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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 CZlib with Swift 5.9 for macOS (SPM).

Build Command

Build command unavailable

Build Log

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RunAll
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Builder version: 4.28.4
Interrupt handler set up.
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Checkout
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Clone URL: https://github.com/Octadero/CZlib.git
Reference: 0.0.5
Initialized empty Git repository in /Users/admin/builds/h8344Zi3/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/Octadero/CZlib
 * tag               0.0.5      -> FETCH_HEAD
HEAD is now at 363851e Init package.
Cloned https://github.com/Octadero/CZlib.git
Revision (git rev-parse @):
363851ef6ffa00c4fe74c937a8a877a6b8f02c17
SUCCESS checkout https://github.com/Octadero/CZlib.git at 0.0.5
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ResolveProductDependencies
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Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builds/h8344Zi3/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builds/h8344Zi3/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "czlib",
      "name": "CZlib",
      "url": "https://github.com/Octadero/CZlib.git",
      "version": "unspecified",
      "path": "/Users/admin/builds/h8344Zi3/1/finestructure/swiftpackageindex-builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/CZlib",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/Octadero/CZlib.git from cache
Fetched https://github.com/Octadero/CZlib.git (0.19s)
Creating working copy for https://github.com/Octadero/CZlib.git
Working copy of https://github.com/Octadero/CZlib.git resolved at 0.0.5
warning: 'czlib': ignoring declared target(s) 'CZlib' in the system package
warning: '.resolve-product-dependencies': dependency 'czlib' is not used by any target
Found 0 product dependencies
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Build
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Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $PWD/checkout
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0-Beta.app xcrun swift build --arch arm64
warning: 'spi-builder-workspace': ignoring declared target(s) 'CZlib' 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) 'CZlib' 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 5.9 macosSpm