Support for %d$c format specifier

[Paolo Bonzini]

> > see many wrappers that setup or extract the
> > environmental info such as the line number of
> > the source file, source file name itself, etc..

This should not be a problem.  I am willing to do improvements to
libsnprintfv to help it being integrated in GCC.

> > >The only tile missing to the 1.0 release is dynamic loading of custom
> > >specifiers.
> >
> > How is the tile coming?
>
> I don't know precisely what Paolo is referring to.  Paolo?  :-)

This meant dynamic loaded .so modules.  I don't find it particularly useful,
but Gary Vaughan did, maybe because he needed it in m4.  But now, 1.0 has
been released and does have this.

> Yeah, the library ought to get hacked to allow the float stuff to be
> compiled out.  As it stands, it does require libm, but it ought
> to be a simple configury thing to fix it.

Yes, patch gladly accepted (because I am going on vacation soon, not because
it is hard).

> 4.  It was written to be included with libiberty.

I don't remember what we decided on ANSIfication... IIRC we went on because
GCC was being ANSIfied.  I am a bit rusty (and bored) on libiberty, when
will it be ANSIfied at last???

Paolo