Fixing the warning about warning(""); was: Re: [PATCH] difftool.c: mark a file-local symbol with static

> On Tue, Jan 24, 2017 at 01:52:13PM -0800, Junio C Hamano wrote:
> 
> > > I dunno. As ugly as the "%s" thing is in the source, at least it
> > > doesn't change the output. Not that an extra space is the end of the
> > > world, but it seems like it's letting the problem escape from the
> > > source code.
> > >
> > > Do people still care about resolving this? -Wno-format-zero-length
> > > is in the DEVELOPER options. It wasn't clear to me if that was
> > > sufficient, or if we're going to get a bunch of reports from people
> > > that need to be directed to the right compiler options.
> > 
> > I view both as ugly, but probably "%s", "" is lessor of the two evils.
> > 
> > Perhaps
> > 
> > 	#define JUST_SHOW_EMPTY_LINE "%s", ""
> > 
> > 		...
> > 		warning(JUST_SHOW_EMPTY_LINE);
> >                 ...
> > 
> > or something silly like that?
> 
> Gross, but at least it's self documenting. :)
> 
> I guess a less horrible version of that is:
> 
>   static inline warning_blank_line(void)
>   {
> 	warning("%s", "");
>   }
> 
> We'd potentially need a matching one for error(), but at last it avoids
> macro trickery.