kiss-fft's builds failure on rawhide after upgrading of gcc and glibc

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Hello,

I'm trying to understand why kiss-fft (an FFT library) is failing in
rawhide only on aarch64.
The failing test does some fft calculation and compares them with the
same done with numpy.
For waht I understood the upgrade of gcc and/or glibc makes this test
fail only on aarch64, and I cannot undestand why gcc or glibc changed
the maths or the precision used on this arch.

I could disable tests, but it's not a great solution.

Can any gcc expert tell what changed between the release about math
calculation and maybe how to fix them or are these tests only a waste
of time and they should be disbled?

Thank you very much for any help.

Ciao
Guido

FAS: tartina

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