[yocto] under what circumstances is BBCLASSEXTEND = "native" required in a recipe?

[Robert P. J. Day]

On Sat, 11 Aug 2012, Chris Larson wrote:

> On Sat, Aug 11, 2012 at 10:03 AM, Robert P. J. Day
> <rpjday at crashcourse.ca> wrote:
> >   however, the "chrpath" command is not listed in bitbake as part of
> > ASSUME_PROVIDED, and its recipe includes the line
> >
> >   BBCLASSEXTEND = "native"
> >
> > that's what's confusing -- if the QS guide demands that the user
> > install "chrpath" manually, what is the subsequent value of its recipe
> > dictating that it be natively buildable?
>
> At a guess, it's possible that not all recipes that needed
> chrpath-native had an explicit dependency on it, or similar. Your
> question is specific to chrpath, not at all general to
> BBCLASSEXTEND. Adding native to bbclassextend means that a -native
> version of the recipe can be built. The question of why certain
> things are expected on the host vs built from that recipe is an
> entirely different one.

  i believe i see your logic.  just to clarify, it seems somewhat
redundant to a) *require* the developer to manually install certain
commands on the yocto dev host, and b) simultaneously have a recipe
for that command that allows it to be built natively, in case yocto
needs it.

  does that make sense?  i'm assuming the sole reason to support a
-native build in a recipe is for yocto use on the dev host, right?

rday

p.s.  as a more obvious example, consider "git".  it's now
"ASSUME_PROVIDED", and listed in the quick start guide as required on
the dev host, but it also still supports a native build.  i'm just
trying to clarify that, in cases like that, supporting the -native
build is no longer necessary.  or am i missing something?

-- 

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

Twitter:                                       http://twitter.com/rpjday
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