[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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[issue24290] c_uint32 bitfields break structures

[Rony Batista]

Rony Batista added the comment:

Silly me, Heres the code.

--
Added file: http://bugs.python.org/file39508/ctypesBug.py

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[issue24290] c_uint32 bitfields break structures

[Rony Batista]

Rony Batista added the comment:

Well, looks like the issue is with 64 bit mode then.

For the first 5 cases the right answer is 69.95930480957031, and for the last 2 
its -69.95930480957031. The results for the 32 bit mode are all correct.

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