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Subject: Re: More C type errors by default for GCC 14
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> Date: Wed, 10 May 2023 14:37:50 -0400
> From: "James K. Lowden" <jklowden@schemamania.org>
> Cc: Jonathan Wakely <jwakely.gcc@gmail.com>
> 
> On Tue, 9 May 2023 23:45:50 +0100
> Jonathan Wakely via Gcc <gcc@gcc.gnu.org> wrote:
> 
> > On Tue, 9 May 2023 at 23:38, Joel Sherrill wrote:
> > > We are currently using gcc 12 and specifying C11.  To experiment
> > > with these stricter warnings and slowly address them, would we need
> > > to build with a newer C version?
> > 
> > No, the proposed changes are to give errors (instead of warnings) for
> > rules introduced in C99. GCC is just two decades late in enforcing the
> > C99 rules properly!
> 
> This, it seems to me, is the crux of the question.  Code that does not
> conform to the standard should produce an error.

That's not what the standard says, and that's not how GCC behaves.
GCC has options to enforce the standard, but other than that, it
doesn't reject extensions and deviations from the standard.