[Bug c/78000] -Wimplicit-function-declaration inhibited with macro from system headers

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78000

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
No, that won't work, there are some fails.