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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 Stacked with Swift 5.9 for macOS (SPM).

Build Command

env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.35.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ml-archive/stacked.git
Reference: 0.3.1
Initialized empty Git repository in /Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.git/
From https://github.com/ml-archive/stacked
 * tag               0.3.1      -> FETCH_HEAD
HEAD is now at b510bcb Merge pull request #20 from nodes-vapor/feature/add-library
Cloned https://github.com/ml-archive/stacked.git
Revision (git rev-parse @):
b510bcbd5fb3f84f3a78540a2c508f477ec44de8
SUCCESS checkout https://github.com/ml-archive/stacked.git at 0.3.1
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             5.9
Building package at path:  $workDir
https://github.com/ml-archive/stacked.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-15.2.0.app xcrun swift build --arch arm64
Building for debugging...
error: emit-module command failed with exit code 1 (use -v to see invocation)
[1/2] Emitting module Stacked
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "shim.h"
        ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/cstack/shim.h:4:10: error: 'stack.h' file not found
#include "stack.h"
         ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Stacked/Stacked.swift:1:8: error: could not build Objective-C module 'CStack'
import CStack
       ^
[2/2] Compiling Stacked Stacked.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "shim.h"
        ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/cstack/shim.h:4:10: error: 'stack.h' file not found
#include "stack.h"
         ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Stacked/Stacked.swift:1:8: error: could not build Objective-C module 'CStack'
import CStack
       ^
error: fatalError
Fetching https://github.com/nodes-vapor/cstack.git from cache
Fetched https://github.com/nodes-vapor/cstack.git (0.21s)
Computing version for https://github.com/nodes-vapor/cstack.git
Computed https://github.com/nodes-vapor/cstack.git at 1.0.1 (0.32s)
Creating working copy for https://github.com/nodes-vapor/cstack.git
Working copy of https://github.com/nodes-vapor/cstack.git resolved at 1.0.1
warning: 'cstack': ignoring declared target(s) 'CStack' in the system package
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: you may be able to install cstack using your system-packager:
    brew install vapor/tap/cstack
[0/1] Planning build
Building for debugging...
error: emit-module command failed with exit code 1 (use -v to see invocation)
[1/2] Emitting module Stacked
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "shim.h"
        ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/cstack/shim.h:4:10: error: 'stack.h' file not found
#include "stack.h"
         ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Stacked/Stacked.swift:1:8: error: could not build Objective-C module 'CStack'
import CStack
       ^
[2/2] Compiling Stacked Stacked.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "shim.h"
        ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/.build/checkouts/cstack/shim.h:4:10: error: 'stack.h' file not found
#include "stack.h"
         ^
/Users/builder/builds/UKfvDsi8u/2/finestructure/swiftpackageindex-builder/spi-builder-workspace/Sources/Stacked/Stacked.swift:1:8: error: could not build Objective-C module 'CStack'
import CStack
       ^
error: fatalError
warning: 'cstack': ignoring declared target(s) 'CStack' in the system package
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: you may be able to install cstack using your system-packager:
    brew install vapor/tap/cstack
BUILD FAILURE 5.9 macosSpm