bpo-36763: Add _Py_InitializeMain() (GH-13362)

* Add a private _Py_InitializeMain() function.
* Add again _PyCoreConfig._init_main.
* _Py_InitializeFromConfig() now uses _init_main to decide
  if _Py_InitializeMainInterpreter() should be called.
* _PyCoreConfig: rename _frozen to pathconfig_warnings, its value is
  now the opposite of Py_FrozenFlag.
* Add an unit test for _init_main=0 and _Py_InitializeMain().

1 files changed, 3 insertions, 3 deletions

diff --git a/Modules/getpath.c b/Modules/getpath.c
index 3991ad719c1..34357e47bc2 100644
--- a/Modules/getpath.c
+++ b/Modules/getpath.c
@@ -493,7 +493,7 @@ calculate_prefix(const _PyCoreConfig *core_config,
     }
 
     if (!calculate->prefix_found) {
-        if (!core_config->_frozen) {
+        if (core_config->pathconfig_warnings) {
             fprintf(stderr,
                 "Could not find platform independent libraries <prefix>\n");
         }
@@ -681,7 +681,7 @@ calculate_exec_prefix(const _PyCoreConfig *core_config,
     }
 
     if (!calculate->exec_prefix_found) {
-        if (!core_config->_frozen) {
+        if (core_config->pathconfig_warnings) {
             fprintf(stderr,
                 "Could not find platform dependent libraries <exec_prefix>\n");
         }
@@ -1206,7 +1206,7 @@ calculate_path_impl(const _PyCoreConfig *core_config,
     }
 
     if ((!calculate->prefix_found || !calculate->exec_prefix_found) &&
-        !core_config->_frozen)
+        core_config->pathconfig_warnings)
     {
         fprintf(stderr,
                 "Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]\n");