RFC: building numpy against OpenBLAS.

[Federico Beffa]

Ricardo Wurmus <address@hidden> writes:

> Hi Guix,
>
> python-numpy currently depends on Atlas, which means that it cannot be
> substituted with a binary built elsewhere.  OpenBLAS is an alternative
> to Atlas and the binary can be used on all supported CPUs at runtime.
> This makes it possible for us to make numpy substitutable.

Out of curiosity, could you outline how OpenBLAS is optimized for a
specific CPU architecture while being compiled on a different CPU (and
hence allowing to be substituted)?

Thanks,
Fede