Re: Re: Building OpenOffice.org with GNU make

On Wed, 13 Jan 2010 15:12:40 +0100
Martin Hollmichel <[email protected]> wrote:

> Mathias Bauer wrote:
> > So the only way to reuse CMake makefiles for a complete build is
> > recursively calling them or - as we do today in OOo - serialize the
> > process. I don't think that this is a matter of performance per se,
> > it's just that the benefit is missing we wanted to get from the new
> > "single make process" approach.
> >   
> no need to have this if you have unique targets, I guess ?

Mu. As long as you have a recursive build process, you have a lot of
implicit dependencies and those are hurting parallelization. On top of
that, process instantiation and file-I/O is very, very expensive on
Windows, the slowest and most problematic platform of all (both are used
extensively when doing recursion). This might not matter too much for a
full build that package maintainers usually do. But it matters very
much for the change->rebuild->change-cycle that devs usually do (Both
implicit deps and recursion over mostly noop build tasks really hurt
here).

BR,

Bjoern

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