New submission from Alexey Izbyshev <izbys...@ispras.ru>:
Victor Stinner pointed out that on x86 Gentoo Installed with X 3.x buildbot, there is a compiler warning: Python/pystate.c:1483:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] (https://buildbot.python.org/all/#/builders/103/builds/2067) This warning reveals a bug: static int _long_shared(PyObject *obj, _PyCrossInterpreterData *data) { int64_t value = PyLong_AsLongLong(obj); if (value == -1 && PyErr_Occurred()) { if (PyErr_ExceptionMatches(PyExc_OverflowError)) { PyErr_SetString(PyExc_OverflowError, "try sending as bytes"); } return -1; } data->data = (void *)value; A 64-bit value is converted to void *, which is 32-bit on 32-bit platforms. I've implemented a PR that uses Py_ssize_t instead to match the pointer size and to preserve the ability to work with negative numbers. ---------- assignee: izbyshev components: Extension Modules messages: 335272 nosy: eric.snow, izbyshev, vstinner priority: normal severity: normal status: open title: _xxsubinterpreters: channel_send() may truncate ints on 32-bit platforms type: behavior versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35972> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
