From 472fc843ca816d65c12f9508ac762ca492165c45 Mon Sep 17 00:00:00 2001
From: Stefan Krah <skrah@bytereef.org>
Date: Tue, 24 Mar 2020 14:01:13 +0100
Subject: bpo-39689: Do not use native packing for format "?" with standard
 size (GH-18969)

---
 Modules/_struct.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/_struct.c b/Modules/_struct.c
index b4b52a7..242ca9c 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -2407,6 +2407,9 @@ PyInit__struct(void)
                        "unknown" float format */
                     if (ptr->format == 'd' || ptr->format == 'f')
                         break;
+                    /* Skip _Bool, semantics are different for standard size */
+                    if (ptr->format == '?')
+                        break;
                     ptr->pack = native->pack;
                     ptr->unpack = native->unpack;
                     break;
-- 
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