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Build C and C++ extensions with /W4 on Windows#168

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Merged
vstinner merged 4 commits intopython:mainfromvstinner:win_warnings
Feb 12, 2026
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26 changes: 19 additions & 7 deletionspythoncapi_compat.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1569,6 +1569,11 @@ static inline int PyLong_IsZero(PyObject *obj)

// gh-124502 added PyUnicode_Equal() to Python 3.14.0a0
#if PY_VERSION_HEX < 0x030E00A0

#if PY_VERSION_HEX >= 0x030d0000 && !defined(PYPY_VERSION)
PyAPI_FUNC(int)_PyUnicode_Equal(PyObject *str1, PyObject *str2);
#endif

staticinlineintPyUnicode_Equal(PyObject *str1, PyObject *str2)
{
if (!PyUnicode_Check(str1)) {
Expand All@@ -1583,8 +1588,6 @@ static inline int PyUnicode_Equal(PyObject *str1, PyObject *str2)
}

#if PY_VERSION_HEX >= 0x030d0000 && !defined(PYPY_VERSION)
PyAPI_FUNC(int)_PyUnicode_Equal(PyObject *str1, PyObject *str2);

return_PyUnicode_Equal(str1, str2);
#elif PY_VERSION_HEX >= 0x03060000 && !defined(PYPY_VERSION)
return_PyUnicode_EQ(str1, str2);
Expand All@@ -1607,11 +1610,14 @@ static inline PyObject* PyBytes_Join(PyObject *sep, PyObject *iterable)


#if PY_VERSION_HEX < 0x030E00A0

#if PY_VERSION_HEX >= 0x03000000 && !defined(PYPY_VERSION)
PyAPI_FUNC(Py_hash_t)_Py_HashBytes(constvoid *src, Py_ssize_t len);
#endif

staticinline Py_hash_tPy_HashBuffer(constvoid *ptr, Py_ssize_t len)
{
#if PY_VERSION_HEX >= 0x03000000 && !defined(PYPY_VERSION)
PyAPI_FUNC(Py_hash_t)_Py_HashBytes(constvoid *src, Py_ssize_t len);

return_Py_HashBytes(ptr, len);
#else
Py_hash_t hash;
Expand DownExpand Up@@ -1948,11 +1954,14 @@ PyLongWriter_Finish(PyLongWriter *writer)

// gh-127350 added Py_fopen() and Py_fclose() to Python 3.14a4
#if PY_VERSION_HEX < 0x030E00A4

#if 0x030400A2 <= PY_VERSION_HEX && !defined(PYPY_VERSION)
PyAPI_FUNC(FILE*)_Py_fopen_obj(PyObject *path,constchar *mode);
#endif

staticinline FILE*Py_fopen(PyObject *path,constchar *mode)
{
#if 0x030400A2 <= PY_VERSION_HEX && !defined(PYPY_VERSION)
PyAPI_FUNC(FILE*)_Py_fopen_obj(PyObject *path,constchar *mode);

return_Py_fopen_obj(path, mode);
#else
FILE *f;
Expand DownExpand Up@@ -2664,6 +2673,10 @@ PyUnstable_Unicode_GET_CACHED_HASH(PyObject *op)
// to make objects immortal until 3.14 which has _Py_SetImmortal(). Since
// immortal objects are primarily needed for free-threading, this API is implemented
// for 3.14 using _Py_SetImmortal() and uses private macros on 3.13.
#if 0x030E0000 <= PY_VERSION_HEX
PyAPI_FUNC(void)_Py_SetImmortal(PyObject *op);
#endif

staticinlineint
PyUnstable_SetImmortal(PyObject *op)
{
Expand All@@ -2672,7 +2685,6 @@ PyUnstable_SetImmortal(PyObject *op)
return0;
}
#if 0x030E0000 <= PY_VERSION_HEX
PyAPI_FUNC(void)_Py_SetImmortal(PyObject *op);
_Py_SetImmortal(op);
#else
// Python 3.13 doesn't export _Py_SetImmortal() function
Expand Down
11 changes: 8 additions & 3 deletionstests/setup.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -32,9 +32,6 @@
'-Wall', '-Wextra',
# Extra warnings
'-Wconversion',
# /usr/lib64/pypy3.7/include/pyport.h:68:20: error: redefinition of typedef
# 'Py_hash_t' is a C11 feature
'-Wno-typedef-redefinition',
# Formatting checks
'-Wformat',
'-Wformat-nonliteral',
Expand All@@ -47,6 +44,14 @@
# Treat all compiler warnings as compiler errors
'/WX',
))
# Python 3.11 and older emits C4100 "unreferenced parameter" warnings
# on Py_UNUSED() parameters. Py_UNUSED() was modified in Python 3.12
# to support MSVC.
if sys.version_info >= (3, 12):
COMMON_FLAGS.extend((
# Display warnings level 1 to 4
'/W4',
))
CFLAGS = list(COMMON_FLAGS)
CXXFLAGS = list(COMMON_FLAGS)

Expand Down
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