From 0a8572800b08ee2598d3db2b7b24bd3884ba11cd Mon Sep 17 00:00:00 2001
From: "Gregory P. Smith" <greg@krypto.org>
Date: Tue, 4 Aug 2015 16:29:00 -0700
Subject: [PATCH] Don't left shift negative values.  Use an unsigned value
 instead to avoid undefined behavior.

---
 Modules/cPickle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/cPickle.c b/Modules/cPickle.c
index 91f3ee7bd5a..89448a6f419 100644
--- a/Modules/cPickle.c
+++ b/Modules/cPickle.c
@@ -3448,7 +3448,7 @@ calc_binint(char *s, int x)
      * to extend a BININT's sign bit to the full width.
      */
     if (x == 4 && l & (1L << 31))
-        l |= (~0L) << 32;
+        l |= (~0UL) << 32;
 #endif
     return l;
 }