std=c2x is using some Gnu extensions

[Quuxplusone]

Bugzilla Link	PR52573
Status	NEW
Importance	P enhancement
Reported by	Fred J. Tydeman (tydeman@tybor.com)
Reported on	2021-11-21 08:02:38 -0800
Last modified on	2021-11-21 08:02:38 -0800
Version	12.0
Hardware	Other Linux
CC	blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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Using std=c2x is using gnu-folding-constant.  I believe c2x mode is supposed to
NOT use any gnu extensions.

The code in question is of the form:
  int vla[ (int)+0x4.0p0 ] = { 7 };

The message says a VLA was folded to a constant array.

This is on an ARM laptop computer running Fedora Linux 34.