Re: [sr #111072] "[[]] attributes are a C23 extension warning" with clang

[Paul Eggert]

On 2024-06-08 13:31, Paul J. Lucas wrote:
> > It looks like -Wc23-extensions is the problem. If you stop using it (or if you 
> > also use -std=gnu23), you shouldn't get those warnings. At least, that's the 
> > behavior I see with clang 18.1.6 (a bit later than your clang) on Fedora.
> I’m not using that option.  The options I am using are:
> ...
> -Wpedantic

-Wpedantic implies -Wc23-extensions, so omit -Wpedantic. Alternatively 
you can add -std=gnu23.

In practice -Wpedantic is more trouble than it's worth, and is best 
avoided. Adding -std=gnu23 can be a win, though, which is why the next 
Autoconf release is planned to default to that for C compilations.