Bug#844403: src:nfft: FTBFS on ppc64el

[Breno Leitao]

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.


> 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.