Your problem may be that an exception thrown in one .so isn't correctly caught
in another .so.
In the dark past we had problems like this, too. To this day I don't import
extensions
directly, but use a small wrapper function, import_ext(). The essential bit is
sys.setdlopenflags(0x100|0x2)
The hex values are platform specific. IIRC it is RTLD_NOW | RTLD_GLOBAL (may be
backwards).
You want to insert something like this right before importing your extension.
Full code:
http://cci.lbl.gov/cctbx_sources/boost_adaptbx/boost/python.py
Example boilerplate code for imports:
import boost.python
ext = boost.python.import_ext("scitbx_lbfgs_ext")
from scitbx_lbfgs_ext import *
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