[issue39295] usage of bitfields in ctypes structures changed between 3.7.5 and 3.7.6

Matthew Newville added the comment: @eryksun Sorry for the imprecision -- I was mixing what we do on Linux and Windows. A minimum verifiable example for Linux/MacOS would be import ctypes class bitstruct(ctypes.Structure): _fields_ = [('addr', cty

[issue39295] usage of bitfields in ctypes structures changed between 3.7.5 and 3.7.6

Matthew Newville added the comment: So, again, I'm trying to understand what the best workaround for this change is. I asked "can this workaround be improved" twice and got no reply, while getting plenty of responses to questions about the development process. I take this t

[issue39295] usage of bitfields in ctypes structures changed between 3.7.5 and 3.7.6

Matthew Newville added the comment: Thanks for the reply and the fix -- I have not tried the master branch, but will try to do that soon. If I understand correctly, we will have to stick with our kludgy "workaround" version in order to work with Python 3.7.6 and 3.8.1. Or is ther

[issue39295] usage of bitfields in ctypes structures changed between 3.7.5 and 3.7.6

New submission from Matthew Newville : We have a library (https://github.com/pyepics/pyepics) that wraps several C structures for a communication protocol library that involves many C->Python callbacks. One of the simpler structures we wrap with ctypes is defined with typedef str