Re: CVS commit: src/sys/sys

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Wed, Oct 16, 2013 at 10:03:32PM +0200, Alistair Crooks wrote:
> On Wed, Oct 16, 2013 at 03:31:43PM -0400, Christos Zoulas wrote:
> > Module Name:        src
> > Committed By:       christos
> > Date:               Wed Oct 16 19:31:43 UTC 2013
> > 
> > Modified Files:
> >     src/sys/sys: cdefs.h
> > 
> > Log Message:
> > introduce __USE(variable) that uses a variable to squash unused variable
> > warnings.
> > [...]
> >  
> > +#define __USE(a) ((void)(a))
> 
> I've long been using a macro like:
> 
> #define USE_ARG(x)     /*LINTED*/(void)&(x)
> 
> to get rid of unused arg warnings, after a conversation between dsl
> and others (I think) on one of our lists.

This can force a variable to be assigned a stack slot without good
reason.

Joerg