[bitbake-devel] Should multiconfig save build time?

[Alan Kozlay]

I wasn't completely clear in my origin post.  We actually do use the mc to
specify different DISTRO and IMAGE features.  But my point was that, for
recipies which are not affected by a change in those features, couldn't
such as recipe's workdir be leveraged by another mc conf.  But Richard's
response was clear.  That's not something which is supported, currently.

On Mon, Jul 1, 2019 at 10:13 AM chris.laplante at agilent.com <
chris.laplante at agilent.com> wrote:

> > We have need to generate 6 slighly different images, with different
> dedicated applications and use cases, but they're all destined for
> > the same hardware.
> > We have multiconfig set to build these 6 variants.  Clearly, they'll all
> share a majority of underlying packages.
> > While the bitbake initialization takes a long time (with multiconfig),
> we were under the impression that it could save time during the
> > actual build process because it could have the potential to reuse
> packages already built from mc A for mc B if the inputs to the recipes
> > are unchanged (if same xxx_FEATURES, same arch, etc.).
> >
> > This was a guess on our part since we initially didn't assign different
> tmp directories for each conf.  So, the <WORKDIR> didn't change
> > between mc builds.  That actually was causing some issues until we
> realized that separate tmp dirs was recommended for them.
> > Since they all now have separate tmp dirs, they clearly are not going to
> share work dirs, so, now we're questioning our original
> > assumption about any build-time speed benefit.
>
> Have you considered whether you actually need multiconfig in this case? If
> the arch and distro features don't change, you should just be able to have
> multiple image recipes.
>
> Chris
>


-- 
Alan Kozlay
VES Solutions, LLC
Alan Kozlay <alan.kozlay at ves.solutions>
DESK 443-595-7734
CELL 443-752-0323
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