[Bug preprocessor/93677] Create a warning for duplicate macro definition

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93677

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-02-12
     Ever confirmed|0                           |1
           Severity|normal                      |enhancement