From 89487f51b8d6ba8a55f5de0ed689e46fefe73cc9 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@redhat.com>
Date: Thu, 23 Aug 2018 12:23:46 +0200
Subject: bpo-34207: Fix pymain_read_conf() for UTF-8 Mode (GH-8868)

bpo-34170, bpo-34207: pymain_read_conf() now sets Py_UTF8Mode to
config->utf8_mode. pymain_read_conf() calls indirectly
Py_DecodeLocale() and Py_EncodeLocale() which depend on Py_UTF8Mode.
---
 Modules/main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Modules/main.c b/Modules/main.c
index 1640758..992d720 100644
--- a/Modules/main.c
+++ b/Modules/main.c
@@ -1286,6 +1286,7 @@ static int
 pymain_read_conf(_PyMain *pymain, _PyCoreConfig *config,
                  _PyCmdline *cmdline)
 {
+    int init_utf8_mode = Py_UTF8Mode;
     _PyCoreConfig save_config = _PyCoreConfig_INIT;
     char *oldloc = NULL;
     int res = -1;
@@ -1319,6 +1320,10 @@ pymain_read_conf(_PyMain *pymain, _PyCoreConfig *config,
             goto done;
         }
 
+        /* bpo-34207: Py_DecodeLocale(), Py_EncodeLocale() and similar
+           functions depend on Py_UTF8Mode. */
+        Py_UTF8Mode = config->utf8_mode;
+
         if (pymain_init_cmdline_argv(pymain, config, cmdline) < 0) {
             goto done;
         }
@@ -1383,6 +1388,7 @@ done:
         setlocale(LC_ALL, oldloc);
         PyMem_RawFree(oldloc);
     }
+    Py_UTF8Mode = init_utf8_mode ;
     return res;
 }
 
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