Speed up build phase with "make -j"

[Vincent Lefevre]

On 2007-10-30 16:20:18 +0100, Markus Weissmann wrote:
> On 30.10.2007, at 13:52, Vincent Lefevre wrote:
>> The bug could also be reported upstream, so that a ".NOTPARALLEL:"
>> is added to the Makefile.
>
> Well, this simply is not going to work -- this has to be an opt-in,
> not an opt-out option!

That's not the point. Whether MacPorts uses a parallel build by default
or not, a Makefile should be correct (either by supporting parallel
build or by having a ".NOTPARALLEL:"). If it is not, this is a bug.
If such bugs are not reported upstream, you're not going anywhere
(experience shows that in general, upstream doesn't test parallel
builds).

> If you do not know if a parallel build will work for a port, you must 
> assume it won't.

I disagree. Port maintainers should test their port to see if they work
with "make -j".

> Once upon a day when we see that 80% of our ports all have that
> "build_in_parallel yes" option set, we can make it the default, but
> not as long as only _very_ few do.

Yes, but how can you hope that 80% of ports will have
"build_in_parallel yes" if one assumes that parallel build doesn't work?

-- 
Vincent Lefèvre <vincent at vinc17.org> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)