[PyQt] PyQt on OSX Snow Leopard notes

[William Kyngesburye]

For those trying this, here's what I found so far:

- gcc compiles 64bit by default now, which will cause problems with  
the 32bit-only Qt (unless you are using Qt Cocoa).  Configure SIP  
universal so you get a 32bit SIP (the extra PPC code is harmless,  
except that PyQt will take longer to compile and be larger than  
necessary).  If you want 32bit-only or 32+64bit intel, you need to  
edit siputils.py and change the unicflags and unilflags lines  
appropriately.

- the macx-g++ Qt mkspec is meant to run the current gcc version,  
which is now 4.2.  But there is also a specifically macx-g++42  
mkspec.  I figured macx-g++ should agree more with Qt, which was built  
with gcc 4.0, so I edited it to run 4.0.  I don't know if it's really  
a problem anywhere down the line.  Maybe there should be a macx-g++40  
now.  But I don't know how to select a mkspec in the PyQt  
configuration (I haven't looked).

- the python 2.6 executable is 32+64bit now, and will run 64bit by  
default. This is a problem with pyuic4, which is a shell script which  
runs a python script (with pythonw).  At first I thought to use the  
arch command in pyuic4 shell script to run pythonw in 32bit mode, but  
apparently the arch command is broken and pythonw would still run  
64bit.  So I ended up creating a stripped copy of pythonw in /usr/ 
local/bin with ditto:

sudo ditto -arch i386 /usr/bin/pythonw2.6 /usr/local/bin/pythonw32

and running that from the pyuic4 script.  If any of your PyQt-based  
applications run from python, they'll have to use this also.  Unless,  
of course, you use Qt Cocoa and compile PyQt 64bits.

-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/

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