From 30a89338eb377df08ea8724809101d14612a32eb Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Tue, 23 Jun 2020 15:55:45 +0200
Subject: [PATCH] Call _PyWarnings_InitState() in subinterpreters (GH-21078)

Py_InitializeFromConfig() now calls also _PyWarnings_InitState() in
subinterpreters.
---
 Python/pylifecycle.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 4bb32abc4be..f0770727f4d 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -685,24 +685,22 @@ pycore_init_import_warnings(PyThreadState *tstate, PyObject *sysmod)
         return status;
     }
 
-    const PyConfig *config = _PyInterpreterState_GetConfig(tstate->interp);
-    if (_Py_IsMainInterpreter(tstate)) {
-        /* Initialize _warnings. */
-        status = _PyWarnings_InitState(tstate);
-        if (_PyStatus_EXCEPTION(status)) {
-            return status;
-        }
+    /* Initialize _warnings. */
+    status = _PyWarnings_InitState(tstate);
+    if (_PyStatus_EXCEPTION(status)) {
+        return status;
+    }
 
-        if (config->_install_importlib) {
+    const PyConfig *config = _PyInterpreterState_GetConfig(tstate->interp);
+    if (config->_install_importlib) {
+        if (_Py_IsMainInterpreter(tstate)) {
             status = _PyConfig_WritePathConfig(config);
             if (_PyStatus_EXCEPTION(status)) {
                 return status;
             }
         }
-    }
 
-    /* This call sets up builtin and frozen import support */
-    if (config->_install_importlib) {
+        /* This call sets up builtin and frozen import support */
         status = init_importlib(tstate, sysmod);
         if (_PyStatus_EXCEPTION(status)) {
             return status;