[cctbxbb] Debian Package

[justin]

On 09/08/12 18:36, Luc Bourhis wrote:
> About the gold linker and libscitbx_boost_python. Thanks for keeping me
> up-to-date as I was not aware of those underlinking issues at all.
> 
> However… I have actually just realised I left out half of the phrase I
> wanted to write!
> 
>> When something is linked to libscitbx_boost_python, it is always
>> linked to libboost_python as well, which in turn is linked to
>> libpythonx.y.so.
> 
> On the one hand, libboost_python.so on Linux (and libboost_python.dylib
> on MacOS X for the record) is not directly linked to libpythonx.y.so. On
> the other hand, libboost_python is only linked to Boost Python

on gentoo it is.

 # scanelf -n /usr/lib64/libboost_python-2.7.so
 TYPE   NEEDED FILE
ET_DYN
libpython2.7.so.1.0,libpthread.so.0,libstdc++.so.6,libgcc_s.so.1,libc.so.6
/usr/lib64/libboost_python-2.7.so

But we take very strongly care of correct linking, as we are support
parallel installation of all python versions from 2.4-3.2 with all
having their own boost_python-*.so

> extensions that are loaded by Python at runtime, and then of course the
> Python exec is linked to libpythonx.y.so. So we first need to understand
> why the gold linker complains for libscitbx_boost_python but not
> for libboost_python or for any of the cctbx Boost Python extensions that
> directly use the Python API. I must admit I don't have a clue here. And
> then considering what you both told me, we need to fix the problem upstream.

For gold it was only a guess that we see chocking here, which I didn't
tested yet. But I think we should try to ensure that
libscitbx_boost_python and friends are correctly linked to
libboost_python.so. This won't harm in best case and is required in
worst case.

And on gentoo as well as on all other distros which support multiple
python ABIs to be installed, we need to ensure that the correct soname
is recorded so that the correct python ABI version of libboost_python is
loaded.

thanks justin

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