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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 Transmission, reference 2.2.0 (e96dd3), with Swift 5.10 for macOS (SPM) on 23 Apr 2025 19:56:48 UTC.

Build Command

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

Build Log

========================================
RunAll
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Builder version: 4.60.2
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/nathantannar4/Transmission.git
Reference: 2.2.0
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/nathantannar4/Transmission
 * tag               2.2.0      -> FETCH_HEAD
HEAD is now at e96dd3d 2.2.0
Cloned https://github.com/nathantannar4/Transmission.git
Revision (git rev-parse @):
e96dd3d51c7bcdee74292e07dcde88865f270527
SUCCESS checkout https://github.com/nathantannar4/Transmission.git at 2.2.0
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $PWD
https://github.com/nathantannar4/Transmission.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.4.0.app xcrun swift build --arch arm64
Fetching https://github.com/nathantannar4/Engine
[11/1003] Fetching engine
Fetched https://github.com/nathantannar4/Engine from cache (1.47s)
Computing version for https://github.com/nathantannar4/Engine
Computed https://github.com/nathantannar4/Engine at 2.1.1 (0.37s)
Fetching https://github.com/swiftlang/swift-syntax
[1/70196] Fetching swift-syntax
Fetched https://github.com/swiftlang/swift-syntax from cache (3.32s)
Computing version for https://github.com/swiftlang/swift-syntax
Computed https://github.com/swiftlang/swift-syntax at 600.0.1 (2.55s)
Creating working copy for https://github.com/swiftlang/swift-syntax
Working copy of https://github.com/swiftlang/swift-syntax resolved at 600.0.1
Creating working copy for https://github.com/nathantannar4/Engine
Working copy of https://github.com/nathantannar4/Engine resolved at 2.1.1
error: the library 'Transmission' requires macos 10.13, but depends on the product 'Engine' which requires macos 10.15; consider changing the library 'Transmission' to require macos 10.15 or later, or the product 'Engine' to require macos 10.13 or earlier.
BUILD FAILURE 5.10 macosSpm