should all class files be inherited by *something*?

should all class files be inherited by *something*?

[Robert P. J. Day]

  poking around the meta/classes/*.bbclass files and one looked a bit
odd -- scons.bbclass.  i was under the impression that class files
were supposed represent a *general* kind of functionality so i was
curious as to what this file represented.

  more to the point, it doesn't look like anything in oe-core inherits
that class.  so what exactly is its purpose?

  and following up on that, another example of that kind of file is
oelint.bbclass -- again, i don't see anything in oe-core that inherits
it.

rday

-- 

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

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

Re: should all class files be inherited by *something*?

[Paul Eggleton]

On Monday 02 April 2012 17:34:26 Robert P. J. Day wrote:
>   poking around the meta/classes/*.bbclass files and one looked a bit
> odd -- scons.bbclass.  i was under the impression that class files
> were supposed represent a *general* kind of functionality so i was
> curious as to what this file represented.
>
>   more to the point, it doesn't look like anything in oe-core inherits
> that class.  so what exactly is its purpose?

I believe it's for supporting the scons build system. scons isn't hugely 
popular though so I guess it's not surprising that nothing in OE-Core uses it.

>   and following up on that, another example of that kind of file is
> oelint.bbclass -- again, i don't see anything in oe-core that inherits
> it.

I think oelint.bbclass is a really out-of-date recipe lint checking tool. I 
wonder if anyone has used it lately. There could be value in bringing it up-
to-date though.

It's worth noting that we may have a number of classes that are supposed to be 
generally useful in OE-Core that aren't used within OE-Core itself. This is a 
good idea because it reduces the proliferation of different versions of such 
classes in multiple layers.

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre

Re: should all class files be inherited by *something*?

[Chris Larson]

On Mon, Apr 2, 2012 at 2:34 PM, Robert P. J. Day <rpjday@crashcourse.ca> wrote:
>  poking around the meta/classes/*.bbclass files and one looked a bit
> odd -- scons.bbclass.  i was under the impression that class files
> were supposed represent a *general* kind of functionality so i was
> curious as to what this file represented.
>
>  more to the point, it doesn't look like anything in oe-core inherits
> that class.  so what exactly is its purpose?
>
>  and following up on that, another example of that kind of file is
> oelint.bbclass -- again, i don't see anything in oe-core that inherits
> it.

There will *always* be classes that aren't inherited by anything. Look
at devshell. Some classes will always be opt-in only.
-- 
Christopher Larson

Re: should all class files be inherited by *something*?

[Robert P. J. Day]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1368 bytes --]

On Mon, 2 Apr 2012, Chris Larson wrote:

> On Mon, Apr 2, 2012 at 2:34 PM, Robert P. J. Day <rpjday@crashcourse.ca> wrote:
> >  poking around the meta/classes/*.bbclass files and one looked a bit
> > odd -- scons.bbclass.  i was under the impression that class files
> > were supposed represent a *general* kind of functionality so i was
> > curious as to what this file represented.
> >
> >  more to the point, it doesn't look like anything in oe-core inherits
> > that class.  so what exactly is its purpose?
> >
> >  and following up on that, another example of that kind of file is
> > oelint.bbclass -- again, i don't see anything in oe-core that inherits
> > it.
>
> There will *always* be classes that aren't inherited by anything. Look
> at devshell. Some classes will always be opt-in only.

  yes, i twigged to that seconds after i pressed the ENTER key.  it
*always* happens that way.  grrrrrrr.

rday

-- 

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

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