From bd273c1ec320e3cfda41e5739180d86e052cbc80 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@wyplay.com>
Date: Tue, 13 Mar 2012 19:12:23 +0100
Subject: Issue #14180: Fix an invalid rounding when compiler optimization are
 enabled

Use volatile keyword to disable localy unsafe float optimizations.
---
 Python/pytime.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Python/pytime.c b/Python/pytime.c
index 75d80e2..e7dadc7 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -102,7 +102,9 @@ _PyTime_ObjectToDenominator(PyObject *obj, time_t *sec, long *numerator,
 {
     assert(denominator <= LONG_MAX);
     if (PyFloat_Check(obj)) {
-        double d, intpart, floatpart, err;
+        double d, intpart, err;
+        /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
+        volatile double floatpart;
 
         d = PyFloat_AsDouble(obj);
         floatpart = modf(d, &intpart);
-- 
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