bpo-34170: Rework _PyCoreConfig_Read() to avoid side effect (GH-8353)

Rework _PyCoreConfig_Read() function which *reads* core configuration
to not *modify* the path configuration.

A new _PyCoreConfig_SetPathConfig() function now recreates the path
configuration from the core configuration. This function is now
called very late in _Py_InitializeCore(), just before calling
initimport().

Changes:

* Add _PyCoreConfig.dll_path
* Py_SetPath() now fails with a fatal python error on memory
   allocation failure.
* Rename _PyPathConfig_Calculate() to _PyPathConfig_Calculate_impl()
* Replace _PyPathConfig_Init() with _PyPathConfig_Calculate(): the
  function now requires a _PyPathConfig
* Add _PyPathConfig_SetGlobal() to set the _Py_path_config global
  variable.
* Add _PyCoreConfig_InitPathConfig(): compute the path configuration
* Add _PyCoreConfig_SetPathConfig(): set path configuration from core
  configuration
* Rename wstrlist_append() to _Py_wstrlist_append()
* _Py_wstrlist_append() now handles integer overflow.

1 files changed, 1 insertions, 1 deletions

diff --git a/Modules/getpath.c b/Modules/getpath.c
index 755298e..6d966e1 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -946,7 +946,7 @@ calculate_path_impl(const _PyCoreConfig *core_config,
 
 
 _PyInitError
-_PyPathConfig_Calculate(_PyPathConfig *config, const _PyCoreConfig *core_config)
+_PyPathConfig_Calculate_impl(_PyPathConfig *config, const _PyCoreConfig *core_config)
 {
     PyCalculatePath calculate;
     memset(&calculate, 0, sizeof(calculate));