[Python-Dev] Re: 2.1a2 release issues; mail.python.org still down

[M.-A. Lemburg]

"Fred L. Drake, Jr." wrote:
> 
> M.-A. Lemburg writes:
>  > I've only tested these using my mx tools compiled against 1.5 --
>  > really old, I know, but I still actively use that version. tp_xxx7/8
>  > were added in Python 1.5.2, I think, so writing to them causes
>  > the core dump.
> 
>   Yep.
> 
> I said:
>  >   For the specific problem you mention, we could add a type flag
>  > (Py_TPFLAGS_HAVE_WEAKREFS) that could be tested; it would be set in
>  > Py_TPFLAGS_DEFAULT.
> 
> M-A replied:
>  > That would work, but is it really worth it ? The APIs have changed
>  > considerably, so the fact that I got away with a warning in Python2.0
> 
>   No, which is why I'm happy to tell you to recomple your extensions.
> 
>  > doesn't really mean anything -- I do have a problem now, though,
>  > since maintaining versions for 1.5, 1.5.2, 2.0 and 2.1 will
>  > be a pain :-/
> 
>   Unless you're using PyCode_New() or PyFrame_New(), recompiling the
> extension should be all you'll need -- unless you're pulling stunts
> like ExtensionClass does (defining a type-like object using an old
> definition of PyTypeObject).  If any of the functions you're calling
> have changed signatures, you'll need to update them anyway.  The
> weakref support will not cause you to change your code unless you want
> to be able to refer to your extension types via weak refs.

The problem is not recompiling the extensions, it's that I will
have to keep compiled versions around for all versions I have installed
on my machine.
 
>  > Py_FatalError() is a bit too harsh, I guess. Wouldn't it
>  > suffice to raise an ImportError exception and have Py_InitModule()
>  > return NULL in case a module with an incompatible API version is
>  > encountered ?
> 
>   I suppose we could do that, but it'll take more than my agreement to
> make that happen.  Guido seemed to think that few modules will be
> calling PyCode_New() and PyFrame_New() directly (pyexpat being the
> exception).

The warnings are at least as annoying as recompiling the
extensions, even more since each and every imported extension
will moan about the version difference ;-)

-- 
Marc-Andre Lemburg
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