[CMake] Parallel moc for Qt files

[Konstantin Tokarev]

06.07.2017, 23:00, "Michael Jackson" <mike.jackson at bluequartz.net>:
> I have a large list of files that need to have Qt's 'moc' run on them
> (107 headers). I use all the normal CMake facilities for Qt based
> projects. I noticed that the generation of the moc files are done
> serially. Is there a flag or anything that I can use to run the
> generation in Parallel? I ask because each file takes about 3 seconds to
> run through moc. The code is heavily C++ templated which I think causes
> 'moc' to run more slowly. We have other places in the code where 'moc'
> must run and it does each file in the "blink of an eye".

Replace use of AUTOMOC with macros like qt5_generate_moc. Each moc file
will be generated by a separate custom command.

For example, I wrote 3 macros that wrap qt5_generate_moc for more
convenience [1], example usage is at [2].

[1] https://github.com/annulen/webkit/blob/qtwebkit-stable/Source/cmake/OptionsQt.cmake#L63
[2] https://github.com/annulen/webkit/blob/qtwebkit-stable/Source/WebCore/PlatformQt.cmake#L165

>
> Just curious.
>
> --
> Michael A. Jackson
> BlueQuartz Software, LLC
> [e]: mike.jackson at bluequartz.net
> --
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-- 
Regards,
Konstantin