[Python-modules-team] Bug#915738: python-scipy should use the default gfortran on s390x

Aurelien Jarno aurelien at aurel32.net
Sat Dec 29 21:09:25 GMT 2018

On 2018-12-22 15:02, Mattia Rizzolo wrote:
> On Thu, Dec 06, 2018 at 03:21:29PM +0100, Matthias Klose wrote:
> > Please use the default GCC for the package so that we can remove GCC 7 for the
> > buster release.
> Befpre anybody starts dumbingly removing that build-dep, please be aware
> that it was done due to #906198, e.g. some kind of miscompilation with
> gcc-8 on s390x only.
> TTBOMK the actual bug has not been debugged by anybody yet.

The bug seems to be a miscompilation of scipy/optimize/minpack/qrsolv.f
with -funroll-loops. Removing -funroll-loops is enough to get the
leastsq testcase to pass. Now I am not used to fortran code, so I don't
know how to move that forward.

Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien at aurel32.net                 http://www.aurel32.net
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