gcc-14: -Wimplicit-function-declaration was promoted to an error

[Jason Mancini via Gcc-help <gcc-help@xxxxxxxxxxx>]

Hello,

In gcc-13, an implicit function declaration was a warning. In gcc-14, it's an error.
Both are the same __STDC_VERSION__ and no behavior change is mentioned in release_notes.

Was this intentional?

Thanks!
-Jason