gh-91320: Use _PyCFunction_CAST() (#92251)

Replace "(PyCFunction)(void(*)(void))func" cast with
_PyCFunction_CAST(func).

Change generated by the command:

sed -i -e \
  's!(PyCFunction)(void(\*)(void)) *\([A-Za-z0-9_]\+\)!_PyCFunction_CAST(\1)!g' \
  $(find -name "*.c")

Modules/_asynciomodule.c

@@ -1724,7 +1724,7 @@ FutureIter_traverse(futureiterobject *it, visitproc visit, void *arg)
 
 static PyMethodDef FutureIter_methods[] = {
     {"send",  (PyCFunction)FutureIter_send, METH_O, NULL},
-    {"throw", (PyCFunction)(void(*)(void))FutureIter_throw, METH_FASTCALL, NULL},
+    {"throw", _PyCFunction_CAST(FutureIter_throw), METH_FASTCALL, NULL},
     {"close", (PyCFunction)FutureIter_close, METH_NOARGS, NULL},
     {NULL, NULL}        /* Sentinel */
 };

Modules/_collectionsmodule.c

@@ -1588,9 +1588,9 @@ static PyMethodDef deque_methods[] = {
         METH_O,                  extend_doc},
     {"extendleft",              (PyCFunction)deque_extendleft,
         METH_O,                  extendleft_doc},
-    {"index",                   (PyCFunction)(void(*)(void))deque_index,
+    {"index",                   _PyCFunction_CAST(deque_index),
         METH_FASTCALL,            index_doc},
-    {"insert",                  (PyCFunction)(void(*)(void))deque_insert,
+    {"insert",                  _PyCFunction_CAST(deque_insert),
         METH_FASTCALL,            insert_doc},
     {"pop",                     (PyCFunction)deque_pop,
         METH_NOARGS,             pop_doc},
@@ -1604,7 +1604,7 @@ static PyMethodDef deque_methods[] = {
         METH_NOARGS,             reversed_doc},
     {"reverse",                 (PyCFunction)deque_reverse,
         METH_NOARGS,             reverse_doc},
-    {"rotate",                  (PyCFunction)(void(*)(void))deque_rotate,
+    {"rotate",                  _PyCFunction_CAST(deque_rotate),
         METH_FASTCALL,            rotate_doc},
     {"__sizeof__",              (PyCFunction)deque_sizeof,
         METH_NOARGS,             sizeof_doc},

Modules/_csv.c

@@ -1704,11 +1704,11 @@ PyDoc_STRVAR(csv_register_dialect_doc,
 "    dialect = csv.register_dialect(name[, dialect[, **fmtparams]])");
 
 static struct PyMethodDef csv_methods[] = {
-    { "reader", (PyCFunction)(void(*)(void))csv_reader,
+    { "reader", _PyCFunction_CAST(csv_reader),
         METH_VARARGS | METH_KEYWORDS, csv_reader_doc},
-    { "writer", (PyCFunction)(void(*)(void))csv_writer,
+    { "writer", _PyCFunction_CAST(csv_writer),
         METH_VARARGS | METH_KEYWORDS, csv_writer_doc},
-    { "register_dialect", (PyCFunction)(void(*)(void))csv_register_dialect,
+    { "register_dialect", _PyCFunction_CAST(csv_register_dialect),
         METH_VARARGS | METH_KEYWORDS, csv_register_dialect_doc},
     _CSV_LIST_DIALECTS_METHODDEF
     _CSV_UNREGISTER_DIALECT_METHODDEF

Modules/_datetimemodule.c

@@ -3491,7 +3491,7 @@ static PyMethodDef date_methods[] = {
                                                          METH_CLASS,
       PyDoc_STR("str -> Construct a date from the output of date.isoformat()")},
 
-     {"fromisocalendar", (PyCFunction)(void(*)(void))date_fromisocalendar,
+     {"fromisocalendar", _PyCFunction_CAST(date_fromisocalendar),
       METH_VARARGS | METH_KEYWORDS | METH_CLASS,
       PyDoc_STR("int, int, int -> Construct a date from the ISO year, week "
                 "number and weekday.\n\n"
@@ -3506,7 +3506,7 @@ static PyMethodDef date_methods[] = {
     {"ctime",       (PyCFunction)date_ctime,        METH_NOARGS,
      PyDoc_STR("Return ctime() style string.")},
 
-    {"strftime",        (PyCFunction)(void(*)(void))date_strftime,     METH_VARARGS | METH_KEYWORDS,
+    {"strftime",        _PyCFunction_CAST(date_strftime),     METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("format -> strftime() style string.")},
 
     {"__format__",      (PyCFunction)date_format,       METH_VARARGS,
@@ -3534,7 +3534,7 @@ static PyMethodDef date_methods[] = {
      PyDoc_STR("Return the day of the week represented by the date.\n"
                "Monday == 0 ... Sunday == 6")},
 
-    {"replace",     (PyCFunction)(void(*)(void))date_replace,      METH_VARARGS | METH_KEYWORDS,
+    {"replace",     _PyCFunction_CAST(date_replace),      METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return date with new specified fields.")},
 
     {"__reduce__", (PyCFunction)date_reduce,        METH_NOARGS,
@@ -4644,15 +4644,15 @@ time_reduce(PyDateTime_Time *self, PyObject *arg)
 
 static PyMethodDef time_methods[] = {
 
-    {"isoformat",   (PyCFunction)(void(*)(void))time_isoformat,        METH_VARARGS | METH_KEYWORDS,
+    {"isoformat",   _PyCFunction_CAST(time_isoformat),        METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return string in ISO 8601 format, [HH[:MM[:SS[.mmm[uuu]]]]]"
                "[+HH:MM].\n\n"
                "The optional argument timespec specifies the number "
                "of additional terms\nof the time to include. Valid "
                "options are 'auto', 'hours', 'minutes',\n'seconds', "
                "'milliseconds' and 'microseconds'.\n")},
 
-    {"strftime",        (PyCFunction)(void(*)(void))time_strftime,     METH_VARARGS | METH_KEYWORDS,
+    {"strftime",        _PyCFunction_CAST(time_strftime),     METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("format -> strftime() style string.")},
 
     {"__format__",      (PyCFunction)date_format,       METH_VARARGS,
@@ -4667,7 +4667,7 @@ static PyMethodDef time_methods[] = {
     {"dst",             (PyCFunction)time_dst,          METH_NOARGS,
      PyDoc_STR("Return self.tzinfo.dst(self).")},
 
-    {"replace",     (PyCFunction)(void(*)(void))time_replace,          METH_VARARGS | METH_KEYWORDS,
+    {"replace",     _PyCFunction_CAST(time_replace),          METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return time with new specified fields.")},
 
      {"fromisoformat", (PyCFunction)time_fromisoformat, METH_O | METH_CLASS,
@@ -6308,7 +6308,7 @@ static PyMethodDef datetime_methods[] = {
      METH_NOARGS | METH_CLASS,
      PyDoc_STR("Return a new datetime representing UTC day and time.")},
 
-    {"fromtimestamp", (PyCFunction)(void(*)(void))datetime_fromtimestamp,
+    {"fromtimestamp", _PyCFunction_CAST(datetime_fromtimestamp),
      METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("timestamp[, tz] -> tz's local time from POSIX timestamp.")},
 
@@ -6321,7 +6321,7 @@ static PyMethodDef datetime_methods[] = {
      PyDoc_STR("string, format -> new datetime parsed from a string "
                "(like time.strptime()).")},
 
-    {"combine", (PyCFunction)(void(*)(void))datetime_combine,
+    {"combine", _PyCFunction_CAST(datetime_combine),
      METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("date, time -> datetime with same date and time fields")},
 
@@ -6352,7 +6352,7 @@ static PyMethodDef datetime_methods[] = {
     {"utctimetuple",   (PyCFunction)datetime_utctimetuple, METH_NOARGS,
      PyDoc_STR("Return UTC time tuple, compatible with time.localtime().")},
 
-    {"isoformat",   (PyCFunction)(void(*)(void))datetime_isoformat, METH_VARARGS | METH_KEYWORDS,
+    {"isoformat",   _PyCFunction_CAST(datetime_isoformat), METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("[sep] -> string in ISO 8601 format, "
                "YYYY-MM-DDT[HH[:MM[:SS[.mmm[uuu]]]]][+HH:MM].\n"
                "sep is used to separate the year from the time, and "
@@ -6371,10 +6371,10 @@ static PyMethodDef datetime_methods[] = {
     {"dst",             (PyCFunction)datetime_dst, METH_NOARGS,
      PyDoc_STR("Return self.tzinfo.dst(self).")},
 
-    {"replace",     (PyCFunction)(void(*)(void))datetime_replace,      METH_VARARGS | METH_KEYWORDS,
+    {"replace",     _PyCFunction_CAST(datetime_replace),      METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return datetime with new specified fields.")},
 
-    {"astimezone",  (PyCFunction)(void(*)(void))datetime_astimezone, METH_VARARGS | METH_KEYWORDS,
+    {"astimezone",  _PyCFunction_CAST(datetime_astimezone), METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("tz -> convert to local time in new timezone tz\n")},
 
     {"__reduce_ex__", (PyCFunction)datetime_reduce_ex,     METH_VARARGS,

Modules/_decimal/_decimal.c

@@ -4904,30 +4904,30 @@ static PyNumberMethods dec_number_methods =
 static PyMethodDef dec_methods [] =
 {
   /* Unary arithmetic functions, optional context arg */
-  { "exp", (PyCFunction)(void(*)(void))dec_mpd_qexp, METH_VARARGS|METH_KEYWORDS, doc_exp },
-  { "ln", (PyCFunction)(void(*)(void))dec_mpd_qln, METH_VARARGS|METH_KEYWORDS, doc_ln },
-  { "log10", (PyCFunction)(void(*)(void))dec_mpd_qlog10, METH_VARARGS|METH_KEYWORDS, doc_log10 },
-  { "next_minus", (PyCFunction)(void(*)(void))dec_mpd_qnext_minus, METH_VARARGS|METH_KEYWORDS, doc_next_minus },
-  { "next_plus", (PyCFunction)(void(*)(void))dec_mpd_qnext_plus, METH_VARARGS|METH_KEYWORDS, doc_next_plus },
-  { "normalize", (PyCFunction)(void(*)(void))dec_mpd_qreduce, METH_VARARGS|METH_KEYWORDS, doc_normalize },
-  { "to_integral", (PyCFunction)(void(*)(void))PyDec_ToIntegralValue, METH_VARARGS|METH_KEYWORDS, doc_to_integral },
-  { "to_integral_exact", (PyCFunction)(void(*)(void))PyDec_ToIntegralExact, METH_VARARGS|METH_KEYWORDS, doc_to_integral_exact },
-  { "to_integral_value", (PyCFunction)(void(*)(void))PyDec_ToIntegralValue, METH_VARARGS|METH_KEYWORDS, doc_to_integral_value },
-  { "sqrt", (PyCFunction)(void(*)(void))dec_mpd_qsqrt, METH_VARARGS|METH_KEYWORDS, doc_sqrt },
+  { "exp", _PyCFunction_CAST(dec_mpd_qexp), METH_VARARGS|METH_KEYWORDS, doc_exp },
+  { "ln", _PyCFunction_CAST(dec_mpd_qln), METH_VARARGS|METH_KEYWORDS, doc_ln },
+  { "log10", _PyCFunction_CAST(dec_mpd_qlog10), METH_VARARGS|METH_KEYWORDS, doc_log10 },
+  { "next_minus", _PyCFunction_CAST(dec_mpd_qnext_minus), METH_VARARGS|METH_KEYWORDS, doc_next_minus },
+  { "next_plus", _PyCFunction_CAST(dec_mpd_qnext_plus), METH_VARARGS|METH_KEYWORDS, doc_next_plus },
+  { "normalize", _PyCFunction_CAST(dec_mpd_qreduce), METH_VARARGS|METH_KEYWORDS, doc_normalize },
+  { "to_integral", _PyCFunction_CAST(PyDec_ToIntegralValue), METH_VARARGS|METH_KEYWORDS, doc_to_integral },
+  { "to_integral_exact", _PyCFunction_CAST(PyDec_ToIntegralExact), METH_VARARGS|METH_KEYWORDS, doc_to_integral_exact },
+  { "to_integral_value", _PyCFunction_CAST(PyDec_ToIntegralValue), METH_VARARGS|METH_KEYWORDS, doc_to_integral_value },
+  { "sqrt", _PyCFunction_CAST(dec_mpd_qsqrt), METH_VARARGS|METH_KEYWORDS, doc_sqrt },
 
   /* Binary arithmetic functions, optional context arg */
-  { "compare", (PyCFunction)(void(*)(void))dec_mpd_qcompare, METH_VARARGS|METH_KEYWORDS, doc_compare },
-  { "compare_signal", (PyCFunction)(void(*)(void))dec_mpd_qcompare_signal, METH_VARARGS|METH_KEYWORDS, doc_compare_signal },
-  { "max", (PyCFunction)(void(*)(void))dec_mpd_qmax, METH_VARARGS|METH_KEYWORDS, doc_max },
-  { "max_mag", (PyCFunction)(void(*)(void))dec_mpd_qmax_mag, METH_VARARGS|METH_KEYWORDS, doc_max_mag },
-  { "min", (PyCFunction)(void(*)(void))dec_mpd_qmin, METH_VARARGS|METH_KEYWORDS, doc_min },
-  { "min_mag", (PyCFunction)(void(*)(void))dec_mpd_qmin_mag, METH_VARARGS|METH_KEYWORDS, doc_min_mag },
-  { "next_toward", (PyCFunction)(void(*)(void))dec_mpd_qnext_toward, METH_VARARGS|METH_KEYWORDS, doc_next_toward },
-  { "quantize", (PyCFunction)(void(*)(void))dec_mpd_qquantize, METH_VARARGS|METH_KEYWORDS, doc_quantize },
-  { "remainder_near", (PyCFunction)(void(*)(void))dec_mpd_qrem_near, METH_VARARGS|METH_KEYWORDS, doc_remainder_near },
+  { "compare", _PyCFunction_CAST(dec_mpd_qcompare), METH_VARARGS|METH_KEYWORDS, doc_compare },
+  { "compare_signal", _PyCFunction_CAST(dec_mpd_qcompare_signal), METH_VARARGS|METH_KEYWORDS, doc_compare_signal },
+  { "max", _PyCFunction_CAST(dec_mpd_qmax), METH_VARARGS|METH_KEYWORDS, doc_max },
+  { "max_mag", _PyCFunction_CAST(dec_mpd_qmax_mag), METH_VARARGS|METH_KEYWORDS, doc_max_mag },
+  { "min", _PyCFunction_CAST(dec_mpd_qmin), METH_VARARGS|METH_KEYWORDS, doc_min },
+  { "min_mag", _PyCFunction_CAST(dec_mpd_qmin_mag), METH_VARARGS|METH_KEYWORDS, doc_min_mag },
+  { "next_toward", _PyCFunction_CAST(dec_mpd_qnext_toward), METH_VARARGS|METH_KEYWORDS, doc_next_toward },
+  { "quantize", _PyCFunction_CAST(dec_mpd_qquantize), METH_VARARGS|METH_KEYWORDS, doc_quantize },
+  { "remainder_near", _PyCFunction_CAST(dec_mpd_qrem_near), METH_VARARGS|METH_KEYWORDS, doc_remainder_near },
 
   /* Ternary arithmetic functions, optional context arg */
-  { "fma", (PyCFunction)(void(*)(void))dec_mpd_qfma, METH_VARARGS|METH_KEYWORDS, doc_fma },
+  { "fma", _PyCFunction_CAST(dec_mpd_qfma), METH_VARARGS|METH_KEYWORDS, doc_fma },
 
   /* Boolean functions, no context arg */
   { "is_canonical", dec_mpd_iscanonical, METH_NOARGS, doc_is_canonical },
@@ -4940,8 +4940,8 @@ static PyMethodDef dec_methods [] =
   { "is_zero", dec_mpd_iszero, METH_NOARGS, doc_is_zero },
 
   /* Boolean functions, optional context arg */
-  { "is_normal", (PyCFunction)(void(*)(void))dec_mpd_isnormal, METH_VARARGS|METH_KEYWORDS, doc_is_normal },
-  { "is_subnormal", (PyCFunction)(void(*)(void))dec_mpd_issubnormal, METH_VARARGS|METH_KEYWORDS, doc_is_subnormal },
+  { "is_normal", _PyCFunction_CAST(dec_mpd_isnormal), METH_VARARGS|METH_KEYWORDS, doc_is_normal },
+  { "is_subnormal", _PyCFunction_CAST(dec_mpd_issubnormal), METH_VARARGS|METH_KEYWORDS, doc_is_subnormal },
 
   /* Unary functions, no context arg */
   { "adjusted", dec_mpd_adjexp, METH_NOARGS, doc_adjusted },
@@ -4954,24 +4954,24 @@ static PyMethodDef dec_methods [] =
   { "copy_negate", dec_mpd_qcopy_negate, METH_NOARGS, doc_copy_negate },
 
   /* Unary functions, optional context arg */
-  { "logb", (PyCFunction)(void(*)(void))dec_mpd_qlogb, METH_VARARGS|METH_KEYWORDS, doc_logb },
-  { "logical_invert", (PyCFunction)(void(*)(void))dec_mpd_qinvert, METH_VARARGS|METH_KEYWORDS, doc_logical_invert },
-  { "number_class", (PyCFunction)(void(*)(void))dec_mpd_class, METH_VARARGS|METH_KEYWORDS, doc_number_class },
-  { "to_eng_string", (PyCFunction)(void(*)(void))dec_mpd_to_eng, METH_VARARGS|METH_KEYWORDS, doc_to_eng_string },
+  { "logb", _PyCFunction_CAST(dec_mpd_qlogb), METH_VARARGS|METH_KEYWORDS, doc_logb },
+  { "logical_invert", _PyCFunction_CAST(dec_mpd_qinvert), METH_VARARGS|METH_KEYWORDS, doc_logical_invert },
+  { "number_class", _PyCFunction_CAST(dec_mpd_class), METH_VARARGS|METH_KEYWORDS, doc_number_class },
+  { "to_eng_string", _PyCFunction_CAST(dec_mpd_to_eng), METH_VARARGS|METH_KEYWORDS, doc_to_eng_string },
 
   /* Binary functions, optional context arg for conversion errors */
-  { "compare_total", (PyCFunction)(void(*)(void))dec_mpd_compare_total, METH_VARARGS|METH_KEYWORDS, doc_compare_total },
-  { "compare_total_mag", (PyCFunction)(void(*)(void))dec_mpd_compare_total_mag, METH_VARARGS|METH_KEYWORDS, doc_compare_total_mag },
-  { "copy_sign", (PyCFunction)(void(*)(void))dec_mpd_qcopy_sign, METH_VARARGS|METH_KEYWORDS, doc_copy_sign },
-  { "same_quantum", (PyCFunction)(void(*)(void))dec_mpd_same_quantum, METH_VARARGS|METH_KEYWORDS, doc_same_quantum },
+  { "compare_total", _PyCFunction_CAST(dec_mpd_compare_total), METH_VARARGS|METH_KEYWORDS, doc_compare_total },
+  { "compare_total_mag", _PyCFunction_CAST(dec_mpd_compare_total_mag), METH_VARARGS|METH_KEYWORDS, doc_compare_total_mag },
+  { "copy_sign", _PyCFunction_CAST(dec_mpd_qcopy_sign), METH_VARARGS|METH_KEYWORDS, doc_copy_sign },
+  { "same_quantum", _PyCFunction_CAST(dec_mpd_same_quantum), METH_VARARGS|METH_KEYWORDS, doc_same_quantum },
 
   /* Binary functions, optional context arg */
-  { "logical_and", (PyCFunction)(void(*)(void))dec_mpd_qand, METH_VARARGS|METH_KEYWORDS, doc_logical_and },
-  { "logical_or", (PyCFunction)(void(*)(void))dec_mpd_qor, METH_VARARGS|METH_KEYWORDS, doc_logical_or },
-  { "logical_xor", (PyCFunction)(void(*)(void))dec_mpd_qxor, METH_VARARGS|METH_KEYWORDS, doc_logical_xor },
-  { "rotate", (PyCFunction)(void(*)(void))dec_mpd_qrotate, METH_VARARGS|METH_KEYWORDS, doc_rotate },
-  { "scaleb", (PyCFunction)(void(*)(void))dec_mpd_qscaleb, METH_VARARGS|METH_KEYWORDS, doc_scaleb },
-  { "shift", (PyCFunction)(void(*)(void))dec_mpd_qshift, METH_VARARGS|METH_KEYWORDS, doc_shift },
+  { "logical_and", _PyCFunction_CAST(dec_mpd_qand), METH_VARARGS|METH_KEYWORDS, doc_logical_and },
+  { "logical_or", _PyCFunction_CAST(dec_mpd_qor), METH_VARARGS|METH_KEYWORDS, doc_logical_or },
+  { "logical_xor", _PyCFunction_CAST(dec_mpd_qxor), METH_VARARGS|METH_KEYWORDS, doc_logical_xor },
+  { "rotate", _PyCFunction_CAST(dec_mpd_qrotate), METH_VARARGS|METH_KEYWORDS, doc_rotate },
+  { "scaleb", _PyCFunction_CAST(dec_mpd_qscaleb), METH_VARARGS|METH_KEYWORDS, doc_scaleb },
+  { "shift", _PyCFunction_CAST(dec_mpd_qshift), METH_VARARGS|METH_KEYWORDS, doc_shift },
 
   /* Miscellaneous */
   { "from_float", dec_from_float, METH_O|METH_CLASS, doc_from_float },
@@ -5609,7 +5609,7 @@ static PyMethodDef context_methods [] =
   { "subtract", ctx_mpd_qsub, METH_VARARGS, doc_ctx_subtract },
 
   /* Binary or ternary arithmetic functions */
-  { "power", (PyCFunction)(void(*)(void))ctx_mpd_qpow, METH_VARARGS|METH_KEYWORDS, doc_ctx_power },
+  { "power", _PyCFunction_CAST(ctx_mpd_qpow), METH_VARARGS|METH_KEYWORDS, doc_ctx_power },
 
   /* Ternary arithmetic functions */
   { "fma", ctx_mpd_qfma, METH_VARARGS, doc_ctx_fma },
@@ -5727,7 +5727,7 @@ static PyMethodDef _decimal_methods [] =
 {
   { "getcontext", (PyCFunction)PyDec_GetCurrentContext, METH_NOARGS, doc_getcontext},
   { "setcontext", (PyCFunction)PyDec_SetCurrentContext, METH_O, doc_setcontext},
-  { "localcontext", (PyCFunction)(void(*)(void))ctxmanager_new, METH_VARARGS|METH_KEYWORDS, doc_localcontext},
+  { "localcontext", _PyCFunction_CAST(ctxmanager_new), METH_VARARGS|METH_KEYWORDS, doc_localcontext},
 #ifdef EXTRA_FUNCTIONALITY
   { "IEEEContext", (PyCFunction)ieee_context, METH_O, doc_ieee_context},
 #endif

Modules/_elementtree.c

@@ -4349,7 +4349,7 @@ static PyTypeObject XMLParser_Type = {
 /* python module interface */
 
 static PyMethodDef _functions[] = {
-    {"SubElement", (PyCFunction)(void(*)(void)) subelement, METH_VARARGS | METH_KEYWORDS},
+    {"SubElement", _PyCFunction_CAST(subelement), METH_VARARGS | METH_KEYWORDS},
     _ELEMENTTREE__SET_FACTORIES_METHODDEF
     {NULL, NULL}
 };

Modules/_functoolsmodule.c

@@ -1432,7 +1432,7 @@ PyDoc_STRVAR(_functools_doc,
 
 static PyMethodDef _functools_methods[] = {
     {"reduce",          functools_reduce,     METH_VARARGS, functools_reduce_doc},
-    {"cmp_to_key",      (PyCFunction)(void(*)(void))functools_cmp_to_key,
+    {"cmp_to_key",      _PyCFunction_CAST(functools_cmp_to_key),
      METH_VARARGS | METH_KEYWORDS, functools_cmp_to_key_doc},
     {NULL,              NULL}           /* sentinel */
 };

Modules/_lsprof.c

@@ -787,7 +787,7 @@ profiler_init(ProfilerObject *pObj, PyObject *args, PyObject *kw)
 
 static PyMethodDef profiler_methods[] = {
     _LSPROF_PROFILER_GETSTATS_METHODDEF
-    {"enable",          (PyCFunction)(void(*)(void))profiler_enable,
+    {"enable",          _PyCFunction_CAST(profiler_enable),
                     METH_VARARGS | METH_KEYWORDS,       enable_doc},
     {"disable",         (PyCFunction)profiler_disable,
                     METH_NOARGS,                        disable_doc},

Modules/_operator.c

@@ -893,7 +893,7 @@ PyDoc_STRVAR(_operator_call__doc__,
 "Same as obj(*args, **kwargs).");
 
 #define _OPERATOR_CALL_METHODDEF    \
-    {"call", (PyCFunction)(void(*)(void))_operator_call, METH_FASTCALL | METH_KEYWORDS, _operator_call__doc__},
+    {"call", _PyCFunction_CAST(_operator_call), METH_FASTCALL | METH_KEYWORDS, _operator_call__doc__},
 
 static PyObject *
 _operator_call(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)

Modules/_struct.c

@@ -2049,8 +2049,8 @@ s_sizeof(PyStructObject *self, void *unused)
 
 static struct PyMethodDef s_methods[] = {
     STRUCT_ITER_UNPACK_METHODDEF
-    {"pack",            (PyCFunction)(void(*)(void))s_pack, METH_FASTCALL, s_pack__doc__},
-    {"pack_into",       (PyCFunction)(void(*)(void))s_pack_into, METH_FASTCALL, s_pack_into__doc__},
+    {"pack",            _PyCFunction_CAST(s_pack), METH_FASTCALL, s_pack__doc__},
+    {"pack_into",       _PyCFunction_CAST(s_pack_into), METH_FASTCALL, s_pack_into__doc__},
     STRUCT_UNPACK_METHODDEF
     STRUCT_UNPACK_FROM_METHODDEF
     {"__sizeof__",      (PyCFunction)s_sizeof, METH_NOARGS, s_sizeof__doc__},
@@ -2298,8 +2298,8 @@ static struct PyMethodDef module_functions[] = {
     _CLEARCACHE_METHODDEF
     CALCSIZE_METHODDEF
     ITER_UNPACK_METHODDEF
-    {"pack",            (PyCFunction)(void(*)(void))pack, METH_FASTCALL,   pack_doc},
-    {"pack_into",       (PyCFunction)(void(*)(void))pack_into, METH_FASTCALL,   pack_into_doc},
+    {"pack",            _PyCFunction_CAST(pack), METH_FASTCALL,   pack_doc},
+    {"pack_into",       _PyCFunction_CAST(pack_into), METH_FASTCALL,   pack_into_doc},
     UNPACK_METHODDEF
     UNPACK_FROM_METHODDEF
     {NULL,       NULL}          /* sentinel */