[Interest] creating QML module in a subdirectory of backing target

[Stefan Seefeld]

hello,

in a large CMake / Qt project of mine, I'm building a (shared) library in
some directory `A`.
Now I want to add a QML module for that, but due to various constraints
want to do that in a subdirectory `A/qml`.
That is, I have

A/
├── CMakeLists.txt
├── qml
│   ├── CMakeLists.txt

where `A/CMakeLists.txt` calls `addLibrary(A ...)`, and
`A/qml/CMakeLists.txt` calls `qt_add_qml_module(A ...)`

This eventually bails with the error

```
... No rule to make target '.../A/A_qmltyperegistrations.cpp`, needed by '
CMakeFiles/A.dir/a_qmltyperegistrations.cpp.o'
```
If I merge the definition of `qml_add_qml_module` in the outer
CMakeLists.txt file, everything is compiling fine.
Am I missing something ? Is this is known limitation of the build logic ?

Thanks for any hints,

-- 

      ...ich hab' noch einen Koffer in Berlin...
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