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Hey All,</div>
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I think my problem is related to<span> </span><a href="http://python.6.x6.nabble.com/sip-Member-objects-and-GC-td4503261.html" style="margin: 0px">http://python.6.x6.nabble.com/sip-Member-objects-and-GC-td4503261.html</a><span style="margin: 0px">, but this
thread doesn't provide me any solution.</span></div>
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<span style="margin: 0px"><br>
</span></div>
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I have been using the following library for a long time: <a href="https://github.com/orocos/orocos_kinematics_dynamics" target="_blank" rel="noopener noreferrer" style="margin: 0px">https://github.com/orocos/orocos_kinematics_dynamics<br>
<br>
</a>I have been using ubuntu 16.04 with sip 4.15.5 for a long time. Now I am moving to ubuntu 18.04 and sip 4.15.5 isn't working anymore.<br>
<br>
Some versions of SIP will cause a segmentation fault on import of PyKDL, others will cause the following issue.<br>
<br>
By accessing a member directly after calling a constructor or other operations which will return a new instance, the data of the member is incorrect.<br>
<br>
By executing the following code:<br>
```</div>
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# Part of an unittest.Testcase</div>
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v=Vector(3,4,5)</div>
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v1=Vector(4,-2,1)</div>
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w=Wrench(Vector(7,-1,3),Vector(2,-3,3))</div>
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t=Twist(Vector(6,3,5),Vector(4,-2,7))</div>
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R = Rotation.EulerZYX(radians(10),radians(20),radians(-10))</div>
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F = Frame(R, v1)</div>
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F2 = Frame(F)</div>
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v2 = Frame(F).p</div>
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self.assertEqual(F,F2)</div>
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self.assertEqual(F.p,Frame(F).p)<br>
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```</div>
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This last line will result in the following error:</div>
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```</div>
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<span style="margin: 0px">ts/framestest.py", line 150, in testFrame<br>
</span>
<div style="margin: 0px"> self.assertEqual(F.p,Frame(F).p)<br>
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<div style="margin: 0px">AssertionError: [ 4, -2, 1] != [ 0, -2, 1]<br>
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<span style="margin: 0px"></span>```</div>
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I have tried to locate the changes which caused the problem. I did this on ubuntu 16.04 as there 4.15.5 does work. I used the master branch of the KDL libary. I have started from 4.15.5 up to newer version till the error started to show up. I found that 4.16.8
is the first version which breaks the bindings. Especially changeset 11a92ebd4840, <a href="https://www.riverbankcomputing.com/hg/sip/rev/11a92ebd4840" target="_blank" rel="noopener noreferrer" style="margin: 0px">https://www.riverbankcomputing.com/hg/sip/rev/11a92ebd4840</a>.<br>
<br>
I hope you could help.<br>
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Kind regards,<br>
Matthijs van der Burgh</div>
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