[Bug] Importing packages with internal targets results in 'missing required module' error

[robertlis-qz]

What happened?

I am trying to use spm_pkg to import RxSwift as a Swift package in my otherwise Cocoapods based project as follows:

  spm_pkg "RxSwift",
          :url => "https://github.com/ReactiveX/RxSwift.git",
          :version => "6.9.0",
          :products => ["RxSwift", "RxCocoa", "RxRelay", "RxBlocking", "RxTest"]

However, using RxSwift in my internal pod by declaring it as a dependency

  s.spm_dependency "RxSwift/RxRelay"
  s.spm_dependency "RxSwift/RxCocoa"
  s.spm_dependency "RxSwift/RxSwift"

results in missing required module RxCocoaRuntime compilation error wherever RxSwift is imported. Having looked at RxSwift's https://github.com/ReactiveX/RxSwift/blob/main/Package%40swift-5.9.swift it seems that RxCocoaRuntime is an internal target which does not seem to generate .swiftmodule when build. Generated .xcconfig files of my internal pods do appear to look for it:

OTHER_SWIFT_FLAGS =
...
-fmodule-map-file="${GENERATED_MODULEMAP_DIR}/RxCocoaRuntime.modulemap" -Xcc
...

Which results in a compilation error. Not quite sure how to work around this.

Anything else?

No response