Problem with "Getting Started" project

Development C++ interoperability
1

I tried to follow the "Getting Started with C++ Interop" guide, but I can't get past "error: public headers ("include") directory path for 'CxxTest' is invalid or not contained in the target".

Any idea what I'm missing?

module.modulemap:

module CxxTest {
  header "CxxTest.hpp"
  requires cplusplus
}

Folder structure and Package.swift:

Screenshot
Screenshot2150×1500 317 KB

Many thanks! :)

2

Can you try moving module.modulemap and CxxTest.hpp into a new subdirectory called include? (Sources/CxxTest/include)

3

Oh that works, thanks! I'm curious, what's the reason for that?

4

AFAIU an implicit include subdirectory is always required when building targets that contain module.modulemap with SwiftPM. We do need the "Getting Started" document for C++ to be updated to reflect that.

5

Ah interesting! I'm short on time, but quickly put together an issue on GH.

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6

I have just added Update C++ Interop Getting Started Guide · Issue #63461 · apple/swift · GitHub which seems to be necessary to make it compile.

Unfortunately I could only compile it as a Swift Package from the command line. When I open that Swift Package in Xcode (via xed .), for some reason, Xcode seems to complain with

error: Driver threw unknown argument: '-cxx-interoperability-mode=swift-5.9' without emitting errors. (in target 'Swift-CANyonero' from project 'Swift-CANyonero')

although I downloaded and activated the latest Xcode toolchain from the 5.9/development branch.

How can I fix that?

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