be careful mixing versions of CasaCore

[mweastwood]

This issue is a warning/reminder for myself until this is better documented.

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When copying a measurement set between machines I got a segfault when trying to create a new column:

signal (11): Segmentation fault
_ZN4casa7SSMBase12removeColumnEPNS_17DataManagerColumnE at /scr2/mweastwood/usr/lib/libcasa_tables.so.2 (unknown line)
_ZN4casa9ColumnSet11doAddColumnERKNS_10ColumnDescEPNS_11DataManagerE at /scr2/mweastwood/usr/lib/libcasa_tables.so.2 (unknown line)
_ZN4casa9ColumnSet9addColumnERKNS_10ColumnDescEbRKNS_9TSMOptionERNS_5TableE at /scr2/mweastwood/usr/lib/libcasa_tables.so.2 (unknown line)
_ZN4casa10PlainTable9addColumnERKNS_10ColumnDescEb at /scr2/mweastwood/usr/lib/libcasa_tables.so.2 (unknown line)
_ZN4casa5Table9addColumnERKNS_10ColumnDescEb at /scr2/mweastwood/julia-packages/v0.4/CasaCore/src/../deps/libcasacorewrapper.so (unknown line)
_Z15addScalarColumnIiEvPN4casa10TableProxyEPc at /scr2/mweastwood/julia-packages/v0.4/CasaCore/src/../deps/libcasacorewrapper.so (unknown line)
addScalarColumn_int at /scr2/mweastwood/julia-packages/v0.4/CasaCore/src/../deps/libcasacorewrapper.so (unknown line)
create_column! at /scr2/mweastwood/julia-packages/v0.4/CasaCore/src/tables.jl:259
Segmentation fault (core dumped)

It seems that the problem is that the measurement set was created on a machine with CasaCore v1.7 and I was trying to add a new column with a machine that is using CasaCore v2.0. So we need to be careful and consistent about which version we are using.

[tammojan]

This should not happen. When a measurement set is written, it should be readable by all versions of casacore. Could it be that you had two versions of casacore on the same machine, and a shared library of a different version was found at runtime?