[PySide] --enable-unicode=ucs4 on Mac fails to import shiboken

Blair Zajac blair at orcaware.com
Sat Mar 17 19:15:58 CET 2012

On 03/17/2012 03:03 AM, Sebastian Wiesner wrote:
> Am 16. März 2012 18:19 schrieb Blair Zajac<blair at orcaware.com>:
>> On 03/16/2012 02:05 AM, Sebastian Wiesner wrote:
>>> Am 15. März 2012 23:19 schrieb Blair Zajac<blair at orcaware.com>:
>>>> For consistency with our Linux distro's, I've built Python 2.7 in
>>>> MacPorts using the --enable-unicode=ucs4 flag, but with this flag, the
>>>> import fails with:
>>>>   >>>    from PySide import QtGui
>>>> Traceback (most recent call last):
>>>>    File "<stdin>", line 1, in<module>
>>>> ImportError:
>>>> dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/PySide/QtGui.so,
>>>> 2): Symbol not found: _PyUnicodeUCS2
>>>>    Referenced from: /opt/local/lib/libshiboken-python2.7.1.1.dylib
>>>>    Expected in: flat namespace
>>>>   in /opt/local/lib/libshiboken-python2.7.1.1.dylib
>>>> Any idea why this would be the case?  There's no code in PySide that
>>>> explicitly lists PyUnicodeUCS2.
>>> UCS2 vs. UCS4 changes the ABI of the CPython library, hence extension
>>> modules built against an UCS2 build of CPython will not work in an
>>> UCS4 build of CPython and vice versa.
>>> Re-build shiboken against the UCS 4 build and everything should work
>>> as expected.
>> Right, I'm aware that you need to recompile everything.  This failure is
>> after a complete recompile.  Here are the commands I ran:
>> $ sudo port uninstall -v --follow-dependents python27
>> $ sudo port install -v py27-pyside
>> And then I get the link error.
> Did you make sure that you really used the ports python, and not
> accidentally the system python?

I did some follow up work at the MacPorts compile and it did pick up the 
system's Python at compile time, so it used UCS2.  I'm working with the 
port maintainer to fix it.

Sorry for the noise.


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