ImportError: dynamic module does not define module export function (PyInit__mgis)

[jeanmichelscherer]

Hi Thomas,

I would like to report on how to solve the above error I ran into when installing mgis, because others might face the same issue.

I installed boost version 1.65 with apt-get install libboost-python1.65-dev and then ran cmake .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=~/MFrontGenericInterfaceSupport/install-python-3.6/ -Denable-c-bindings=ON -Denable-fortran-bindings=ON -Denable-python-bindings=ON -DPython_ADDITIONAL_VERSIONS=3.6 as recommended in INSTALL-cmake.md.

After setting my $PYTHONPATH and $LD_LIBRARY_PATH adequately, the following error occurred:

fenics@9337a8ec9d52:~$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mgis
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/fenics/MFrontGenericInterfaceSupport/install-python-3.6/lib/python3.6/site-packages/mgis/__init__.py", line 1, in <module>
    from ._mgis import *
ImportError: dynamic module does not define module export function (PyInit__mgis)

Trying to fix this issue, I came across this thread:
https://sourceforge.net/p/tfel/discussion/installation/thread/32dd128c2a/

Adding -Denable-broken-boost-python-module-visibility-handling=ON to the cmake command above solved the problem.
mgis is now imported nicely.

Hope this can help future users.

Best,
Jean-Michel

[thelfer]

Thanks for the feed-back @jeanmichelscherer. I would admit that I totally forgot about this issue... and the fix !