[Buildroot] [PATCH 2/2] core/instrumentation: shave minutes off the build time

[Thomas Petazzoni]

Hello,

On Fri, 23 Mar 2018 23:39:47 +0100, Arnout Vandecappelle wrote:

> > The current timestamp-based approach not guaranteeing an accurate list is
> > problematic for many such uses. And as you already mentioned, since we don't have
> > full control over the build steps done in any given package, we don't know which
> > timestamps they will use. There may be very good reasons to install certain
> > files with their original timestamp and not the one from the build.  
> 
>  We could revert to the original before/after file list approach, and just use
> something like "stat -c '%N %Y %f'" instead of md5sum.
> 
>  Though I certainly like Trent's idea of installing each package in a separate
> directory, too. With PPS we're more or less there anyway. We'd just need to step
> up the adoption rate of PPS then :-)

With the PPS patches I posted, we are not installing each package to a
separate folder, but to a folder where all the package dependencies
have already been installed.

Of course, we could change to a model where the per-package staging and
target folders really only contain what the package has installed, and
have a separate per-package SDK, in which we do the "accumulation" of
the dependencies.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com