bpo-33012: Fix invalid function cast warnings with gcc 8. (GH-6749)

Fix invalid function cast warnings with gcc 8
for method conventions different from METH_NOARGS, METH_O and
METH_VARARGS excluding Argument Clinic generated code.

Author: serhiy-storchaka

Doc/extending/extending.rst

@@ -757,7 +757,7 @@ Philbrick (philbrick@hks.com)::
         * only take two PyObject* parameters, and keywdarg_parrot() takes
         * three.
         */
-       {"parrot", (PyCFunction)keywdarg_parrot, METH_VARARGS | METH_KEYWORDS,
+       {"parrot", (PyCFunction)(void(*)(void))keywdarg_parrot, METH_VARARGS | METH_KEYWORDS,
         "Print a lovely skit to standard output."},
        {NULL, NULL, 0, NULL}   /* sentinel */
    };

Modules/_bisectmodule.c

@@ -241,13 +241,13 @@ Optional args lo (default 0) and hi (default len(a)) bound the\n\
 slice of a to be searched.\n");
 
 static PyMethodDef bisect_methods[] = {
-    {"bisect_right", (PyCFunction)bisect_right,
+    {"bisect_right", (PyCFunction)(void(*)(void))bisect_right,
         METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
-    {"insort_right", (PyCFunction)insort_right,
+    {"insort_right", (PyCFunction)(void(*)(void))insort_right,
         METH_VARARGS|METH_KEYWORDS, insort_right_doc},
-    {"bisect_left", (PyCFunction)bisect_left,
+    {"bisect_left", (PyCFunction)(void(*)(void))bisect_left,
         METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
-    {"insort_left", (PyCFunction)insort_left,
+    {"insort_left", (PyCFunction)(void(*)(void))insort_left,
         METH_VARARGS|METH_KEYWORDS, insort_left_doc},
     {NULL, NULL} /* sentinel */
 };

Modules/_collectionsmodule.c

@@ -1573,9 +1573,9 @@ static PyMethodDef deque_methods[] = {
         METH_O,                  extend_doc},
     {"extendleft",              (PyCFunction)deque_extendleft,
         METH_O,                  extendleft_doc},
-    {"index",                   (PyCFunction)deque_index,
+    {"index",                   (PyCFunction)(void(*)(void))deque_index,
         METH_FASTCALL,            index_doc},
-    {"insert",                  (PyCFunction)deque_insert,
+    {"insert",                  (PyCFunction)(void(*)(void))deque_insert,
         METH_FASTCALL,            insert_doc},
     {"pop",                     (PyCFunction)deque_pop,
         METH_NOARGS,             pop_doc},
@@ -1589,7 +1589,7 @@ static PyMethodDef deque_methods[] = {
         METH_NOARGS,             reversed_doc},
     {"reverse",                 (PyCFunction)deque_reverse,
         METH_NOARGS,             reverse_doc},
-    {"rotate",                  (PyCFunction)deque_rotate,
+    {"rotate",                  (PyCFunction)(void(*)(void))deque_rotate,
         METH_FASTCALL,            rotate_doc},
     {"__sizeof__",              (PyCFunction)deque_sizeof,
         METH_NOARGS,             sizeof_doc},

Modules/_csv.c

@@ -1583,13 +1583,13 @@ PyDoc_STRVAR(csv_field_size_limit_doc,
 "the old limit is returned");
 
 static struct PyMethodDef csv_methods[] = {
-    { "reader", (PyCFunction)csv_reader,
+    { "reader", (PyCFunction)(void(*)(void))csv_reader,
         METH_VARARGS | METH_KEYWORDS, csv_reader_doc},
-    { "writer", (PyCFunction)csv_writer,
+    { "writer", (PyCFunction)(void(*)(void))csv_writer,
         METH_VARARGS | METH_KEYWORDS, csv_writer_doc},
     { "list_dialects", (PyCFunction)csv_list_dialects,
         METH_NOARGS, csv_list_dialects_doc},
-    { "register_dialect", (PyCFunction)csv_register_dialect,
+    { "register_dialect", (PyCFunction)(void(*)(void))csv_register_dialect,
         METH_VARARGS | METH_KEYWORDS, csv_register_dialect_doc},
     { "unregister_dialect", (PyCFunction)csv_unregister_dialect,
         METH_O, csv_unregister_dialect_doc},

Modules/_datetimemodule.c

@@ -3255,7 +3255,7 @@ static PyMethodDef date_methods[] = {
     {"ctime",       (PyCFunction)date_ctime,        METH_NOARGS,
      PyDoc_STR("Return ctime() style string.")},
 
-    {"strftime",        (PyCFunction)date_strftime,     METH_VARARGS | METH_KEYWORDS,
+    {"strftime",        (PyCFunction)(void(*)(void))date_strftime,     METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("format -> strftime() style string.")},
 
     {"__format__",      (PyCFunction)date_format,       METH_VARARGS,
@@ -3283,7 +3283,7 @@ static PyMethodDef date_methods[] = {
      PyDoc_STR("Return the day of the week represented by the date.\n"
                "Monday == 0 ... Sunday == 6")},
 
-    {"replace",     (PyCFunction)date_replace,      METH_VARARGS | METH_KEYWORDS,
+    {"replace",     (PyCFunction)(void(*)(void))date_replace,      METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return date with new specified fields.")},
 
     {"__reduce__", (PyCFunction)date_reduce,        METH_NOARGS,
@@ -4392,12 +4392,12 @@ time_reduce(PyDateTime_Time *self, PyObject *arg)
 
 static PyMethodDef time_methods[] = {
 
-    {"isoformat",   (PyCFunction)time_isoformat,        METH_VARARGS | METH_KEYWORDS,
+    {"isoformat",   (PyCFunction)(void(*)(void))time_isoformat,        METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return string in ISO 8601 format, [HH[:MM[:SS[.mmm[uuu]]]]]"
                "[+HH:MM].\n\n"
                "timespec specifies what components of the time to include.\n")},
 
-    {"strftime",        (PyCFunction)time_strftime,     METH_VARARGS | METH_KEYWORDS,
+    {"strftime",        (PyCFunction)(void(*)(void))time_strftime,     METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("format -> strftime() style string.")},
 
     {"__format__",      (PyCFunction)date_format,       METH_VARARGS,
@@ -4412,7 +4412,7 @@ static PyMethodDef time_methods[] = {
     {"dst",             (PyCFunction)time_dst,          METH_NOARGS,
      PyDoc_STR("Return self.tzinfo.dst(self).")},
 
-    {"replace",     (PyCFunction)time_replace,          METH_VARARGS | METH_KEYWORDS,
+    {"replace",     (PyCFunction)(void(*)(void))time_replace,          METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return time with new specified fields.")},
 
      {"fromisoformat", (PyCFunction)time_fromisoformat, METH_O | METH_CLASS,
@@ -6025,7 +6025,7 @@ static PyMethodDef datetime_methods[] = {
      METH_NOARGS | METH_CLASS,
      PyDoc_STR("Return a new datetime representing UTC day and time.")},
 
-    {"fromtimestamp", (PyCFunction)datetime_fromtimestamp,
+    {"fromtimestamp", (PyCFunction)(void(*)(void))datetime_fromtimestamp,
      METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("timestamp[, tz] -> tz's local time from POSIX timestamp.")},
 
@@ -6038,7 +6038,7 @@ static PyMethodDef datetime_methods[] = {
      PyDoc_STR("string, format -> new datetime parsed from a string "
                "(like time.strptime()).")},
 
-    {"combine", (PyCFunction)datetime_combine,
+    {"combine", (PyCFunction)(void(*)(void))datetime_combine,
      METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("date, time -> datetime with same date and time fields")},
 
@@ -6069,7 +6069,7 @@ static PyMethodDef datetime_methods[] = {
     {"utctimetuple",   (PyCFunction)datetime_utctimetuple, METH_NOARGS,
      PyDoc_STR("Return UTC time tuple, compatible with time.localtime().")},
 
-    {"isoformat",   (PyCFunction)datetime_isoformat, METH_VARARGS | METH_KEYWORDS,
+    {"isoformat",   (PyCFunction)(void(*)(void))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 "
@@ -6087,10 +6087,10 @@ static PyMethodDef datetime_methods[] = {
     {"dst",             (PyCFunction)datetime_dst, METH_NOARGS,
      PyDoc_STR("Return self.tzinfo.dst(self).")},
 
-    {"replace",     (PyCFunction)datetime_replace,      METH_VARARGS | METH_KEYWORDS,
+    {"replace",     (PyCFunction)(void(*)(void))datetime_replace,      METH_VARARGS | METH_KEYWORDS,
      PyDoc_STR("Return datetime with new specified fields.")},
 
-    {"astimezone",  (PyCFunction)datetime_astimezone, METH_VARARGS | METH_KEYWORDS,
+    {"astimezone",  (PyCFunction)(void(*)(void))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

@@ -4598,30 +4598,30 @@ static PyNumberMethods dec_number_methods =
 static PyMethodDef dec_methods [] =
 {
   /* Unary arithmetic functions, optional context arg */
-  { "exp", (PyCFunction)dec_mpd_qexp, METH_VARARGS|METH_KEYWORDS, doc_exp },
-  { "ln", (PyCFunction)dec_mpd_qln, METH_VARARGS|METH_KEYWORDS, doc_ln },
-  { "log10", (PyCFunction)dec_mpd_qlog10, METH_VARARGS|METH_KEYWORDS, doc_log10 },
-  { "next_minus", (PyCFunction)dec_mpd_qnext_minus, METH_VARARGS|METH_KEYWORDS, doc_next_minus },
-  { "next_plus", (PyCFunction)dec_mpd_qnext_plus, METH_VARARGS|METH_KEYWORDS, doc_next_plus },
-  { "normalize", (PyCFunction)dec_mpd_qreduce, METH_VARARGS|METH_KEYWORDS, doc_normalize },
-  { "to_integral", (PyCFunction)PyDec_ToIntegralValue, METH_VARARGS|METH_KEYWORDS, doc_to_integral },
-  { "to_integral_exact", (PyCFunction)PyDec_ToIntegralExact, METH_VARARGS|METH_KEYWORDS, doc_to_integral_exact },
-  { "to_integral_value", (PyCFunction)PyDec_ToIntegralValue, METH_VARARGS|METH_KEYWORDS, doc_to_integral_value },
-  { "sqrt", (PyCFunction)dec_mpd_qsqrt, METH_VARARGS|METH_KEYWORDS, doc_sqrt },
+  { "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 },
 
   /* Binary arithmetic functions, optional context arg */
-  { "compare", (PyCFunction)dec_mpd_qcompare, METH_VARARGS|METH_KEYWORDS, doc_compare },
-  { "compare_signal", (PyCFunction)dec_mpd_qcompare_signal, METH_VARARGS|METH_KEYWORDS, doc_compare_signal },
-  { "max", (PyCFunction)dec_mpd_qmax, METH_VARARGS|METH_KEYWORDS, doc_max },
-  { "max_mag", (PyCFunction)dec_mpd_qmax_mag, METH_VARARGS|METH_KEYWORDS, doc_max_mag },
-  { "min", (PyCFunction)dec_mpd_qmin, METH_VARARGS|METH_KEYWORDS, doc_min },
-  { "min_mag", (PyCFunction)dec_mpd_qmin_mag, METH_VARARGS|METH_KEYWORDS, doc_min_mag },
-  { "next_toward", (PyCFunction)dec_mpd_qnext_toward, METH_VARARGS|METH_KEYWORDS, doc_next_toward },
-  { "quantize", (PyCFunction)dec_mpd_qquantize, METH_VARARGS|METH_KEYWORDS, doc_quantize },
-  { "remainder_near", (PyCFunction)dec_mpd_qrem_near, METH_VARARGS|METH_KEYWORDS, doc_remainder_near },
+  { "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 },
 
   /* Ternary arithmetic functions, optional context arg */
-  { "fma", (PyCFunction)dec_mpd_qfma, METH_VARARGS|METH_KEYWORDS, doc_fma },
+  { "fma", (PyCFunction)(void(*)(void))dec_mpd_qfma, METH_VARARGS|METH_KEYWORDS, doc_fma },
 
   /* Boolean functions, no context arg */
   { "is_canonical", dec_mpd_iscanonical, METH_NOARGS, doc_is_canonical },
@@ -4634,8 +4634,8 @@ static PyMethodDef dec_methods [] =
   { "is_zero", dec_mpd_iszero, METH_NOARGS, doc_is_zero },
 
   /* Boolean functions, optional context arg */
-  { "is_normal", (PyCFunction)dec_mpd_isnormal, METH_VARARGS|METH_KEYWORDS, doc_is_normal },
-  { "is_subnormal", (PyCFunction)dec_mpd_issubnormal, METH_VARARGS|METH_KEYWORDS, doc_is_subnormal },
+  { "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 },
 
   /* Unary functions, no context arg */
   { "adjusted", dec_mpd_adjexp, METH_NOARGS, doc_adjusted },
@@ -4648,24 +4648,24 @@ static PyMethodDef dec_methods [] =
   { "copy_negate", dec_mpd_qcopy_negate, METH_NOARGS, doc_copy_negate },
 
   /* Unary functions, optional context arg */
-  { "logb", (PyCFunction)dec_mpd_qlogb, METH_VARARGS|METH_KEYWORDS, doc_logb },
-  { "logical_invert", (PyCFunction)dec_mpd_qinvert, METH_VARARGS|METH_KEYWORDS, doc_logical_invert },
-  { "number_class", (PyCFunction)dec_mpd_class, METH_VARARGS|METH_KEYWORDS, doc_number_class },
-  { "to_eng_string", (PyCFunction)dec_mpd_to_eng, METH_VARARGS|METH_KEYWORDS, doc_to_eng_string },
+  { "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 },
 
   /* Binary functions, optional context arg for conversion errors */
-  { "compare_total", (PyCFunction)dec_mpd_compare_total, METH_VARARGS|METH_KEYWORDS, doc_compare_total },
-  { "compare_total_mag", (PyCFunction)dec_mpd_compare_total_mag, METH_VARARGS|METH_KEYWORDS, doc_compare_total_mag },
-  { "copy_sign", (PyCFunction)dec_mpd_qcopy_sign, METH_VARARGS|METH_KEYWORDS, doc_copy_sign },
-  { "same_quantum", (PyCFunction)dec_mpd_same_quantum, METH_VARARGS|METH_KEYWORDS, doc_same_quantum },
+  { "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 },
 
   /* Binary functions, optional context arg */
-  { "logical_and", (PyCFunction)dec_mpd_qand, METH_VARARGS|METH_KEYWORDS, doc_logical_and },
-  { "logical_or", (PyCFunction)dec_mpd_qor, METH_VARARGS|METH_KEYWORDS, doc_logical_or },
-  { "logical_xor", (PyCFunction)dec_mpd_qxor, METH_VARARGS|METH_KEYWORDS, doc_logical_xor },
-  { "rotate", (PyCFunction)dec_mpd_qrotate, METH_VARARGS|METH_KEYWORDS, doc_rotate },
-  { "scaleb", (PyCFunction)dec_mpd_qscaleb, METH_VARARGS|METH_KEYWORDS, doc_scaleb },
-  { "shift", (PyCFunction)dec_mpd_qshift, METH_VARARGS|METH_KEYWORDS, doc_shift },
+  { "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 },
 
   /* Miscellaneous */
   { "from_float", dec_from_float, METH_O|METH_CLASS, doc_from_float },
@@ -5303,7 +5303,7 @@ static PyMethodDef context_methods [] =
   { "subtract", ctx_mpd_qsub, METH_VARARGS, doc_ctx_subtract },
 
   /* Binary or ternary arithmetic functions */
-  { "power", (PyCFunction)ctx_mpd_qpow, METH_VARARGS|METH_KEYWORDS, doc_ctx_power },
+  { "power", (PyCFunction)(void(*)(void))ctx_mpd_qpow, METH_VARARGS|METH_KEYWORDS, doc_ctx_power },
 
   /* Ternary arithmetic functions */
   { "fma", ctx_mpd_qfma, METH_VARARGS, doc_ctx_fma },
@@ -5421,7 +5421,7 @@ static PyMethodDef _decimal_methods [] =
 {
   { "getcontext", (PyCFunction)PyDec_GetCurrentContext, METH_NOARGS, doc_getcontext},
   { "setcontext", (PyCFunction)PyDec_SetCurrentContext, METH_O, doc_setcontext},
-  { "localcontext", (PyCFunction)ctxmanager_new, METH_VARARGS|METH_KEYWORDS, doc_localcontext},
+  { "localcontext", (PyCFunction)(void(*)(void))ctxmanager_new, METH_VARARGS|METH_KEYWORDS, doc_localcontext},
 #ifdef EXTRA_FUNCTIONALITY
   { "IEEEContext", (PyCFunction)ieee_context, METH_O, doc_ieee_context},
 #endif

Modules/_elementtree.c

@@ -3968,7 +3968,7 @@ static PyTypeObject XMLParser_Type = {
 /* python module interface */
 
 static PyMethodDef _functions[] = {
-    {"SubElement", (PyCFunction) subelement, METH_VARARGS | METH_KEYWORDS},
+    {"SubElement", (PyCFunction)(void(*)(void)) subelement, METH_VARARGS | METH_KEYWORDS},
     {NULL, NULL}
 };
 

Modules/_functoolsmodule.c

@@ -1236,7 +1236,7 @@ PyDoc_STRVAR(module_doc,
 
 static PyMethodDef module_methods[] = {
     {"reduce",          functools_reduce,     METH_VARARGS, functools_reduce_doc},
-    {"cmp_to_key",      (PyCFunction)functools_cmp_to_key,
+    {"cmp_to_key",      (PyCFunction)(void(*)(void))functools_cmp_to_key,
      METH_VARARGS | METH_KEYWORDS, functools_cmp_to_key_doc},
     {NULL,              NULL}           /* sentinel */
 };

Modules/_hashopenssl.c

@@ -1011,7 +1011,7 @@ generate_hash_name_list(void)
 
 /* a PyMethodDef structure for the constructor */
 #define CONSTRUCTOR_METH_DEF(NAME)  \
-    {"openssl_" #NAME, (PyCFunction)EVP_new_ ## NAME, METH_FASTCALL, \
+    {"openssl_" #NAME, (PyCFunction)(void(*)(void))EVP_new_ ## NAME, METH_FASTCALL, \
         PyDoc_STR("Returns a " #NAME \
                   " hash object; optionally initialized with a string") \
     }
@@ -1034,9 +1034,9 @@ GEN_CONSTRUCTOR(sha512)
 /* List of functions exported by this module */
 
 static struct PyMethodDef EVP_functions[] = {
-    {"new", (PyCFunction)EVP_new, METH_VARARGS|METH_KEYWORDS, EVP_new__doc__},
+    {"new", (PyCFunction)(void(*)(void))EVP_new, METH_VARARGS|METH_KEYWORDS, EVP_new__doc__},
 #ifdef PY_PBKDF2_HMAC
-    {"pbkdf2_hmac", (PyCFunction)pbkdf2_hmac, METH_VARARGS|METH_KEYWORDS,
+    {"pbkdf2_hmac", (PyCFunction)(void(*)(void))pbkdf2_hmac, METH_VARARGS|METH_KEYWORDS,
      pbkdf2_hmac__doc__},
 #endif
     _HASHLIB_SCRYPT_METHODDEF

Modules/_lsprof.c

@@ -778,7 +778,7 @@ profiler_init(ProfilerObject *pObj, PyObject *args, PyObject *kw)
 static PyMethodDef profiler_methods[] = {
     {"getstats",    (PyCFunction)profiler_getstats,
                     METH_NOARGS,                        getstats_doc},
-    {"enable",          (PyCFunction)profiler_enable,
+    {"enable",          (PyCFunction)(void(*)(void))profiler_enable,
                     METH_VARARGS | METH_KEYWORDS,       enable_doc},
     {"disable",         (PyCFunction)profiler_disable,
                     METH_NOARGS,                        disable_doc},

Modules/_multiprocessing/semaphore.c

@@ -581,11 +581,11 @@ semlock_afterfork(SemLockObject *self, PyObject *Py_UNUSED(ignored))
  */
 
 static PyMethodDef semlock_methods[] = {
-    {"acquire", (PyCFunction)semlock_acquire, METH_VARARGS | METH_KEYWORDS,
+    {"acquire", (PyCFunction)(void(*)(void))semlock_acquire, METH_VARARGS | METH_KEYWORDS,
      "acquire the semaphore/lock"},
     {"release", (PyCFunction)semlock_release, METH_NOARGS,
      "release the semaphore/lock"},
-    {"__enter__", (PyCFunction)semlock_acquire, METH_VARARGS | METH_KEYWORDS,
+    {"__enter__", (PyCFunction)(void(*)(void))semlock_acquire, METH_VARARGS | METH_KEYWORDS,
      "enter the semaphore/lock"},
     {"__exit__", (PyCFunction)semlock_release, METH_VARARGS,
      "exit the semaphore/lock"},