[Buildroot] Antw: build speedup possible?

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Andreas Naumann,

On Mon, 10 Feb 2014 12:31:08 +0100, Andreas Naumann wrote:

> > If we want to get this to the next level, someone need to experiment
> > with per-package sysroot. Of course, this would be a long experiment,
> > without necessarily at the end the guarantee that we will accept it,
> > because it may be too complex to match Buildroot simplicity principle.
> 
> as I said, we have hacked br to a per-package sysroot in the past. This 
> was in order to create isolated ipkgs and did its job. Even if we dont 
> solve any of the dependency issues with that, it could be a starting 
> point. If this is of  interest I can try to go further with it.

Investigation in this area are definitely welcome. But as I said, we
cannot guarantee that it will be merged: it will highly depends on how
much additional complexity it will add.

> And for the depency issue, how does OE solve it?

I don't know exactly. The author of oe-lite (http://oe-lite.org/) told
me that they don't do per-package sysroot (which in his opinion is
fundamentally wrong when you do parallel build of multiple packages),
and it indeed seems to be the case from a quick look at what Yocto is
doing. That being said, my knowledge of OE/Yocto internals is almost
non-existent, so I don't know how they solve this problem.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com