[Bug libstdc++/69388] Allow functexcept.cc definitions to be replaced

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69388

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It would also offer a better way for Firefox to do:
https://dxr.mozilla.org/mozilla-central/source/memory/mozalloc/throw_gcc.h