[Bug preprocessor/94753] -undef, c++20 and feature-test macros

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94753

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Last reconfirmed|                            |2020-04-25
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1