[alsa-devel] snd_ctl compiler warnings

[Takashi Iwai]

At Fri, 7 Nov 2008 10:32:22 +0000,
Alan Horstmann wrote:
> 
> On Friday 07 November 2008 09:58, you wrote:
> > At Fri, 7 Nov 2008 08:52:43 +0000,
> > Alan Horstmann wrote:
> > > The code I am working with at present includes unremarkable lines such
> > > as:
> > >
> > > 		snd_ctl_elem_value_t *line_in_vol;
> > > 		snd_ctl_elem_value_alloca(&line_in_vol);
> > >
> > > Building this with a cross compiler for arm based on gcc 4.2.1 gives this
> > >
> > > warning for the 2nd line:
> > > : warning: the address of 'line_in_vol' will always evaluate as 'true'
> > >
> > > but an older compiler on the desktop does not show this.  Would this
> > > warning be expected in these circumstances, or is the compiler being over
> > > zealous? Am I missing something or is there a straightforward way to
> > > avoid such warnings?  (Code runs OK).
> >
> > Try the later version of alsa-lib.
> > This should have been already fixed.
> 
> Thanks very much.  You presumably refer to:
> 
> http://
> git.alsa-project.org/?p=alsa-lib.git;a=commit;h=68e5771a6f7a2aae2dbd02a097719bcd25c6f307
> 
> Right now a rebuild of the working environment would be a bit tricky.  At the 
> next opportunity I'll see if we can apply that patch to alsa-lib (I think it 
> is 1.0.15 -based) and rebuild.  In the meantime the warnings are presumably 
> fairly harmless?

Yes.  It's just a noise and can be safely ignored.


Takashi