http://hg.python.org/cpython/rev/f71249d785d6 changeset: 74682:f71249d785d6 user: Victor Stinner <victor.stinner@haypocalc.com> date: Mon Jan 30 00:07:43 2012 +0100 summary: Issue #13874: read_null() of faulthandler uses volatile to avoid optimisation Clang 3.0 removes "y = *x;" instruction if the optimisation level is 3. files: Modules/faulthandler.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c --- a/Modules/faulthandler.c +++ b/Modules/faulthandler.c @@ -943,10 +943,13 @@ static PyObject * faulthandler_read_null(PyObject *self, PyObject *args) { - int *x = NULL, y; + volatile int *x; + volatile int y; int release_gil = 0; if (!PyArg_ParseTuple(args, "|i:_read_null", &release_gil)) return NULL; + + x = NULL; if (release_gil) { Py_BEGIN_ALLOW_THREADS y = *x; -- Repository URL: http://hg.python.org/cpython