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List: pykde
Subject: Re: [PyQt] Python modules shouldn't link directly to Python framework
From: William Kyngesburye <woklist () kyngchaos ! com>
Date: 2008-11-21 19:55:05
Message-ID: 83BB5E5D-5363-42DF-BDC8-5DA1759A3B7E () kyngchaos ! com
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On Nov 21, 2008, at 1:06 PM, Brian Kelley wrote:
> While I agree with the sentiment “-undefined dynamic_lookup” has
> caused me issues in the past, mainly with startup time for larger
> libraries.
>
There used to be prebinding, so that startup would be faster. But
this required planning and compilation configuration that not many
projects did, especially stuff ported from *nix.
Starting with Tiger, there is a dynamic prebinding thing that is
supposed to make startup times faster after the first run of an app.
I'm not sure how this affects Python.
> We generally built python extensions that are not intended to be
> shipped individually but rather are built with our own interpreter
> which is essentially statically linked to the system python (due to
> vendorid issues). This, then, can import the PyQt dlls. Since we
> are built with a particular version of python I think it is prudent
> to not use the “-undefined dynamic_lookup” flag when using PyQt.
>
Your custom interpreter links statically to whichever Python you want,
this is normal. All extensions with dynamic_lookup that you import
from your interpreter then WILL load Python symbols from that Python,
there is no other information for the linker to think of loading from
a different Python.
> Perhaps we could use dynamic lookup across our build system, but I
> admit that it does make me nervous. In any case I’ll test any new
> PyQt that comes down the pike and let everyone know what happens.
>
> Brian Kelley
>
Any non-SIP Python extensions you use that are generated from
distutils will be using dynamic_lookup already.
I have patched my SIP, and have an app (I'm really just the packager)
in the wild for testing. No news yet, good or bad.
-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/
All generalizations are dangerous, even this one.
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