Re: PR cpp/7263 pragma system_header doesn't suppress warning on LL or ULL constants

[Chris Lattner <clattner at apple dot com>]

On Aug 14, 2008, at 2:40 AM, Manuel López-Ibáñez wrote:

> 2008/8/13 Tom Tromey <tromey@redhat.com>:
> > Failing implementation of the full dream perhaps we can keep just two
> > locations -- one for the start of the top-level macro expansion and
> > one for the original location of the token.  This information is
> > already available to libcpp users -- just not really inside libcpp
> > itself.  This is a bizarre consequence of a hack needed to get mapped
> > locations working well enough to enable.
>
> I think that two locations would be enough for 99% of our purposes.
> AFAIK, that is what clang does (Chris?). They encode two locations per
> location cookie.

Yep exactly.  The Clang design inherently depends on this location  
information being correct as well in the lexer and several other low- 
level pieces.

-Chris