Is there a way to use C++ interoperability?

[lbrattok]

There is a way of mixing Swift and C++ code using clang modules starting from swift 5.9. However, when trying to implement the C++ interoperability, xtool dev throws the error

error: 'hello': target at '/home/selin/Gary=/ios/Hello/Sources/Hello' contains mixed language source files; feature not supported
Error: exit(1)

Is there really no way to build such an app using xtools?