Issue #10372: Import the warnings module only after the IO library is

initialized, so as to avoid bootstrap issues with the '-W' option.

1 files changed, 9 insertions, 7 deletions

diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 8b1e61a1c9..784558c119 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -299,19 +299,21 @@ Py_InitializeEx(int install_sigs)
     if (install_sigs)
         initsigs(); /* Signal handling stuff, including initintr() */
 
+    initmain(); /* Module __main__ */
+    if (initstdio() < 0)
+        Py_FatalError(
+            "Py_Initialize: can't initialize sys standard streams");
+
     /* Initialize warnings. */
     if (PySys_HasWarnOptions()) {
         PyObject *warnings_module = PyImport_ImportModule("warnings");
-        if (!warnings_module)
-            PyErr_Clear();
+        if (warnings_module == NULL) {
+            fprintf(stderr, "'import warnings' failed; traceback:\n");
+            PyErr_Print();
+        }
         Py_XDECREF(warnings_module);
     }
 
-    initmain(); /* Module __main__ */
-    if (initstdio() < 0)
-        Py_FatalError(
-            "Py_Initialize: can't initialize sys standard streams");
-
     if (!Py_NoSiteFlag)
         initsite(); /* Module site */
 }