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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 LLVM with Swift 6.0 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete

Build Log

========================================
RunAll
========================================
Builder version: 4.40.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/llvm-swift/llvmswift.git
Reference: master
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/llvm-swift/llvmswift
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
HEAD is now at ff7a881 Merge pull request #241 from Snowy1803/master
Cloned https://github.com/llvm-swift/llvmswift.git
Revision (git rev-parse @):
ff7a881eabf97cbd43006223494850a970761533
SUCCESS checkout https://github.com/llvm-swift/llvmswift.git at master
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $workDir
https://github.com/llvm-swift/llvmswift.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.3.0.app xcrun --toolchain org.swift.600202405261a swift build --arch arm64 -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete
[1/1] Compiling plugin GenerateManual
Building for debugging...
[1/4] Write sources
/Users/admin/builder/spi-builder-workspace/Sources/llvmshims/src/shim.cpp:1:10: fatal error: 'llvm-c/Core.h' file not found
    1 | #include "llvm-c/Core.h"
      |          ^~~~~~~~~~~~~~~
1 error generated.
[2/4] Compiling shim.cpp
[2/4] Write swift-version-6F35C1178C84523A.txt
Fetching https://github.com/llvm-swift/FileCheck.git
[1/479] Fetching filecheck
Fetched https://github.com/llvm-swift/FileCheck.git from cache (0.78s)
Computing version for https://github.com/llvm-swift/FileCheck.git
Computed https://github.com/llvm-swift/FileCheck.git at 0.2.6 (0.68s)
Fetching https://github.com/apple/swift-argument-parser
Fetching https://github.com/mxcl/Chalk.git
[1/81] Fetching chalk
[60/11760] Fetching chalk, swift-argument-parser
Fetched https://github.com/apple/swift-argument-parser from cache (4.13s)
Fetched https://github.com/mxcl/Chalk.git from cache (4.14s)
Computing version for https://github.com/mxcl/Chalk.git
Computed https://github.com/mxcl/Chalk.git at 0.5.0 (0.65s)
Computing version for https://github.com/apple/swift-argument-parser
Computed https://github.com/apple/swift-argument-parser at 1.4.0 (0.54s)
Creating working copy for https://github.com/llvm-swift/FileCheck.git
Working copy of https://github.com/llvm-swift/FileCheck.git resolved at 0.2.6
Creating working copy for https://github.com/apple/swift-argument-parser
Working copy of https://github.com/apple/swift-argument-parser resolved at 1.4.0
Creating working copy for https://github.com/mxcl/Chalk.git
Working copy of https://github.com/mxcl/Chalk.git resolved at 0.5.0
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: you may be able to install cllvm using your system-packager:
    brew install llvm
BUILD FAILURE 6.0 macosSpm
This is a staging environment. For live and up-to-date package information, visit swiftpackageindex.com.