https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118403
--- Comment #5 from Stephen Hemminger <stephen at networkplumber dot org> ---
(In reply to Andrew Pinski from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > Using `{}` is the correct fix. The referenced part of the C standard here is
> > applying to struct and not unions.
>
> Oh the big reason is GCC switched to defaulting to C23.
>
> Can you attach the preprocessed source with the exact command line used?
A little difficult with meson build, let me see
