[3.13] GH-92897: schedule the check_home deprecation to 3.15 (GH-129102)

Doc/deprecations/pending-removal-in-3.15.rst

@@ -55,6 +55,11 @@ Pending Removal in Python 3.15
     This function is only useful for Jython support, has a confusing API,
     and is largely untested.
 
+* :mod:`sysconfig`:
+
+  * The ``check_home`` argument of :func:`sysconfig.is_python_build` has been
+    deprecated since Python 3.12.
+
 * :mod:`threading`:
 
   * :func:`~threading.RLock` will take no arguments in Python 3.15.

Lib/sysconfig/__init__.py

@@ -220,8 +220,15 @@ def _safe_realpath(path):
 def is_python_build(check_home=None):
     if check_home is not None:
         import warnings
-        warnings.warn("check_home argument is deprecated and ignored.",
-                      DeprecationWarning, stacklevel=2)
+        warnings.warn(
+            (
+                'The check_home argument of sysconfig.is_python_build is '
+                'deprecated and its value is ignored. '
+                'It will be removed in Python 3.15.'
+            ),
+            DeprecationWarning,
+            stacklevel=2,
+        )
     for fn in ("Setup", "Setup.local"):
         if os.path.isfile(os.path.join(_PROJECT_BASE, "Modules", fn)):
             return True

Lib/test/test_sysconfig.py

@@ -689,5 +689,38 @@ def test_parse_makefile(self):
         })
 
 
+class DeprecationTests(unittest.TestCase):
+    def deprecated(self, removal_version, deprecation_msg=None, error=Exception, error_msg=None):
+        if sys.version_info >= removal_version:
+            return self.assertRaises(error, msg=error_msg)
+        else:
+            return self.assertWarns(DeprecationWarning, msg=deprecation_msg)
+
+    def test_expand_makefile_vars(self):
+        with self.deprecated(
+            removal_version=(3, 16),
+            deprecation_msg=(
+                'sysconfig.expand_makefile_vars is deprecated and will be removed in '
+                'Python 3.16. Use sysconfig.get_paths(vars=...) instead.',
+            ),
+            error=AttributeError,
+            error_msg="module 'sysconfig' has no attribute 'expand_makefile_vars'",
+        ):
+            sysconfig.expand_makefile_vars('', {})
+
+    def test_is_python_build_check_home(self):
+        with self.deprecated(
+            removal_version=(3, 15),
+            deprecation_msg=(
+                'The check_home argument of sysconfig.is_python_build is '
+                'deprecated and its value is ignored. '
+                'It will be removed in Python 3.15.'
+            ),
+            error=TypeError,
+            error_msg="is_python_build() takes 0 positional arguments but 1 were given",
+        ):
+            sysconfig.is_python_build('foo')
+
+
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/Library/2025-01-20-20-59-26.gh-issue-92897.G0xH8o.rst

@@ -0,0 +1,2 @@
+Scheduled the deprecation of the ``check_home`` argument of
+:func:`sysconfig.is_python_build` to Python 3.15.