[RFC] __extension__ and warnings

[Neil Booth]

Neil Booth wrote:-

> > I'm now imagining turning the DT_* enumeration into a set of bitflags,
> > so that you could write e.g.
> > 
> >   diagnostic (DT_EXTENSION | DT_MANDATED | DT_WARNING, "...")
> > 
> > to achieve the effect of 'pedwarn but shut up under __extension__.'

I think you mean DL_ constants, like I'm using in cpplib?  It was meant
to stand for diagnostic level.

> I prefer this.  Fancy changing all error(), warning(), pedwarn(), ...,
> calls?  8-)

Roughly there are 1965 error(), 820 warning() and 330 pedwarn() calls;
this includes the _with variants.  Piece of cake 8-)

This is probably a good 3.4 project; it would be a great cleanup of our
diagnostics system.  Do you agree Gaby?

Neil.