[yocto] "(-)"??

[Martin Jansa]

null and nothing can also be matched in MACHINE names, so to make sure
people should use:

COMPATIBLE_MACHINE = "(^$)"

On Thu, Sep 21, 2017 at 8:41 AM, Peter Kjellerstedt <
peter.kjellerstedt at axis.com> wrote:

> > -----Original Message-----
> > From: yocto-bounces at yoctoproject.org [mailto:yocto-
> > bounces at yoctoproject.org] On Behalf Of Khem Raj
> > Sent: den 21 september 2017 07:15
> > To: Takashi Matsuzawa <tmatsuzawa at xevo.com>; yocto at yoctoproject.org
> > Subject: Re: [yocto] "(-)"??
> >
> > On 9/20/17 8:18 PM, Takashi Matsuzawa wrote:
> > > Hello.
> > > I am seeing some of the recipes contains lines like below.
> > >
> > >> COMPATIBLE_MACHINE = "(-)"
> > >
> > > Sorry being novice, but what is the intended effect of this line?
> > > I can see submit comments that this is for blacklisting but I am not
> > > sure how it works.  It simply means a '-' letter?
> >
> > COMAPTIBLE_MACHINE uses regexp syntax
>
> Which actually makes that a pretty weird COMPATIBLE_MACHINE,
> especially if it is intended for blacklisting. Given that it would
> match any machine with a dash in it, it would match, e.g., qemux86-64
> but not qemux86. It would also happen to match about half of our
> machines which happen to have dashes in their names.
>
> A more appropriate way to blacklist machines using COMPATIBLE_MACHINE
> would be something like:
>
> COMPATIBLE_MACHINE = "null"
>
> or:
>
> COMPATIBLE_MACHINE = "nothing"
>
> I found two occurrences of "(-)" being used as COMPATIBLE_MACHINE in
> meta-openembedded for Morty and Pyro, but they have been removed for
> Rocko. If you see them anywhere else, consider changing them.
>
> //Peter
>
> --
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