On Fri, 25 Sep 2020, 21:50 Hans Boehm, <boehm@acm.org> wrote:
p0943 proposes a C++ header that behaves like the C one, but defines the C facilities in terms of std::atomic. So we own our stdatomic.h and WG14 owns theirs.

Yes, it has to be a C++ version of stdatomic.h anyway, not the C library's one.