gh-91325: Skip Stable ABI checks with Py_TRACE_REFS special build (GH-92046)

Skip Stable ABI checks with Py_TRACE_REFS special build

This build is not compatible with Py_LIMITED_API nor with
the stable ABI.

Author: encukou

Lib/test/test_stable_abi_ctypes.py

@@ -78,6 +78,10 @@
 [feature_macro.Py_REF_DEBUG]
     doc = 'when Python is compiled in debug mode (with Py_REF_DEBUG)'
     windows = 'maybe'
+[feature_macro.Py_TRACE_REFS]
+    # nb. This mode is not compatible with Stable ABI/Limited API.
+    doc = 'when Python is compiled with Py_TRACE_REFS'
+    windows = 'maybe'
 
 
 # Mentioned in PEP 384:

Misc/stable_abi.toml

@@ -38,6 +38,15 @@ if (res) {
     Py_DECREF(result); return NULL;
 }
 
+#ifdef Py_TRACE_REFS
+    res = PyDict_SetItemString(result, "Py_TRACE_REFS", Py_True);
+#else
+    res = PyDict_SetItemString(result, "Py_TRACE_REFS", Py_False);
+#endif
+if (res) {
+    Py_DECREF(result); return NULL;
+}
+
 #ifdef USE_STACKCHECK
     res = PyDict_SetItemString(result, "USE_STACKCHECK", Py_True);
 #else

Modules/_testcapi_feature_macros.inc

@@ -278,6 +278,13 @@ def gen_ctypes_test(manifest, args, outfile):
         from _testcapi import get_feature_macros
 
         feature_macros = get_feature_macros()
+
+        # Stable ABI is incompatible with Py_TRACE_REFS builds due to PyObject
+        # layout differences.
+        # See https://github.com/python/cpython/issues/88299#issuecomment-1113366226
+        if feature_macros['Py_TRACE_REFS']:
+            raise unittest.SkipTest("incompatible with Py_TRACE_REFS.")
+
         ctypes_test = import_module('ctypes')
 
         class TestStableABIAvailability(unittest.TestCase):
@@ -308,16 +315,11 @@ def test_windows_feature_macros(self):
         {'function', 'data'},
         include_abi_only=True,
     )
-    optional_items = {}
+    feature_macros = list(manifest.select({'feature_macro'}))
+    optional_items = {m.name: [] for m in feature_macros}
     for item in items:
-        if item.name in (
-                # Some symbols aren't exported on all platforms.
-                # This is a bug: https://bugs.python.org/issue44133
-                'PyModule_Create2', 'PyModule_FromDefAndSpec2',
-            ):
-            continue
         if item.ifdef:
-            optional_items.setdefault(item.ifdef, []).append(item.name)
+            optional_items[item.ifdef].append(item.name)
         else:
             write(f'    "{item.name}",')
     write(")")
@@ -328,7 +330,6 @@ def test_windows_feature_macros(self):
             write(f"        {name!r},")
         write("    )")
     write("")
-    feature_macros = list(manifest.select({'feature_macro'}))
     feature_names = sorted(m.name for m in feature_macros)
     write(f"EXPECTED_FEATURE_MACROS = set({pprint.pformat(feature_names)})")