[Bug c/108295] Free label positions shouldn't be available outside -std=c2x

[daniel.lundin.mail at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108295

--- Comment #7 from Daniel Lundin <daniel.lundin.mail at gmail dot com> ---
(In reply to Andrew Pinski from comment #6)
> (In reply to Daniel Lundin from comment #5)
> > (In reply to Andrew Pinski from comment #4)
> > > Try -pedantic-errors.
> > 
> > Yes I already did and then the error appears. But that would imply that this
> > is a non-standard GNU extension and not an upcoming standard C23 feature,
> > which still doesn't seem correct. 
> > 
> > If the intention was to add this as a GNU extension until formal release of
> > C23, then the use of such GNU extensions will behave inconsistently between
> > gcc <10.4 and gcc >11.0 when using the same compiler options. And I don't
> > think that's documented anywhere either.
> 
> https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Mixed-Labels-and-Declarations.
> html#Mixed-Labels-and-Declarations
> 
> Compared to
> https://gcc.gnu.org/onlinedocs/gcc-9.5.0/gcc/Mixed-Declarations.html#Mixed-
> Declarations
> 
> Is definitely documented.

Fair enough but GNU C mode is -std=gnu17 (the default setting), not -std=c17.