Bug#844403: src:nfft: FTBFS on ppc64el

[Ghislain Vaillant]

On Mon, 28 Nov 2016 11:24:27 -0200 Breno Leitao <brenohl at br.ibm.com> wrote:
> On 11/27/2016 07:16 PM, Ghislain Vaillant wrote:
> > On Thu, 24 Nov 2016 18:49:29 -0200 Breno Leitao <brenohl at br.ibm.com> wrote:
> >> I am looking at this issue, and the first test set is checkall.
> >>
> >> If I run it inside dpkg-buildpackage, it fails as in the log, but, if I run
> >> it isolated, I see no errors, as showed:
> >>
> >>   $ ./checkall 2>&1 | grep -i fail
> >>   $
> >>
> >> Looking all tests I see "-> OK". Anyway, I am continue to debug what is the
> >> problem here.
> >
> > It could be a lucky shot. Have you tried running them multiple times?
>
> Yes, and it works, but it fails when running in multi thread mode. Anyway, I
> am able to reproduce the problem here.

Ack.

>
> > If you look carefully at the log you will find that some tests have an
> > unrealistically low tolerance value (in the order of 1E-322), which make them
> > succeed when the difference is exactly 0 and fail otherwise.
>
> That is interesting, Float precision might be a platform characterstic,
> mainly if using long double, or, quad float precision.
>
> Anyway, I will go deeper in the code to understand the problem here.

I might eventually just bypass testing for ppc64el to let the package 
transition to testing, unless you think you are gonna have a fix ready 
very soon. With the transition window extended to 10 days and the 
soft-freeze deadline happening, I cannot wait for very much longer.

Please keep me up-to-date, and thanks for investigating.

Ghis