Bug#1126688: openblas causes slepc4py test failure on ppc64el: Error in LAPACK subroutine gesvd: info=127

[Drew Parsons]

Source: openblas
Followup-For: Bug #1126688
X-Debbugs-Cc: debian-powerpc at lists.debian.org
User: debian-powerpc at lists.debian.org
Usertags: ppc64el
Control: tags 1126688 upstream patch

Upstream has been able to reproduce the error and identified that it
occurs when -O3 optimisation is used.

They've prepared a workaround patch enforcing -O2 in the problematic
section of code,

https://github.com/OpenMathLib/OpenBLAS/pull/5656