[Bug preprocessor/33907] Empty macro definitions not considered equal

[schwab at suse dot de]

------- Comment #3 from schwab at suse dot de  2007-10-26 13:55 -------
The difference is that it is a constraint.  You must diagnose it at least in
pedantic mode.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33907