Bug#911793: Control: reassign -1 src:gdcm 2.8.7-2

[Emmanuel Promayon]

Dear all

Thank to Paul for your answers about the autoremoval and explanation 
about the ABI problem. It seems that Adrian Bunk's triage message in 
909120 (added blocking bug(s) of 909120: 911793) did push the 
autoremoval for another month (thanks to Adrian as well, as that's 
exactly what is happening).

Thank you to Mattia for finding the ABI problem and to Matthieu for his 
comments.

Thank you to Gert for the explanation about vtk7 (by the way do you have 
any idea about the possible future introduction of vtk8 or vtk9?).
You are right about camitk-imp and camitk-config: they are not linked 
with gdcm. When camitk-imp or camitk-config are run they load some 
plugins (e.g. the dicom plugin) that itself is linked with gdcm.
Running ldd on one of the pluging get the similar missing vtk symbols 
and so.
So I suppose the problem is in vtk7

 From what I can understand (sorry in advance for any approximation or 
stating the obvious):
1) gdcm 2.8.7-2 moved to python3 (probably because a move from python2 
to python3 was required) which I think triggered the choice of moving 
from vtk6 to vtk7 (which probably made more sense, as I presume vtk6 is 
also on its way out of buster).
2) When gdcm 2.8.7-2 arrived in sid, it generated a SegFaults during  
camitk 4.1.2-1 as camitk 4.1.2-1 was still based on vtk6, and loading 
any camitk executable meant that both vtk6 and vtk7 were loaded in memory.
3) camitk 4.1.2-2 introduced a patch so that it only depends on vtk7 
(and like gdcm 2.8.7 without changing the upstream source version).
4) gdcm 2.8.7-5 then fixed the double dependency to vtk6 and vtk7 but 
camitk 4.1.2-2 was not rebuilt against it, therefore generating the 
initial error that triggered bug #911793
5) vtk7 (which was updated in the meantime) seems to have now some 
missing libraries and as hdf5 is broken as well camitk 4.1.2-2 can not 
be rebuilt yet

Let me know if there is anything I can do to help.

On a side discussion:
Does the fact that I moved the dependency of camitk from vtk6 in 4.1.2-1 
to vtk7 in 4.1.2-2 might generate another ABI break? If this is the 
case, I will take any advice regarding how to specify this properly!
I will also welcome any information/documentation about how to track the 
symbol.

Best regards
Emmanuel