I created an even smaller failing example, one without libeigen: https://gitlab.com/cosurgi/minieigen-real/blob/minimalFailingFloat128/src/mi... And the pipeline: https://gitlab.com/cosurgi/minieigen-real/pipelines/104749255 Here you can clearly see that it crashes with def_visitor only. best regards Janek Kozicki Janek Kozicki said: (by the date of Sat, 21 Dec 2019 00:14:56 +0100)

I have discovered an alignment related bug in boost::python::def_visitor

For a very detailed description see https://gitlab.com/libeigen/eigen/issues/1795

* a minimal failing example: https://gitlab.com/cosurgi/minieigen-real/blob/minimalFailingExample/src/min...

* and the failing CI pipeline: https://gitlab.com/cosurgi/minieigen-real/pipelines/104745741

Initially I thought that it was related with libeigen. But it turns out that it crashes even without libeigen, when just using boost::multiprecision::float128.

The code crashes with g++ 8.3.0 and works with g++ 9.2.1 boost version 1.67 is used there.

should I open an issue on boost github?

best regards -- # Janek Kozicki http://janek.kozicki.pl/

-- # Janek Kozicki http://janek.kozicki.pl/