[Bug c/65455] typeof _Atomic fails

[jens.gustedt at inria dot fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65455

--- Comment #4 from Jens Gustedt <jens.gustedt at inria dot fr> ---
This is a surprising policy change that occurs a random point in time, namely
where _Atomic is introduced to the C language and in addition does that in a
very unituitive way. Why drop _Atomic, why keep the others.

Also it doesn't look very consistent to me: on one hand you claim that it is
necessary for the implementation of stdatomic.h, but that now uses __auto_type.
For __auto_type the drop of qualifiers comes quite naturally since the RHS is
evaluated anyhow.

So basically the drop of _Atomic qualifiers by __typeof__ is a historic
artefact that maybe has been needed in a short period of time for one internal
use case in  libatomic.

Please consider changing this to a more comprehensive behavior.