From 1efbebaac2a29ae42f3de8d74071ea2eda660711 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 10 Sep 2015 11:48:00 +0200
Subject: Try to fix test_time.test_AsSecondsDouble() on "x86 Gentoo Non-Debug
 with X 3.x" buildbot

Use volatile keyword in _PyTime_Round()
---
 Python/pytime.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

(limited to 'Python/pytime.c')

diff --git a/Python/pytime.c b/Python/pytime.c
index 243f756f3d..9470636fdc 100644
--- a/Python/pytime.c
+++ b/Python/pytime.c
@@ -75,12 +75,17 @@ _PyTime_RoundHalfEven(double x)
 static double
 _PyTime_Round(double x, _PyTime_round_t round)
 {
+    /* volatile avoids optimization changing how numbers are rounded */
+    volatile double d;
+
+    d = x;
     if (round == _PyTime_ROUND_HALF_EVEN)
-        return _PyTime_RoundHalfEven(x);
+        d = _PyTime_RoundHalfEven(d);
     else if (round == _PyTime_ROUND_CEILING)
-        return ceil(x);
+        d = ceil(d);
     else
-        return floor(x);
+        d = floor(d);
+    return d;
 }
 
 static int
-- 
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