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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 CiNiiKit, reference master (44e675), with Swift 6.1 for macOS (SPM) on 25 Apr 2025 16:54:51 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
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Builder version: 4.61.0
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/YutoMizutani/CiNiiKit.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/YutoMizutani/CiNiiKit
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at 44e6757 Merge pull request #62 from YutoMizutani/develop
Cloned https://github.com/YutoMizutani/CiNiiKit.git
Revision (git rev-parse @):
44e67570bb8ce7cf4a6e085232fa38f62c8e2b55
SUCCESS checkout https://github.com/YutoMizutani/CiNiiKit.git at master
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
Fetching https://github.com/YutoMizutani/CiNiiKit.git
[1/1371] Fetching ciniikit
Fetched https://github.com/YutoMizutani/CiNiiKit.git from cache (1.19s)
Creating working copy for https://github.com/YutoMizutani/CiNiiKit.git
Working copy of https://github.com/YutoMizutani/CiNiiKit.git resolved at master (44e6757)
error: 'ciniikit': Source files for target CiNiiKit should be located under 'Sources/CiNiiKit', or a custom sources path can be set with the 'path' property in Package.swift
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.1
Building package at path:  $PWD
https://github.com/YutoMizutani/CiNiiKit.git
https://github.com/YutoMizutani/CiNiiKit.git
error: Source files for target CiNiiKit should be located under 'Sources/CiNiiKit', or a custom sources path can be set with the 'path' property in Package.swift
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures
error: 'spi-builder-workspace': Source files for target CiNiiKit should be located under 'Sources/CiNiiKit', or a custom sources path can be set with the 'path' property in Package.swift
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.3.0.app xcrun swift build --arch arm64
error: 'spi-builder-workspace': Source files for target CiNiiKit should be located under 'Sources/CiNiiKit', or a custom sources path can be set with the 'path' property in Package.swift
BUILD FAILURE 6.1 macosSpm