[m-rev.] for review: report an error for multiple modes of operation

[Zoltan Somogyi]

On Sun, 30 Aug 2015 17:26:38 +1000 (AEST), Julien Fischer <jfischer at opturion.com> wrote:
> That's the behaviour of most of the other compilers (and many other
> command line tools) on my machine with respect to the --version option
> (or its equivalent); in so far as users may have any expectations about
> what --version does in relation to other modes of operation it seemed
> best to meet them.

That is a good reason. I would add a comment to that effect, though.

Zoltan.