[Bug preprocessor/109994] Issue a diagnostic when a C++ file defines a macro that hides a keyword

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109994

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
*** Bug 113532 has been marked as a duplicate of this bug. ***