Thank you very much for the notes.
The Eigen code I see does everything with the preprocessor. Which is
fine, and doesn't mean that it must crash. For the specific package I'm
building (libg2o) Eigen is the only option, but this sounds like a
generic problem that affects all sorts of packages,
I did something similar. Here is my example:
The linker script is here:
https://salsa.debian.org/science-team/blis/-/blob/master/debian/version_script.lds
This script is used like this:
https://salsa.debian.org/science-team/blis/-/blob/master/debian/patches/libblas-provider.patch
This patch
Don't know how to address this issue but have some relevant comments.
Eigen library does not support run time dispatch for CPU ISAs.
When a package is built upon the amd64 baseline ISA but ran on a modern
CPU, the performance can be very poor.
This is why I build the tensorflow and pytorch
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