[Bug-gsl] Testsuite FAIL: mcholesky_invert unscaled hilbert on aarch64

[Tuomas Tynkkynen]

Hi,

Running the testsuite for GSL 2.4 fails on a aarch64 Cavium ThunderX machine:

FAIL: mcholesky_invert unscaled hilbert (  4,  4)[0,2]:
-2.55795384873636067e-13                        0
 (-2.55795384873636067e-13 observed vs 0 expected) [789499]

Full log at: 
https://nix-cache.s3.amazonaws.com/log/p65sz85d0d9aikhiy7fkbk7jrqj0592i-gsl-2.4.drv

https://savannah.gnu.org/bugs/?49697 and
https://lists.gnu.org/archive/html/help-gsl/2017-01/msg00000.html show
reports of similar errors.

GCC version is 7.3.0 and Glibc version is 2.26.