Re: [Pyobjc-dev] PyObjC and OSX versions

[Ronald O. <ron...@ma...>]

On 3 Apr, 2010, at 15:41, Aahz wrote:

> On Thu, Apr 01, 2010, Ronald Oussoren wrote:
>> 
>> W.r.t. 10.4 support in general: I'd say that it is more worthwhile to
>> work on porting PyObjC 2.2 to 10.4 than to try to create a workflow
>> using both PyObjC 1.4 and 2.2.  For the most part this entails adding
>> #ifdef guards in the C modules to ensure that the wrappers for APIs
>> that aren't available on 10.4 get excluded from the build when
>> building using the 10.4 SDK.
> 
> That still means it's going to be tricky writing an app that uses
> FSEvents on 10.5+ that works without FSEvents on 10.4 -- instead of
> maintaining separate installs of PyObjC 1.4 and 2.2, I'll need to have
> separate installs of 2.2 and 2.2, and keeping track of which is which
> will be more difficult.
> 
> Perhaps I'm missing something?  Would it be possible to build PyObjC 2.2
> on 10.5 in a way that works on 10.4, just with FSEvents disabled?

That's pretty easy to do, although I don't recall if I have prepared the code for it.  This basicly requires weak-linking to any symbols that aren't available on 10.4 and dealing with the NULL pointers that you might get because of that.

An example of this is Modules/posixmodule.c in the python tree.  That uses weaklinking to ensure that os.lchown (and several other symbols) are present on OSX releases that have it while still working on older OSX releases. 

> 
> There's a reasonably good chance we're going to switch to kauth due to
> FSEvents' limitations, which would sidestep the issue another way.  Does
> anyone have any experience using kauth?

What's kauth?

> 
> Before someone asks, kqueue is not sufficient for our needs (monitoring
> directory systems that might have a million files), and pnotify has
> languished for so long without update that I'm not willing to take a
> chance with it.  I think that pretty much exhausts the available options.

Ronald


> -- 
> Aahz (aa...@py...)           <*>         http://www.pythoncraft.com/
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