Ok, summary of the day :
Windows 7 / Python 3.5 (miniconda) / ITK 4.12 (conda-forge) - OK
Windows 7 / Python 3.5 (miniconda) / ITK 4.13 (conda-forge) - OK
Windows 7 / Python 3.5 (miniconda) / ITK 5.0 (conda-forge) - OK
Ubunutu 18.04 / Python 3.6 (anaconda) / ITK 4.13 (conda-forge) - OK
macOS 10.13.3 / Python 3.5 (anaconda) / ITK 4.13 (conda-forge) - Bus error: 10
macOS 10.13.3 / Python 3.6 (anaconda) / ITK 4.13 (conda-forge) - Floating point exception: 8
… seems like the macOS wrapping is not working …
[edit] I also tried using native Python installations (without conda) and various ITK version (4.12, 4.13, 5.0) … all ended with errors under macOS while everything seems to work perfectly with Windows/Linux
__[edit 2]__I used macOS 10.13