curious about setting of PROVIDES in bitbake.conf

curious about setting of PROVIDES in bitbake.conf

[Robert P. J. Day]

  from current bitbake.conf file:

PROVIDES = ""
PROVIDES_prepend = "${PN} "

is there a reason that PROVIDES is set to null, only to immediately
set it based on the following line? is there some subtle issue this is
meant to address?

rday

-- 

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

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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Re: curious about setting of PROVIDES in bitbake.conf

[Paul Eggleton]

On Wednesday 18 June 2014 09:10:00 Robert P. J. Day wrote:
>   from current bitbake.conf file:
> 
> PROVIDES = ""
> PROVIDES_prepend = "${PN} "
> 
> is there a reason that PROVIDES is set to null, only to immediately
> set it based on the following line? is there some subtle issue this is
> meant to address?

I think the intention is to set the initial value to blank, and ensure that 
${PN} is the first item in the list (since _prepend gets applied later). If you 
just simply had PROVIDES = "${PN}" then it could be overridden somewhere else 
such that ${PN} was not in PROVIDES at all, which would be counter-intuitive.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre

Re: curious about setting of PROVIDES in bitbake.conf

[Robert P. J. Day]

On Wed, 18 Jun 2014, Paul Eggleton wrote:

> On Wednesday 18 June 2014 09:10:00 Robert P. J. Day wrote:
> >   from current bitbake.conf file:
> >
> > PROVIDES = ""
> > PROVIDES_prepend = "${PN} "
> >
> > is there a reason that PROVIDES is set to null, only to immediately
> > set it based on the following line? is there some subtle issue this is
> > meant to address?
>
> I think the intention is to set the initial value to blank, and
> ensure that ${PN} is the first item in the list (since _prepend gets
> applied later). If you just simply had PROVIDES = "${PN}" then it
> could be overridden somewhere else such that ${PN} was not in
> PROVIDES at all, which would be counter-intuitive.

  ah, of course, i should have thought of that. duh.

rday

-- 

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

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================