[C++-sig] Re: BPL on MSVC7.1 -w3 warnings

Mike Rovner mike at nospam.com
Tue Nov 4 18:11:31 CET 2003

David Abrahams wrote:
> Beautiful. Committed.

In the light of 2.4 we may have to patch it back ;)

Here is MvL responce on the subject:

"Mike Rovner" <mike at nospam.com> writes:

>> That may even be a source of bugs. I'm in the process of putting
>> size_t in every place Python currently uses "int" or "long" to store a
>> number of bytes. In some cases, exceeding 4GB (sometimes 2GB) will
>> cause crashes in Python 2.3 (in other cases, this is somewhat overkill
>> - eg. when the compiler complains that strlen(some_file_name) may not
>> fit into 4 bytes).
> Does that mean forthcoming API interface change?

Yes. I haven't changed any structure (yet), but, after approval on
python-dev, this is likely to happen as well.

> There are mostly ints for sizes (ex. PyString_AsStringAndSize
> (PyObject *obj, char **buffer, int *length)).

Indeed. I don't think it matters, though: processors typically return
results in registers. On a 64-bit processor, a single register will
take the result, and most likely, a 32-bit return value will be
widened appropriately. So you might actually get away with not
recompiling the extensions in 2.4 (atleast until ob_size changes,
which does cause incompatibilities on big-endian machines).


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