gh-157354: Recognize disabled sanitizer configure options in tests

Author: lpyu001

Lib/test/support/__init__.py

@@ -11,6 +11,7 @@
 import _opcode
 import os
 import re
+import shlex
 import stat
 import sys
 import sysconfig
@@ -469,27 +470,39 @@ def check_sanitizer(*, address=False, hwaddress=False, memory=False, ub=False,
 
 
     cflags = sysconfig.get_config_var('CFLAGS') or ''
-    config_args = sysconfig.get_config_var('CONFIG_ARGS') or ''
+    config_args = shlex.split(sysconfig.get_config_var('CONFIG_ARGS') or '')
+
+    def configured_with_sanitizer(name):
+        with_option = f'--with-{name}-sanitizer'
+        without_option = f'--without-{name}-sanitizer'
+        enabled = False
+        for arg in config_args:
+            if arg == without_option or arg == f'{with_option}=no':
+                enabled = False
+            elif arg == with_option or arg.startswith(f'{with_option}='):
+                enabled = True
+        return enabled
+
     memory_sanitizer = (
         '-fsanitize=memory' in cflags or
-        '--with-memory-sanitizer' in config_args
+        configured_with_sanitizer('memory')
     )
     hwaddress_sanitizer = (
         '-fsanitize=hwaddress' in cflags or
-        '--with-hwaddress-sanitizer' in config_args
+        configured_with_sanitizer('hwaddress')
     )
     address_sanitizer = (
         '-fsanitize=address' in cflags or
-        '--with-address-sanitizer' in config_args or
+        configured_with_sanitizer('address') or
         hwaddress_sanitizer
     )
     ub_sanitizer = (
         '-fsanitize=undefined' in cflags or
-        '--with-undefined-behavior-sanitizer' in config_args
+        configured_with_sanitizer('undefined-behavior')
     )
     thread_sanitizer = (
         '-fsanitize=thread' in cflags or
-        '--with-thread-sanitizer' in config_args
+        configured_with_sanitizer('thread')
     )
     function_sanitizer = (
         '-fsanitize=function' in cflags

Lib/test/test_support.py

@@ -17,6 +17,7 @@
 import textwrap
 import unittest
 import warnings
+from unittest import mock
 
 from test import support
 from test.support import isolation
@@ -60,6 +61,29 @@ def _caplog():
 
 
 class TestSupport(unittest.TestCase):
+    def test_check_sanitizer_config_args(self):
+        sanitizers = (
+            ('address', 'address'),
+            ('hwaddress', 'hwaddress'),
+            ('memory', 'memory'),
+            ('undefined-behavior', 'ub'),
+            ('thread', 'thread'),
+        )
+        for option, keyword in sanitizers:
+            for config_arg, expected in (
+                (f'--with-{option}-sanitizer=no', False),
+                (f'--without-{option}-sanitizer', False),
+                (f'--with-{option}-sanitizer', True),
+                (f'--with-{option}-sanitizer=yes', True),
+            ):
+                with self.subTest(config_arg=config_arg):
+                    config = {'CFLAGS': '', 'CONFIG_ARGS': f"'{config_arg}'"}
+                    with mock.patch.object(sysconfig, 'get_config_var',
+                                           side_effect=config.get):
+                        self.assertEqual(
+                            support.check_sanitizer(**{keyword: True}), expected
+                        )
+
     @classmethod
     def setUpClass(cls):
         orig_filter_len = len(warnings._get_filters())

Misc/NEWS.d/next/Build/2026-09-12-15-33-26.gh-issue-157354.2hw6fe.rst

@@ -1,4 +1,3 @@
 Honor ``=no`` and ``--without-...`` for the AddressSanitizer,
 HWAddressSanitizer, MemorySanitizer, UndefinedBehaviorSanitizer, and
-ThreadSanitizer configure options without adding sanitizer flags or changing
-the pymalloc setting.
+ThreadSanitizer configure options without adding sanitizer flags.