Add 'remark' diagnostic type in clang

[Chandler Carruth]

On Fri, Feb 28, 2014 at 2:10 AM, Dmitri Gribenko <gribozavr at gmail.com>wrote:

> On Fri, Feb 28, 2014 at 9:56 AM, Chandler Carruth <chandlerc at google.com>
> wrote:
> > I also think that it is ultimately a mistake to re-use the same
> commandline
> > syntax for remarks. While I'd rather re-use all the infrastructure, I'd
> > rather separate these into a different spelling eventually.
>
> +1.  Our current logic around -W* flags is already complex enough (to
> understand -- both for users and developers, to extend and to
> maintain), and overloading the meaning of -W* for remarks will only
> make it even more complex, and possibly confusing as well (it is well
> established that -W* flags enable warnings).


Ya know, -R* flags don't appear to be in use in the GCC commandline at all.
I'm liking the idea of taking over that capital letter for remarks-related
flags more.
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