gh-106320: Create pycore_modsupport.h header file (#106355)

Remove the following functions from the C API, move them to the internal C
API: add a new pycore_modsupport.h internal header file:

* PyModule_CreateInitialized()
* _PyArg_NoKwnames()
* _Py_VaBuildStack()

No longer export these functions.

2 files changed, 29 insertions, 12 deletions

diff --git a/Include/cpython/modsupport.h b/Include/cpython/modsupport.h
index a5d95d1..376336b 100644
--- a/Include/cpython/modsupport.h
+++ b/Include/cpython/modsupport.h
@@ -11,12 +11,9 @@ PyAPI_FUNC(int) _PyArg_UnpackStack(
     ...);
 
 PyAPI_FUNC(int) _PyArg_NoKeywords(const char *funcname, PyObject *kwargs);
-PyAPI_FUNC(int) _PyArg_NoKwnames(const char *funcname, PyObject *kwnames);
 PyAPI_FUNC(int) _PyArg_NoPositional(const char *funcname, PyObject *args);
 #define _PyArg_NoKeywords(funcname, kwargs) \
     ((kwargs) == NULL || _PyArg_NoKeywords((funcname), (kwargs)))
-#define _PyArg_NoKwnames(funcname, kwnames) \
-    ((kwnames) == NULL || _PyArg_NoKwnames((funcname), (kwnames)))
 #define _PyArg_NoPositional(funcname, args) \
     ((args) == NULL || _PyArg_NoPositional((funcname), (args)))
 
@@ -29,13 +26,6 @@ PyAPI_FUNC(int) _PyArg_CheckPositional(const char *, Py_ssize_t,
     ((!_Py_ANY_VARARGS(max) && (min) <= (nargs) && (nargs) <= (max)) \
      || _PyArg_CheckPositional((funcname), (nargs), (min), (max)))
 
-PyAPI_FUNC(PyObject **) _Py_VaBuildStack(
-    PyObject **small_stack,
-    Py_ssize_t small_stack_len,
-    const char *format,
-    va_list va,
-    Py_ssize_t *p_nargs);
-
 typedef struct _PyArg_Parser {
     int initialized;
     const char *format;
@@ -83,5 +73,3 @@ PyAPI_FUNC(PyObject * const *) _PyArg_UnpackKeywordsWithVararg(
       (minpos) <= (nargs) && (nargs) <= (maxpos) && (args) != NULL) ? (args) : \
      _PyArg_UnpackKeywords((args), (nargs), (kwargs), (kwnames), (parser), \
                            (minpos), (maxpos), (minkw), (buf)))
-
-PyAPI_FUNC(PyObject *) _PyModule_CreateInitialized(PyModuleDef*, int apiver);
diff --git a/Include/internal/pycore_modsupport.h b/Include/internal/pycore_modsupport.h
new file mode 100644
index 0000000..e577c6b
--- /dev/null
+++ b/Include/internal/pycore_modsupport.h
@@ -0,0 +1,29 @@
+#ifndef Py_INTERNAL_MODSUPPORT_H
+#define Py_INTERNAL_MODSUPPORT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+
+extern int _PyArg_NoKwnames(const char *funcname, PyObject *kwnames);
+#define _PyArg_NoKwnames(funcname, kwnames) \
+    ((kwnames) == NULL || _PyArg_NoKwnames((funcname), (kwnames)))
+
+extern PyObject ** _Py_VaBuildStack(
+    PyObject **small_stack,
+    Py_ssize_t small_stack_len,
+    const char *format,
+    va_list va,
+    Py_ssize_t *p_nargs);
+
+extern PyObject* _PyModule_CreateInitialized(PyModuleDef*, int apiver);
+
+#ifdef __cplusplus
+}
+#endif
+#endif  // !Py_INTERNAL_MODSUPPORT_H
+