Re: [OE-core] [PATCHv3 2/5] bitbake.conf: Add all layers (from BBLAYERS) to PSEUDO_IGNORE_PATHS

["Richard Purdie" <richard.purdie@linuxfoundation.org>]

On Tue, 2020-12-08 at 08:48 +0000, Paul Barker wrote:
> On Mon, 7 Dec 2020 at 12:46, Richard Purdie
> <richard.purdie@linuxfoundation.org> wrote:
> > On Mon, 2020-12-07 at 12:04 +0000, Paul Barker wrote:
> > > On Mon, 7 Dec 2020 at 10:29, Paul Barker <pbarker@konsulko.com>
> > > wrote:
> > > To follow up some more: The entries in PSEUDO_IGNORE_PATHS are
> > > treated
> > > as string prefixes within pseudo. So if
> > > "/home/pbarker/Projects/Yocto/meta-linux-mainline" is added to
> > > the
> > > ignore list it will exclude not just
> > > "/home/pbarker/Projects/Yocto/meta-linux-mainline/build" but also
> > > ""/home/pbarker/Projects/Yocto/meta-linux-mainline-build".
> > > 
> > > I wonder if some more of those entries should have trailing
> > > slashes.
> > 
> > In most (all?) cases it was very deliberate FWIW...
> 
> That does make sense. Ignoring "${COREBASE}/meta" will also ignore
> most layers unpacked or cloned within the poky directory as their
> names start with "meta". However that does miss layers if you use a
> different directory structure which is what Peter's patch addresses
> (though I'm still not sure if there's an actual build failure with
> some layers which it is intended to fix or if it's just to make
> things
> consistent).
> 
> The issue comes when you clone a layer as the top-level of your
> working tree and build within that. That's how I work with
> meta-sancloud & meta-linux-mainline. It's also what happens if you
> build using the kas config in meta-raspberrypi. So it's not uncommon.
> 
> Investigating why the layer directories are being ignored I found
> this
> commit added the ignore of "${COREBASE}/meta":
> 
>     commit e0cb6dd689a362d8433caa14cc5a9fdd5eb44923
>     Author: Richard Purdie <richard.purdie@linuxfoundation.org>
>     Date:   Wed Oct 7 23:08:45 2020 +0100
> 
>        bitbake.conf: Extend PSEUDO_IGNORE_PATHS to ${COREBASE}/meta
> 
>         Unfortunately, .pyc files can be generated in meta/lib/oe
> which corrupt the pseudo
>         database so we need to extend the ignore list to cover this
> as well.
> 
>         Signed-off-by: Richard Purdie <
> richard.purdie@linuxfoundation.org>
> 
> Could we instead ignore "${LAYERDIR}/lib" for each layer?
> 
> An alternative would be to detect the case where TOPDIR or TMPDIR is
> beneath an entry in BBLAYERS and handle that as a special case.


I'm wondering if we should just set:

sys.dont_write_bytecode=True

since the number of places we'd get significant speed from this is
limited. We probably only need to do this in any pseudo using code
paths?

Cheers,

Richard