[issue24290] c_uint32 bitfields break structures

[Rony Batista]

New submission from Rony Batista:

ctypes Structures with c_uint32 bitfields have strange behaviour on OS X.

In the attached code when the field "number" is set, it changes the whole 32 bits, even thou its meant to be 23 bits.

The behavior is unexpected in:
OS X: Python 2.7.9

The behavior is as expected in the following environments:
Windows: python 2.7.9
Ubuntu: python 2.7.6

----------
components: ctypes
messages: 244125
nosy: Rony Batista
priority: normal
severity: normal
status: open
title: c_uint32 bitfields break structures
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24290>
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