[Bug c++/60932] make stdatomic.h compatible with C++

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60932

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Patrick Pelissier from comment #12)
> Is the status really "wontfix"?
> 
> This makes any C library which uses stdatomic.h incompatible with g++ (and

<stdatomic.h> is not part of the C++ standard.

> more and more C code uses stdatomic.h) which is rather bothersome. clang
> doesn't have this issue.

Clang allows the C keyword _Atomic in C++. That's not part of the C++ standard
either

> What prevent stdatomic.h to detect if it is included in C++ mode and
> includes C++ <atomic> instead?

Even if it did that, it wouldn't guarantee that C's atomic_int and C++'s
std::atomic_int are compatible. So you'd still need to rely on non-portable
implementation-specific assumptions.