[Bug c++/71003] __extension__ silences pedwarn for "\e" in C but not in C++

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71003

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
The issue of __extension__ not working with the preprocessor came up again
here: https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575414.html