Re: [PATCH] classes/base.bbclass: add INCOMPATIBLE_MACHINE

[Denys Dmytriyenko <denis@denix.org>]

On Wed, Jul 07, 2010 at 07:57:15PM +0100, Phil Blundell wrote:
> On Wed, 2010-07-07 at 20:49 +0200, Frans Meulenbroeks wrote:
> > 2010/7/7 Frans Meulenbroeks <fransmeulenbroeks@gmail.com>:
> > > added INCOMPATIBLE_MACHINE
> > > we have COMPATIBLE_MACHINE but that does not allow to say that
> > > a package is supported by all except a certain machine.
> > > a regexp like "(?!arch)"
> > > This mechanism can be used to exclude certain machines.
> > > Idea is that in binutils and gcc you can use this to specify that
> > > a certain version does not support a certain machine
> > 
> > actually what I wanted to say in the commit message is that a regexp
> > like (?!arch) does not work.
> > \b(?!arch) or ^(?!arch) didn't work either and consulting #python did
> 
> This might just be an accident of wording, but you do realise that
> COMPATIBLE_MACHINE is tested against ${MACHINE} (i.e. not any of the
> ${xx_ARCH} variables), right?  If you want to test arches then you want
> ${COMPATIBLE_ARCH}.
> 
> I just did a quick test with (?!foo) in C_M and it seemed to work ok for
> me.  Specifically:
> 
> MACHINE = goodmach
> COMPATIBLE_MACHINE = "(?!badmach)"
> 
> works, whereas
> 
> MACHINE = badmach
> COMPATIBLE_MACHINE = "(?!badmach)"
> 
> is rejected.  What exactly goes wrong for you?

Just to confirm that the regular expression above does work, when tested 
against the correct variable, as I've been using it for quite a while in my 
recipes, e.g.:

http://arago-project.org/git/?p=arago.git;a=blob;f=recipes/images/arago-qte-image.bb;hb=HEAD

-- 
Denys