changeset:   95286:e00b581a65ec
user:        Victor Stinner <victor.stinner@gmail.com>
date:        Mon Mar 30 10:22:16 2015 +0200
files:       Python/pytime.c
description:
Issue #22117: Try to fix rounding in conversion from Python double to _PyTime_t
using the C volatile keyword.


diff -r 128f92ae8bae -r e00b581a65ec Python/pytime.c
--- a/Python/pytime.c	Mon Mar 30 10:09:31 2015 +0200
+++ b/Python/pytime.c	Mon Mar 30 10:22:16 2015 +0200
@@ -207,7 +207,8 @@
 _PyTime_FromSecondsObject(_PyTime_t *t, PyObject *obj, _PyTime_round_t round)
 {
     if (PyFloat_Check(obj)) {
-        double d, err;
+        /* volatile avoids unsafe optimization on float enabled by gcc -O3 */
+        volatile double d, err;
 
         /* convert to a number of nanoseconds */
         d = PyFloat_AsDouble(obj);