New submission from Stefan Behnel: "longintrepr.h" is a non-public header file (not included by Python.h) that defines the inner struct layout of PyLong objects. Including it allows for very fast access to "small" integers through ob_digit[0] when -1 <= Py_SIZE(n) <= 1, which is a great feature.
However, the header file depends on PYLONG_BITS_IN_DIGIT being defined and matching exactly the value that was used when building CPython. In the case that --enable-big-digits=X was passed to configure, this value is available from pyconfig.h. Otherwise, it will be determined by pyport.h, where it depends on the current configuration of the C compiler and may in some cases come up with a different definition than it did when building CPython (which then leads to crashes). I'd like to have the correct build-time value always available in one way or another, e.g. by always storing it in pyconfig.h even when it was not user configured, so that including and using longintrepr.h becomes a safe and simple thing. ---------- components: Build messages: 226167 nosy: mark.dickinson, scoder priority: normal severity: normal status: open title: Make PYLONG_BITS_IN_DIGIT always available to non-core extensions type: enhancement versions: Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue22313> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
