bpo-33012: Fix invalid function cast warnings with gcc 8 for METH_NOARGS. (GH-6030)

METH_NOARGS functions need only a single argument but they are cast
into a PyCFunction, which takes two arguments.  This triggers an
invalid function cast warning in gcc8 due to the argument mismatch.
Fix this by adding a dummy unused argument.

1 files changed, 3 insertions, 3 deletions

diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 94f290853c..839258b874 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -619,7 +619,7 @@ filter_next(filterobject *lz)
 }
 
 static PyObject *
-filter_reduce(filterobject *lz)
+filter_reduce(filterobject *lz, PyObject *Py_UNUSED(ignored))
 {
     return Py_BuildValue("O(OO)", Py_TYPE(lz), lz->func, lz->it);
 }
@@ -1331,7 +1331,7 @@ exit:
 }
 
 static PyObject *
-map_reduce(mapobject *lz)
+map_reduce(mapobject *lz, PyObject *Py_UNUSED(ignored))
 {
     Py_ssize_t numargs = PyTuple_GET_SIZE(lz->iters);
     PyObject *args = PyTuple_New(numargs+1);
@@ -2656,7 +2656,7 @@ zip_next(zipobject *lz)
 }
 
 static PyObject *
-zip_reduce(zipobject *lz)
+zip_reduce(zipobject *lz, PyObject *Py_UNUSED(ignored))
 {
     /* Just recreate the zip with the internal iterator tuple */
     return Py_BuildValue("OO", Py_TYPE(lz), lz->ittuple);