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From: Richard Purdie <richard.purdie@linuxfoundation.org>
To: Robert Yang <liezhi.yang@windriver.com>
Date: Wed, 11 Sep 2013 11:10:28 +0100
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Subject: Re: [RFC PATCH] bitbake.conf: Stop providing ${P} and ${PF} by default
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On Wed, 2013-09-11 at 17:31 +0800, Robert Yang wrote:
> 
> On 09/10/2013 10:08 PM, Richard Purdie wrote:
> > On Tue, 2013-09-10 at 15:33 +0800, Robert Yang wrote:
> >> Thanks, Can we provide a replacement for the "bitbake PN-PV" since it is
> >> useful, for example, can we support the PREFERRED_VERSION_${PN} in the env
> >> in the future ? There is a similar bug:
> >>
> >> https://bugzilla.yoctoproject.org/show_bug.cgi?id=4965
> >
> > If you set BB_PRESERVE_ENV=1 you can set PREFERRED_VERSION_xxx from the
> > environment so this should already be possible?
> >
> 
> It seems that the BB_PRESERVE_ENV=1 doesn't work, but we use the
> BB_ENV_EXTRAWHITE, for example:
> 
> $ export BB_ENV_EXTRAWHITE="$BB_ENV_EXTRAWHITE PREFERRED_VERSION_make"
> $ export PREFERRED_VERSION_make="3.81",
> 
> Then it works, maybe something is wrong with the BB_PRESERVE_ENV.

It is broken, yes, I've sent out a patch to fix it. There is one other
problem, you can't use "-" in a shell environment variable so you can't
do:

PREFERRED_VERSION_make-native = xxx

which is annoying. We might want to add some kind of mangling mechanism
like a double underscore translating to a dash or something...

Cheers,

Richard