Re: "make test" fails with current HEAD

> Johannes Schindelin:
> > From my diff man page:
> > 
> > -- snip --
> > DIAGNOSTICS
> >        An  exit status of 0 means no differences were found, 1 means some 
> >        differences were found, and 2 means trouble.
> > -- snap --
> > 
> > The exit value 2 is ambiguous for at least one version of GNU diff.
> > 
> AFAIK, We have
> 0 - no difference
> 1 - produced a reasonable diff
> 1 - produced a bad diff because binary stuff starts
>     after 4096-or-whatever bytes and diff didn't notice
> 2 - didn't produce a diff -- binary files differ
> 2 - something else broke
> 
> Right now we simply don't consider the second -2- case, because we just
> successfully wrote the two files in question; there's not *that* much
> that can fail after that. The second -1- case is sufficiently rare too.
> 
> So I still think a "Just write a 'Binary files FOO and BAR differ' line
> if the exit status is 2" rule would at least fix the current bug with
> diff 2.8.7.