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Thu Jan 6 08:31:45 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-January/050729.html

On Jan 5, 2005, at 18:46, Martin v. Löwis wrote:

> Bob Ippolito wrote:
>> I just dug up some information I had written on this particular topic  
>>  but never published, if you're interested:
>> http://bob.pythonmac.org/archives/2005/01/05/versioned-frameworks-  
>> considered-harmful/
>
> Interesting. I don't get the part why "-undefined dynamic_lookup"
> is a good idea (and this is indeed what bothered me most to begin  
> with).
> As you say, explicitly specifying the target .dylib should work as
> well, and it also does not require 10.3.

Without -undefined dynamic_lookup, your Python extensions are bound to  
a specific Python installation location (i.e. the system 2.3.0 and a  
user-installed 2.3.4).  This tends to be quite a problem.  With  
-undefined dynamic_lookup, they are not.

Just search for "version mismatch" on pythonmac-sig:
http://www.google.com/search?q=%22version+mismatch%22+pythonmac- 
sig+site:mail.python.org&ie=UTF-8&oe=UTF-8

-bob

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[Python-Dev] 2.3.5 schedule, and something I'd like to get in