- Py_DECREF: Add `do { ... } while (0)' to avoid compiler warnings.

Include/object.h

@@ -749,11 +749,13 @@ PyAPI_FUNC(void) _Py_AddToAllObjects(PyObject *, int force);
 	((PyObject*)(op))->ob_refcnt++)
 
 #define Py_DECREF(op)					\
+	do {						\
 	    if (_Py_DEC_REFTOTAL  _Py_REF_DEBUG_COMMA	\
 		--((PyObject*)(op))->ob_refcnt != 0)	\
 		    _Py_CHECK_REFCNT(op)		\
 	    else					\
-		_Py_Dealloc((PyObject *)(op))
+		_Py_Dealloc((PyObject *)(op))		\
+        } while (0)
 
 /* Safely decref `op` and set `op` to NULL, especially useful in tp_clear
  * and tp_dealloc implementatons.

Misc/NEWS

@@ -207,6 +207,8 @@ Core and Builtins
 - Issue #3845: In PyRun_SimpleFileExFlags avoid invalid memory access with
   short file names.
 
+- Py_DECREF: Add `do { ... } while (0)' to avoid compiler warnings.
+
 Library
 -------