https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100125
Lewis Hyatt <lhyatt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |lhyatt at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
The reason it works without #undef is that cpp_finish() is called late by the
C++ frontend, after it has processed everything including pragmas. With #undef,
the warning is generated immediately by libcpp and so is subject to PR53431.
There is a patch waiting for review that will resolve it.
*** This bug has been marked as a duplicate of bug 53431 ***
