swiftlang/swift-testing.git
Reference: 6.1.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/swiftlang/swift-testing
 * tag               6.1.0      -> FETCH_HEAD
HEAD is now at 43b6f88 [6.1] Suppress `.unsafeFlags()` in Package.swift when tagging for release. (#993)
Cloned https://github.com/swiftlang/swift-testing.git
Revision (git rev-parse @):
43b6f88e2f2712e0f2a97e6acc75b55f22234299
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/swiftlang/swift-testing.git at 6.1.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD
https://github.com/swiftlang/swift-testing.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