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Re: problem with macro expansion in GCC
- To: Dhanabal Ekambaram <Dhanabal at Zambeel dot com>
- Subject: Re: problem with macro expansion in GCC
- From: Alexandre Oliva <aoliva at redhat dot com>
- Date: 06 Feb 2001 18:35:11 -0200
- Cc: "'gcc-help at gcc dot gnu dot org'" <gcc-help at gcc dot gnu dot org>
- Organization: GCC Team, Red Hat
- References: <2B8089144916D411896D00D0B73C8353998780@exchange.zambeel.com>
On Feb 6, 2001, Dhanabal Ekambaram <Dhanabal@Zambeel.com> wrote:
> #define XXX(N) N.ptr
> XXX(y) gets transformed to " y.ptr" instead of "y.ptr".
That's to prevent unwanted token pasting, if XXX(y) happens to be
preceded by something that might be seem like the same token. This
would unlikely be the case for this particular macro, but how is the
preprocessor to know that?
In any case, the extra space shouldn't be a problem for you; the
compiler will simply discard it.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
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