[cmake-developers] Faster automoc with parallel processing?

[Alexander Neundorf]

On Sunday 17 June 2012, Thomas Sondergaard wrote:
> Hi,
> 
> I've tested the new automoc feature and it certainly makes the
> developers life simpler and the CMakeLists.txt a lot simpler. Thanks for
> that, it is a great improvement.
> 
> On Windows with MSVC 2010 Generator, moc seems to be very slow and it is
> a paint to see it run sequentially. Could automoc be taught to do this
> in parallel using all the cores on the machine?

is "certainly" good enough as an answer ? ;-)

The thing is, for each target there is an accompanying automoc target. So if 
you have 4 cores, and 4 targets are built in parallel, then also 4 (auto)mocs 
should be running in parallel.

If you have only 1 target, consisting of many files, only 1 automoc target 
will be executed, processing one moc after the other.
Parallelizing this is not obvious. Simply running as many mocs on a machine as 
it has cores might lead to 16 mocs running on 4 cores (for 4 different 
targets).

So, it is possible, it is some implementation work, and I'm not clear on how 
to do the logic.

Do you have some ideas how to do this in a good way ?

Alex
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