From 2996a2bed39206505852f537ae4514c4977e196d Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 13 Dec 2024 16:04:08 +0100
Subject: [PATCH] [3.13] gh-127906: Backport test_cext changes from the main
 branch (#127923)

---
 Lib/test/test_cext/__init__.py |  2 ++
 Lib/test/test_cext/extension.c | 10 ++++++++--
 Lib/test/test_cext/setup.py    | 13 +++++++++++--
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/Lib/test/test_cext/__init__.py b/Lib/test/test_cext/__init__.py
index ec44b0ce1f8a56..54859f9ff7622d 100644
--- a/Lib/test/test_cext/__init__.py
+++ b/Lib/test/test_cext/__init__.py
@@ -86,6 +86,8 @@ def run_cmd(operation, cmd):
         cmd = [python_exe, '-X', 'dev',
                '-m', 'pip', 'install', '--no-build-isolation',
                os.path.abspath(pkg_dir)]
+        if support.verbose:
+            cmd.append('-v')
         run_cmd('Install', cmd)
 
         # Do a reference run. Until we test that running python
diff --git a/Lib/test/test_cext/extension.c b/Lib/test/test_cext/extension.c
index eb23dbe20353ba..b76abe1d74c628 100644
--- a/Lib/test/test_cext/extension.c
+++ b/Lib/test/test_cext/extension.c
@@ -37,7 +37,13 @@ static PyMethodDef _testcext_methods[] = {
 
 
 static int
-_testcext_exec(PyObject *module)
+_testcext_exec(
+#ifdef __STDC_VERSION__
+    PyObject *module
+#else
+    PyObject *Py_UNUSED(module)
+#endif
+    )
 {
 #ifdef __STDC_VERSION__
     if (PyModule_AddIntMacro(module, __STDC_VERSION__) < 0) {
@@ -53,7 +59,7 @@ _testcext_exec(PyObject *module)
 }
 
 static PyModuleDef_Slot _testcext_slots[] = {
-    {Py_mod_exec, _testcext_exec},
+    {Py_mod_exec, (void*)_testcext_exec},
     {0, NULL}
 };
 
diff --git a/Lib/test/test_cext/setup.py b/Lib/test/test_cext/setup.py
index ccad3fa62ad086..e97749b45ea6f3 100644
--- a/Lib/test/test_cext/setup.py
+++ b/Lib/test/test_cext/setup.py
@@ -11,12 +11,16 @@
 
 
 SOURCE = 'extension.c'
+
 if not support.MS_WINDOWS:
     # C compiler flags for GCC and clang
     CFLAGS = [
         # The purpose of test_cext extension is to check that building a C
         # extension using the Python C API does not emit C compiler warnings.
         '-Werror',
+
+        # gh-120593: Check the 'const' qualifier
+        '-Wcast-qual',
     ]
     if not support.Py_GIL_DISABLED:
         CFLAGS.append(
@@ -25,8 +29,13 @@
             '-Werror=declaration-after-statement',
         )
 else:
-    # Don't pass any compiler flag to MSVC
-    CFLAGS = []
+    # MSVC compiler flags
+    CFLAGS = [
+        # Display warnings level 1 to 4
+        '/W4',
+        # Treat all compiler warnings as compiler errors
+        '/WX',
+    ]
 
 
 def main():