I've just run into the "wontfix" problem detailed here:
https://svn.boost.org/trac/boost/ticket/3210
Essentially, shared information held in one module (such as RTTI stuff
needed for dynamic cast) isn't available to another module, leading to
segfaults.
I got the impression from reading the ticket comments and the linked
email threads that the best solution is to do something like this, where
module "B" depends on module "A":
liba.so ---- C++ objects for A and Boost.Python wrappers.
a.so ------- module, linked against liba.so, just invokes wrapper
generator functions defined in liba.so within a BOOST_PYTHON_MODULE block.
libb.so ---- C++ objects for B and Boost.Python wrappers; linked against
liba.so
b.so ------- module, linked against libb.so and liba.so, just invokes
wrapper generator functions defined in libb.so within a
BOOST_PYTHON_MODULE block
However, that's not working, and the only solution I've found is to put
my modules in packages with something like the following in __init__.py:
import ctypes
ctypes.PyDLL("%s/_a" % tuple(__path__), ctypes.RTLD_GLOBAL)
from . import _a
Another similar option, using sys.setdlopenflags, seems to be less
favored because the dl module needed to get the flags has been
deprecated in Python itself.
Is this just the current state of things? Are there any efforts
underway to improve matters? Or was I on track in the first case, and I
was just doing it wrong?
Thanks!
Jim Bosch
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