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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/91972] Bootstrap should use -Wmissing-declarations
Date: Tue, 05 May 2020 09:42:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91972

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Another reason to have -Wmissing-declarations is that otherwise mismatches =
of
unused functions are not caught until it's too late (mismatching definition=
 is
assumed to be an overload of the function declared in the header file).

For a recent example, see
https://gcc.gnu.org/pipermail/gcc-patches/2020-May/545129.html which was
necessary after a mismatch introduced in
https://gcc.gnu.org/pipermail/gcc-patches/2020-May/545114.html=