[Python-modules-team] Bug#589893: python-qt4: has bad linking for shared objects

[Jakub Wilk]

* Alan W. Irwin <irwin at beluga.phys.uvic.ca>, 2010-07-21, 18:40:
>>>ldd -r /usr/lib/pyshared/python2.6/PyQt4/Qt.so
>>>
>>>You obtain the following (abbreviated) results:
>>>
>>>       linux-vdso.so.1 =>  (0x00007fffcc7ff000)
>>>       libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x00007f9d75e91000)
>>>       libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f9d75b7d000)
>>>       libm.so.6 => /lib/libm.so.6 (0x00007f9d758fa000)
>>>       libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f9d756e4000)
>>>       libc.so.6 => /lib/libc.so.6 (0x00007f9d75383000)
>>>       libpthread.so.0 => /lib/libpthread.so.0 (0x00007f9d75166000)
>>>       libz.so.1 => /usr/lib/libz.so.1 (0x00007f9d74f4f000)
>>>       libdl.so.2 => /lib/libdl.so.2 (0x00007f9d74d4b000)
>>>       libgthread-2.0.so.0 => /usr/lib/libgthread-2.0.so.0 
>>>(0x00007f9d74b46000)
>>>       librt.so.1 => /lib/librt.so.1 (0x00007f9d7493e000)
>>>       libglib-2.0.so.0 => /lib/libglib-2.0.so.0 (0x00007f9d74662000)
>>>       /lib64/ld-linux-x86-64.so.2 (0x00007f9d7675b000)
>>>       libpcre.so.3 => /lib/libpcre.so.3 (0x00007f9d74432000)
>>>undefined symbol: PyProperty_Type 
>>>(/usr/lib/pyshared/python2.6/PyQt4/QtCore.so)
>>>[...]
>>
>>This is intentional. Python extensions use symbols provided by
>>/usr/bin/pythonX.Y, but they are not supposed to be linked with libpythonX.Y.
>
>Hi Jakub:
>
>Thanks for your quick response.
>
>I am pretty sure I have analyzed pyqt4 extensions before for Debian
>Lenny with ldd -r with no undefined symbols showing up.  Therefore,
>(if I am remembering that old behaviour correctly) this appears to be
>a change in behaviour for what was done for Debian Lenny. If so, I am
>curious about the motivation for this change.

No, lenny's python-qt4 extensions are not linked with libpythonX.Y 
either.

>At run time for a pyqt4 example for PLplot, I am getting the following
>error:
>
>Traceback (most recent call last):
>  File
>"/home/software/plplot_svn/HEAD/build_dir/examples/python/pyqt4_example.py",
>line 33, in <module>
>    import plplot_pyqt4
>    ImportError: /usr/lib/pymodules/python2.6/PyQt4/QtCore.so:
>undefined symbol: _ZN10QTextCodec11validCodecsEv
>
>The "ldd -r" command shows there are no undefined symbols with
>plplot_pyqt4.so.  So I started looking at the pyqt4 modules and I
>found the following:
>
>software at raven> ldd -r /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
>2>&1 |grep -i codec
>undefined symbol: _ZN10QTextCodec11validCodecsEv
>(/usr/lib/pymodules/python2.6/PyQt4/QtCore.so)

Now, *this* looks like a real bug, but it has nothing to do with linking 
to libpythonX.Y.

-- 
Jakub Wilk
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