Re: autoconf-2.73 and gcc-14 and incomplete C23 support

    Unfortunately no compiler does that, as far as I know, and even if it 
    did it would be hard to test for it.

I'm not thinking of anything miraculous. Simply check if the resulting
__STDC_VERSION__ == 202311L. If not, don't use it.  Isn't this value
actually specified in the standard?

    To some extent this is a historical accident.

I understand the difference between C and C++ history and behavior. What
I don't understand is why it is desirable for Autoconf to forcibly, and
seemingly arbitrarily, prefer C23 over any other standard (and not doing
so for C++). It doesn't seem like Autoconf's business. -k