[Octave-bug-tracker] [bug #61246] matrix inversions give wrong results (inv, lu, mldivide)

[Markus Mützel]

Follow-up Comment #17, bug #61246 (project octave):

Afaict, the buildbots on octave.space are using the same build rules you were
using on your AMD FX 8350 systems when Octave 6.3 was released. Yet still,
OpenBLAS seems to be working correctly if people are using the builds from
octave.space. But they seem to get wrong results if they use the installer
that was built on your system.

We had an issue in the past where somehow the processor architecture of the
build system influenced the built binaries. We presumably fixed that issue by
setting "DYNAMIC_ARCH=1 DYNAMIC_OLDER=1 TARGET=PRESCOTT" when building
OpenBLAS.
Maybe something similar is still happening?
Maybe "TARGET=PRESCOTT" wasn't a good choice?
See also:
https://github.com/xianyi/OpenBLAS#support-for-multiple-targets-in-a-single-library

The error seems to depend on the processor of the host system. It seems to be
working for me no matter which version of Octave I install. Both the
"official" installer and builds from octave.space work fine for me (Intel(R)
Core(TM) i5-4690 CPU @ 3.50GHz).

You proposed on discourse to build a release candidate:
https://octave.discourse.group/t/start-release-process-for-octave-6-4-0/1652/19

@Dmitri and Joohwa: You seem to have access to systems that are affected by
this bug. Would you be willing to check if the error still occurs for you with
a build from jwe's new build system?


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