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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 Markdown, reference main (ad895d), with Swift 6.0 for macOS (SPM) on 26 Nov 2024 19:12:05 UTC.

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.1.0.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

Build Log

========================================
RunAll
========================================
Builder version: 4.58.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/twostraws/markdown.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/twostraws/markdown
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at ad895d1 Updated README.
Cloned https://github.com/twostraws/markdown.git
Revision (git rev-parse @):
ad895d1cd77d4f6b6775497cbff7b0c5995f7485
SUCCESS checkout https://github.com/twostraws/markdown.git at main
========================================
ResolveProductDependencies
========================================
Resolving dependencies ...
{
  "identity": ".resolve-product-dependencies",
  "name": "resolve-dependencies",
  "url": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "version": "unspecified",
  "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies",
  "dependencies": [
    {
      "identity": "markdown",
      "name": "Markdown",
      "url": "https://github.com/twostraws/markdown.git",
      "version": "unspecified",
      "path": "/Users/admin/builder/spi-builder-workspace/.resolve-product-dependencies/.build/checkouts/markdown",
      "dependencies": [
      ]
    }
  ]
}
Fetching https://github.com/twostraws/markdown.git
[1/21] Fetching markdown
Fetched https://github.com/twostraws/markdown.git from cache (0.58s)
Creating working copy for https://github.com/twostraws/markdown.git
Working copy of https://github.com/twostraws/markdown.git resolved at main (ad895d1)
warning: '.resolve-product-dependencies': dependency 'markdown' is not used by any target
Found 0 product dependencies
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/twostraws/markdown.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.1.0.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
Building for debugging...
[0/2] Write sources
[1/2] Write swift-version--7754E27361AE5C74.txt
error: emit-module command failed with exit code 1 (use -v to see invocation)
[3/5] Emitting module Markdown
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "discount.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/discount/discount.h:1:10: error: 'mkdio.h' file not found
1 | #include <mkdio.h>
  |          `- error: 'mkdio.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Markdown/Markdown.swift:1:8: error: could not build Objective-C module 'Discount'
 1 | import Discount
   |        `- error: could not build Objective-C module 'Discount'
 2 |
 3 | /// Stores the compiled Markdown for a string. This must be a class because it has a custom deinitializer to release the underlying memory.
[4/5] Compiling Markdown Markdown.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "discount.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/discount/discount.h:1:10: error: 'mkdio.h' file not found
1 | #include <mkdio.h>
  |          `- error: 'mkdio.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Markdown/Markdown.swift:1:8: error: could not build Objective-C module 'Discount'
 1 | import Discount
   |        `- error: could not build Objective-C module 'Discount'
 2 |
 3 | /// Stores the compiled Markdown for a string. This must be a class because it has a custom deinitializer to release the underlying memory.
[5/5] Compiling Markdown ParseOptions.swift
<module-includes>:1:9: note: in file included from <module-includes>:1:
1 | #import "discount.h"
  |         `- note: in file included from <module-includes>:1:
2 |
/Users/admin/builder/spi-builder-workspace/Sources/discount/discount.h:1:10: error: 'mkdio.h' file not found
1 | #include <mkdio.h>
  |          `- error: 'mkdio.h' file not found
2 |
/Users/admin/builder/spi-builder-workspace/Sources/Markdown/Markdown.swift:1:8: error: could not build Objective-C module 'Discount'
 1 | import Discount
   |        `- error: could not build Objective-C module 'Discount'
 2 |
 3 | /// Stores the compiled Markdown for a string. This must be a class because it has a custom deinitializer to release the underlying memory.
warning: failed to retrieve search paths with pkg-config; maybe pkg-config is not installed
warning: you may be able to install libmarkdown using your system-packager:
    brew install discount
BUILD FAILURE 6.0 macosSpm