Bug#1114016: openblas ftbfs with IEEE long double on ppc64el

[Matthias Klose]

On 9/10/25 09:31, Sébastien Villemot wrote:
> Control: found -1 0.3.29+ds-3
> 
> On Fri, 5 Sep 2025 12:32:41 +0200 Matthias Klose <doko at debian.org>
> wrote:
>> as a data point, 0.3.29 built fine in Ubuntu with IEEE long double.
> 
> I just rebuild 0.3.29+ds-3 on platti.debian.org, using the most recent
> gcc-15, and it also fails (same 6 failed tests). A build log is
> attached.
> 
> My understanding is that 0.3.30+ds-2 also built fine with IEEE long
> double in Ubuntu, while it failed in Debian. So it looks like Ubuntu
> and Debian behave differently with respect with this transition. Any
> explanation for the cause of this discrepancy?

ppc64el on Ubuntu builds using -O3. But I doubt that would cause this 
discrepancy.

> Another thing to be noted is that some numerical error in the testsuite
> are huge with 0.3.30+ds-2 in Debian (about 1e54 for
> dgemmt:c_api_rowmajor_upper_M_100_K_50_a_trans_b_notrans,
> dgemmt:c_api_colmajor_lower_M_50_K_100_a_notrans_b_trans,
> dgemmt:lower_M_50_K_100_a_notrans_b_trans), while they are smaller, but
> still large, with 0.3.29+ds-3.