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

[Ryan Barnett]

Arnout Vandecappelle <arnout at mind.be> wrote on 09/12/2013 04:57:04 PM:

> On 12/09/13 23:51, Ryan Barnett wrote:
> >  > > 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 
:)
> >
> 
>   Ah, yes indeed, sorry about that - I was trying to be too smart.

Happens to the best of us.

>   To save it in the .config, it needs a prompt, and to be able to take 
it 
> from the environment it needs a helper variable. Like BR2_DEFCONFIG.

I like to view BR2_EXTERNAL as something that is similar to "O=" which 
means
that I have the ability to change it at a moments notice. However, like it 

is done in mkmakefile when doing the following from within buildroot 
toplevel
source directory:

make O=/path/to/build defconfig

O= is stored in the generated makefile (as you know). However, it gets 
very
annoying to type BR2_EXTERNAL=/path/to/external and I don't always want to
export it as shell environment variable. Thus, adding that line to 
mkmakefile is handy since usually when you specify O= you are doing a 
specific build which BR2_EXTERNAL would definitely be a part of.

Thanks,
-Ryan


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