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

[Arsen Arsenović]

Hi,

Jason Mancini via Gcc-help <gcc-help@gcc.gnu.org> writes:

> 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?

Yes.  The behavior change is noted in the release page[1] ("C: Certain
warnings about are now errors, see Porting to GCC 14 for details."), and
an elaborated report of the changes is at
https://gcc.gnu.org/gcc-14/porting_to.html#warnings-as-errors

Note that the constructs in question haven't been valid in a while and
were accepted as an extension.

Hope that helps, happy hacking.

[1] https://gcc.gnu.org/gcc-14/changes.html
-- 
Arsen Arsenović
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