[Patches] [ python-Patches-1718153 ] PEP 3123 implementation

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Patches item #1718153, was opened at 2007-05-13 10:21
Message generated for change (Comment added) made by gvanrossum
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Category: None
Group: Python 3000
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Martin v. Löwis (loewis)
Assigned to: Nobody/Anonymous (nobody)
Summary: PEP 3123 implementation

Initial Comment:
This patch implements the changes need for PEP 3123, in Py3k. Rather than checking this into the 3k branch, a backport of those bulk of the patch to 2.6 should be made, omitting the actual changes to PyObject_HEAD

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>Comment By: Guido van Rossum (gvanrossum)
Date: 2007-07-11 08:38

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Is this ready to be committed?

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Comment By: Martin v. Löwis (loewis)
Date: 2007-05-23 17:55

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I don't think API compatibility between 2.5 and 3.0 should be a
requirement - I expect that there will be much more breakage, making such
compatibility very difficult for other reasons.

Anyway, for everything that can be done with a macro (including
HEAD_INIT), code that wants compatibility with 2.5 and earlier should do

#ifndef MACRO
#define MACRO 2.6-content of macro
#endif

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Comment By: Neal Norwitz (nnorwitz)
Date: 2007-05-23 01:29

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I like this patch would like it to be applied to 2.6.  However, I'm
concerned about extension modules maintaining compatibility for 2.5 and
3.0.  What would that look like (ie, an extension module that can compile
with both versions)?  How would the modules need to be changed to support
both versions?  For Py_{Type,Refcnt,Size}, it looks pretty straightforward
to define the macros in 2.x and things should work fine.  But I'm not sure
about the HEAD_INIT macros.

Martin, did you try disabling the -fno-strict-aliasing with this patch to
see if there were any warnings?

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