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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 WebUI, reference 3.1.0 (efc8e2), with Swift 5.10 for macOS (SPM) on 7 May 2025 19:50:23 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.4.0.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.
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Checkout
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Clone URL: https://github.com/cybozu/WebUI.git
Reference: 3.1.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/cybozu/WebUI
 * tag               3.1.0      -> FETCH_HEAD
HEAD is now at efc8e2a Merge pull request #58 from cybozu/generate-pdf-from-webview
Cloned https://github.com/cybozu/WebUI.git
Revision (git rev-parse @):
efc8e2a58de3959536156bb2bc206828613f7996
SUCCESS checkout https://github.com/cybozu/WebUI.git at 3.1.0
========================================
Build
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Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $PWD
https://github.com/cybozu/WebUI.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.4.0.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 5.10.0
BUILD FAILURE 5.10 macosSpm