Build Information
Failed to build swift-rfc-5321, reference 0.3.4 (5ecbf0), with Swift 6.0 for macOS (SPM) on 23 Apr 2026 19:55:03 UTC.
Build Command
env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64Build Log
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RunAll
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Builder version: 4.70.0
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/swift-ietf/swift-rfc-5321.git
Reference: 0.3.4
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/swift-ietf/swift-rfc-5321
* tag 0.3.4 -> FETCH_HEAD
HEAD is now at 5ecbf02 Fix CI workflow to use Xcode 26.0 and macOS 26
Cloned https://github.com/swift-ietf/swift-rfc-5321.git
Revision (git rev-parse @):
5ecbf020e2fc35c9fabe609369b35eb7735b387c
SUCCESS checkout https://github.com/swift-ietf/swift-rfc-5321.git at 0.3.4
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Build
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Selected platform: macosSpm
Swift version: 6.0
Building package at path: $PWD
https://github.com/swift-ietf/swift-rfc-5321.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': package 'spi-builder-workspace' is using Swift tools version 6.2.0 but the installed version is 6.0.3
error: 'spi-builder-workspace': package 'spi-builder-workspace' is using Swift tools version 6.2.0 but the installed version is 6.0.3
BUILD FAILURE 6.0 macosSpm