[OE-core] a question about recipe style

[Robert P. J. Day]

On Wed, 9 Jul 2014, Richard Purdie wrote:

> On Tue, 2014-07-08 at 11:34 -0400, Robert P. J. Day wrote:
> >   perusing the bitbake user manual, and ran across the section
> > discussing the "override style" operators _append, _prepend and
> > _remove, and thought i'd go looking through the OE recipes for an
> > actual example of the use of "_remove", and the only example i found
> > is in meta/recipes-extended/newt, but it looks a bit awkward, so i
> > just want to know about recommended style.
> >
> >   there are two recipe files there -- libnewt_0.52.17.bb and
> > libnewt-python_0.52.17.bb -- with the following structure. that first
> > recipe file contains (among other things) the following:
> >
> > PACKAGES_prepend = "whiptail "
> > ...
> > FILES_whiptail = "${bindir}/whiptail"
> >
> >   ok, so that recipe defines an additional package, and adds a single
> > file to that package, whereupon the second recipe file contains:
> >
> > require recipes-extended/newt/libnewt_${PV}.bb
> > ...
> > PACKAGES_remove = "whiptail"
> >
> >   it just seems awkward for recipe 1 to explicitly add a package, only
> > for recipe 2 to include that recipe file, and subsequently remove that
> > package.
> >
> >   it's not a big deal, but from a style perspective, i would have
> > thought one would first create a generic libnewt.inc file with common
> > content, then define the two recipe files off of that. does that make
> > sense in terms of best programming principles?
>
> Yes, it does seem like an odd way to have written the recipes. I'd be
> happy enough to see some cleanup patches...

  maybe i'll give that as an assignment to my students. :-)  that
oddity clearly isn't a big deal since it works just fine, i just
thought it looked strange enough that i wanted to make sure there
wasn't something subtle going on i didn't understand.

  movin' on ...

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
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