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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 CStack with Swift 5.10 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.35.0
Interrupt handler set up.
========================================
Checkout
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Clone URL: https://github.com/ml-archive/cstack.git
Reference: 1.0.1
Initialized empty Git repository in /Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/ml-archive/cstack
 * tag               1.0.1      -> FETCH_HEAD
HEAD is now at 213b69f Make CStack product
Cloned https://github.com/ml-archive/cstack.git
Revision (git rev-parse @):
213b69f9b9666b3dea954939f54cbe0fc6800c1d
SUCCESS checkout https://github.com/ml-archive/cstack.git at 1.0.1
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "cstack",
      "name": "CStack",
      "url": "https://github.com/ml-archive/cstack.git",
      "version": "unspecified",
      "path": "/Users/builder/builds/TDmZkXJm/3/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/cstack",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/ml-archive/cstack.git
[1/16] Fetching cstack
Fetched https://github.com/ml-archive/cstack.git from cache (0.27s)
Creating working copy for https://github.com/ml-archive/cstack.git
Working copy of https://github.com/ml-archive/cstack.git resolved at 1.0.1 (213b69f)
warning: 'cstack': ignoring declared target(s) 'CStack' in the system package
warning: '.resolve-product-dependencies': dependency 'cstack' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.10
Building package at path:  $workDir
https://github.com/ml-archive/cstack.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun swift build --arch arm64
warning: 'spi-builder-workspace': ignoring declared target(s) 'CStack' in the system package
error: The package does not contain a buildable target.
Add at least one `.target` or `.executableTarget` to your `Package.swift`.
warning: 'spi-builder-workspace': ignoring declared target(s) 'CStack' in the system package
error: The package does not contain a buildable target.
Add at least one `.target` or `.executableTarget` to your `Package.swift`.
BUILD FAILURE 5.10 macosSpm