[Bug bootstrap/91972] Bootstrap should use -Wmissing-declarations

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91972

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
To clarify, are we talking about adding it just in the gcc subdirectory, or any
other subdirectories as well?