[3.12] gh-105059: Fix MSCV compiler warning on PyObject union (GH-107239) (#107248)

miss-islington · vstinner · web-flow · commit 9c31d9405027 · 2023-07-25T15:35:49.000Z
gh-105059: Fix MSCV compiler warning on PyObject union (GH-107239) Use pragma to ignore the MSCV compiler warning on the PyObject nameless union. (cherry picked from commit 1c8fe9b) Co-authored-by: Victor Stinner <vstinner@python.org>
diff --git a/Include/object.h b/Include/object.h
@@ -165,17 +165,28 @@ check by comparing the reference count field to the immortality reference count.
  */
 struct _object {
     _PyObject_HEAD_EXTRA
+
 #if (defined(__GNUC__) || defined(__clang__)) \
         && !(defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L)
     // On C99 and older, anonymous union is a GCC and clang extension
     __extension__
+#endif
+#ifdef _MSC_VER
+    // Ignore MSC warning C4201: "nonstandard extension used:
+    // nameless struct/union"
+    __pragma(warning(push))
+    __pragma(warning(disable: 4201))
 #endif
     union {
        Py_ssize_t ob_refcnt;
 #if SIZEOF_VOID_P > 4
        PY_UINT32_T ob_refcnt_split[2];
 #endif
     };
+#ifdef _MSC_VER
+    __pragma(warning(pop))
+#endif
+
     PyTypeObject *ob_type;
 };
 
