bpo-32030: Split Py_Main() into subfunctions (#4399)

* Don't use "Python runtime" anymore to parse command line options or
  to get environment variables: pymain_init() is now a strict
  separation.
* Use an error message rather than "crashing" directly with
  Py_FatalError(). Limit the number of calls to Py_FatalError(). It
  prepares the code to handle errors more nicely later.
* Warnings options (-W, PYTHONWARNINGS) and "XOptions" (-X) are now
  only added to the sys module once Python core is properly
  initialized.
* _PyMain is now the well identified owner of some important strings
  like: warnings options, XOptions, and the "program name". The
  program name string is now properly freed at exit.
  pymain_free() is now responsible to free the "command" string.
* Rename most methods in Modules/main.c to use a "pymain_" prefix to
  avoid conflits and ease debug.
* Replace _Py_CommandLineDetails_INIT with memset(0)
* Reorder a lot of code to fix the initialization ordering. For
  example, initializing standard streams now comes before parsing
  PYTHONWARNINGS.
* Py_Main() now handles errors when adding warnings options and
  XOptions.
* Add _PyMem_GetDefaultRawAllocator() private function.
* Cleanup _PyMem_Initialize(): remove useless global constants: move
  them into _PyMem_Initialize().
* Call _PyRuntime_Initialize() as soon as possible:
  _PyRuntime_Initialize() now returns an error message on failure.
* Add _PyInitError structure and following macros:

  * _Py_INIT_OK()
  * _Py_INIT_ERR(msg)
  * _Py_INIT_USER_ERR(msg): "user" error, don't abort() in that case
  * _Py_INIT_FAILED(err)

1 files changed, 1 insertions, 3 deletions

diff --git a/Parser/pgenmain.c b/Parser/pgenmain.c
index 8f3e2f7c4e..dbdf13440a 100644
--- a/Parser/pgenmain.c
+++ b/Parser/pgenmain.c
@@ -27,13 +27,11 @@
 int Py_DebugFlag;
 int Py_VerboseFlag;
 int Py_IgnoreEnvironmentFlag;
-_PyRuntimeState _PyRuntime = {0, 0};
+_PyRuntimeState _PyRuntime = _PyRuntimeState_INIT;
 
 /* Forward */
 grammar *getgrammar(const char *filename);
 
-void Py_Exit(int) _Py_NO_RETURN;
-
 void
 Py_Exit(int sts)
 {