Issue with target which have binaryTarget dependency

[Kyle-Ye]

Due to an upstream SwiftPM issue.

If a target has a dependency on binaryTarget. Then the call of PackageManager.getSymbolGraph to that target will get a directory contains no symbol graph.

It will break PackageManager.getSymbolGraph's client such as swift-docc-plugin.

The downstream user can generate doc using swift build and call docc convert to generate documentation. But if they migrate to swift-docc-plugin or swift-docc-plugin based service like SwiftPackageIndex, the documentation build will fail.

// ✅ Build Package Documentation via Xcode GUI

// ✅ Build Package Documentation manually
swift build --target DemoKit \
  -Xswiftc -emit-symbol-graph \
  -Xswiftc -emit-symbol-graph-dir -Xswiftc "./symbol-graph"

docc convert --additional-symbol-graph-dir ./symbol-graph ...

// ❌ Build Package Documentation via swift-docc-plugin
swift package generate-documentation --target DemoKit

Checklist

• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue.

Expected behavior

Success

Actual behavior

"<unknown>:0: error: missing required module \'MMKV\'\nError: Failed to load the module \'DemoKit\'. Are you missing build dependencies or include/framework directories?\nSee the previous error messages for details. Aborting.\n"

Steps to Reproduce

1. Download the following DemoKit.zip package
2. Run swift package generate-documentation --target DemoKit --verbose and no documentation will be created.

DemoKit.zip

Note: Here I use MMKV.xcframework as an example but any binary framework would have the same issue. The binary framework have nothing special here.

Swift-DocC Plugin Version Information

Swift-DocC plugin version: 1.3.0
Swift Compiler version: 5.10