[Qbs] Rule.Return dynamic list for outputArtifacts

[Richard Weickelt]

> However, yesterday I came across a small
> sip-file, and the generated cpp-files turned out to be not 6, but only 5.
> Naturally, my rule failed.
> 
> Question: how can I resolve my situation?
> Of course, I can tell the sip-generator to create fewer cpp-files (parameter
> -j), but I would like to understand - are there other ways?
> For example, to ignore section
> {
>    filePath: generatedFilesDir + "/sip" + moduleSipName + "part5.cpp",
>    fileTags: ["cpp"],
>    cpp: {
>      cxxFlags: sipCxxFlags
>    }
> }
> if the file ("sip" + moduleSipName + "part5.cpp") does not exist

The number of output files depends on the input file content and cannot be
known in advance? Then maybe this thread gives you some ideas:
https://www.mail-archive.com/qbs@qt-project.org/msg01022.html

The situation hasn't changed since then.