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@haypo
For adding compatibility for atomics based on @Joshua.J.Cogliati change, I propose:
#ifndef Py_LIMITED_API
#ifndef Py_ATOMIC_H
#define Py_ATOMIC_H
#include "dynamic_annotations.h"
#include "pyconfig.h"
#if defined(HAVE_STD_ATOMIC)
#ifdef __cplusplus
#include <atomic>
#define _Atomic(T) atomic<T>
using namespace std;
#else
#include <stdatomic.h>
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* This is modeled after the atomics interface from C1x, according to
 * the draft at
 * http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1425.pdf.
 * Operations and types are named the same except with a _Py_ prefix
 * and have the same semantics.
 *
 * Beware, the implementations here are deep magic.
 */
#if defined(HAVE_STD_ATOMIC)
typedef enum _Py_memory_order {
 _Py_memory_order_relaxed = memory_order_relaxed,
 _Py_memory_order_acquire = memory_order_acquire,
 _Py_memory_order_release = memory_order_release,
 _Py_memory_order_acq_rel = memory_order_acq_rel,
 _Py_memory_order_seq_cst = memory_order_seq_cst
} _Py_memory_order;
typedef struct _Py_atomic_address {
 _Atomic (void) *_value;
} _Py_atomic_address;
typedef struct _Py_atomic_int {
 atomic_int _value;
} _Py_atomic_int;
... (rest same)