gh-105145: Remove old functions to config Python init (#105154)

Remove the following old functions to configure the Python
initialization, deprecated in Python 3.11:

* PySys_AddWarnOptionUnicode()
* PySys_AddWarnOption()
* PySys_AddXOption()
* PySys_HasWarnOptions()
* PySys_SetArgvEx()
* PySys_SetArgv()
* PySys_SetPath()
* Py_SetPath()
* Py_SetProgramName()
* Py_SetPythonHome()
* Py_SetStandardStreamEncoding()
* _Py_SetProgramFullPath()

Most of these functions are kept in the stable ABI, except:

* Py_SetStandardStreamEncoding()
* _Py_SetProgramFullPath()

Update Doc/extending/embedding.rst and Doc/extending/extending.rst to
use the new PyConfig API.

_testembed.c:

* check_stdio_details() now sets stdio_encoding and stdio_errors
  of PyConfig.
* Add definitions of functions removed from the API but kept in the
  stable ABI.
* test_init_from_config() and test_init_read_set() now use
  PyConfig_SetString() instead of PyConfig_SetBytesString().

Remove _Py_ClearStandardStreamEncoding() internal function.

1 files changed, 6 insertions, 25 deletions

diff --git a/Python/pathconfig.c b/Python/pathconfig.c
index be0f97c..afffa13 100644
--- a/Python/pathconfig.c
+++ b/Python/pathconfig.c
@@ -211,7 +211,8 @@ path_out_of_memory(const char *func)
     _Py_FatalErrorFunc(func, "out of memory");
 }
 
-void
+// Removed in Python 3.13 API, but kept for the stable ABI
+PyAPI_FUNC(void)
 Py_SetPath(const wchar_t *path)
 {
     if (path == NULL) {
@@ -252,7 +253,8 @@ Py_SetPath(const wchar_t *path)
 }
 
 
-void
+// Removed in Python 3.13 API, but kept for the stable ABI
+PyAPI_FUNC(void)
 Py_SetPythonHome(const wchar_t *home)
 {
     int has_value = home && home[0];
@@ -275,7 +277,8 @@ Py_SetPythonHome(const wchar_t *home)
 }
 
 
-void
+// Removed in Python 3.13 API, but kept for the stable ABI
+PyAPI_FUNC(void)
 Py_SetProgramName(const wchar_t *program_name)
 {
     int has_value = program_name && program_name[0];
@@ -297,28 +300,6 @@ Py_SetProgramName(const wchar_t *program_name)
     }
 }
 
-void
-_Py_SetProgramFullPath(const wchar_t *program_full_path)
-{
-    int has_value = program_full_path && program_full_path[0];
-
-    PyMemAllocatorEx old_alloc;
-    _PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
-
-    PyMem_RawFree(_Py_path_config.program_full_path);
-    _Py_path_config.program_full_path = NULL;
-
-    if (has_value) {
-        _Py_path_config.program_full_path = _PyMem_RawWcsdup(program_full_path);
-    }
-
-    PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
-
-    if (has_value && _Py_path_config.program_full_path == NULL) {
-        path_out_of_memory(__func__);
-    }
-}
-
 
 wchar_t *
 Py_GetPath(void)