Add 'remark' diagnostic type in clang

[Joerg Sonnenberger]

On Fri, Feb 28, 2014 at 02:52:55AM -0800, Chandler Carruth wrote:
> 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.

Please don't. It is a linker flag that has historically often been
passed without -Wl to gcc.

Joerg