[Bug preprocessor/9449] UCNs not recognized in identifiers (c++/c99)

[joseph at codesourcery dot com]

------- Additional Comments From joseph at codesourcery dot com  2005-09-15 23:37 -------
Subject: Re:  UCNs not recognized in identifiers
 (c++/c99)

On Thu, 15 Sep 2005, neil at daikokuya dot co dot uk wrote:

> >   Yes, "spelling" is meant in terms of the source code characters.
> >   The idea is to permit simple strcmp-like checking by the preprocessor.
> 
> I think this is what we will need to do to fix the # and ## and spacing
> bugs in macro replacements too - base the decision upon a memcmp or
> strcmp.

Note that comparing macros replacements by strings means you can no longer 
fake a version of UCN model C (don't really rewrite UCNs in phase 1 but 
convert identifier spellings to UTF-8 on lexing identifiers) as now, 
because then the conversion to canonical form would be visible in the 
results of stringising them but differently spelt macro definitions would 
still show up as different.  You'd need either to convert identifiers 
before producing the string form of macro replacements, or (my preference) 
work out how to preserve different spellings of preprocessing tokens 
representing the same identifier (so as to get the results of stringising 
right).  (Comparing with strings may still be useful in order to fix the 
other bugs you mention.)



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9449