Issue #23644: Fix issues with C++ when compiling Python extensions
Disable completly pyatomic.h on C++, because <stdatomic.h> is not compatible with C++.
<pyatomic.h> is only needed by the optimized PyThreadState_GET() macro in
pystate.h. Instead, declare PyThreadState_GET() as an alias to
PyThreadState_Get(), as done for limited API.
diff --git a/Include/pystate.h b/Include/pystate.h
index 4992c22..8539b65 100644
--- a/Include/pystate.h
+++ b/Include/pystate.h
@@ -174,12 +174,16 @@
/* Variable and macro for in-line access to current thread state */
/* Assuming the current thread holds the GIL, this is the
- PyThreadState for the current thread. */
-#ifndef Py_LIMITED_API
+ PyThreadState for the current thread.
+
+ Issue #23644: pyatomic.h is incompatible with C++ (yet). Disable
+ PyThreadState_GET() optimization: declare it as an alias to
+ PyThreadState_Get(), as done for limited API. */
+#if !defined(Py_LIMITED_API) && !defined(__cplusplus)
PyAPI_DATA(_Py_atomic_address) _PyThreadState_Current;
#endif
-#if defined(Py_DEBUG) || defined(Py_LIMITED_API)
+#if defined(Py_DEBUG) || defined(Py_LIMITED_API) || defined(__cplusplus)
#define PyThreadState_GET() PyThreadState_Get()
#else
#define PyThreadState_GET() \