[Buildroot] [PATCH 2/3] Add support for BR2_EXTERNAL

Ryan Barnett rjbarnet at rockwellcollins.com
Thu Sep 12 21:51:51 UTC 2013


Arnout Vandecappelle <arnout at mind.be> wrote on 09/12/2013 04:41:49 PM:

> On 12/09/13 23:30, Ryan Barnett wrote:
> > Arnout Vandecappelle <arnout at mind.be> wrote on 09/12/2013 04:05:18 PM:
> >
> >  > On 11/09/13 04:03, rjbarnet at rockwellcollins.com wrote:
> >  > > Thomas Petazzoni <thomas.petazzoni at free-electrons.com> wrote on
> >  > > 09/08/2013 08:15:28 AM:
> >  > >
> >  > >  >
> >  > >  > Signed-off-by: Thomas Petazzoni 
<thomas.petazzoni at free-electrons.com>
> >  > >  > ---
> >  > >  >  Config.in   |  6 ++++--
> >  > >  >  Makefile    | 29 +++++++++++++++++++++++++----
> >  > >  >  docs/manual/manual.mk |  2 +-
> >  > >
> >  > > One idea that I have, is for the make file that is genreated for 
the an
> >  > > external output directory, if we could preserve the the value of
> >  > > BR2_EXTERNAL
> >  > > as follows.
> >  >
> >  >   Thomas's patch already does that, because BR2_EXTERNAL is stored 
in the
> >  > config file.
> >  >
> >
> > I don't believe it gets stored in the config since Config.in pulls
> > the variable in from the shell's or make's environment.
> >
> > +config BR2_EXTERNAL
> > +       string
> > +       option env="BR2_EXTERNAL"
> >
> > In order to utilize the BR2_EXTERNAL feature I must have BR2_EXTERNAL
> > either exported into my environment or be called as
> 
>   The Makefile exports it in the environment of the Kconfig targets. So 
> once it is in the .config, it will stay there. Try it and you'll see :-)

I have looked as I'm experiment with this and it definitely isn't there :) 

Also according to the documentation you need to define it every time :)

> >
> > 'make BR2_EXTERNAL=/some/path <target>'
> >
> >
> > When utilizing the BR2_EXTERNAL I usual want to use some defconfig 
from
> > my BR2_EXTERNAL so it adding it the makefile that is generated in your
> > build directory when specifying O= would be extermely useful as that
> > way I can switch shells and my definition of BR2_EXTERNAL would still
> > be present.
> >
> > 'make O=/build/path BR2_EXTERNAL=/path/to/external defconfig'
> 
>   In this particular case, you're not using the Makefile in the output 
> dir but only in the buildroot dir so it's not relevant.
> 
>   The only case where it would be relevant is when you have an existing 
> output directory, you remove the .config first, and then you do a
> make foo_defconfig. Seems a bit an unlikely scenario.
> 
>   Regards,
>   Arnout

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