[Octave-bug-tracker] [bug #45507] acos returns different results on big input values on gcc 4.8

[Mike Miller]

Follow-up Comment #43, bug #45507 (project octave):

FTR I think the fixes to these functions occurred in libm somewhere between
glibc 2.19 and 2.22 (because we have Ubuntu 14.04 users saying it fails, but
it works for me on Debian stretch). I don't think the version of GCC matters
for this, since the C++ functions just forward the arguments to the
appropriate libc functions.

So some kind of configure test could be done for these calls, but we'd need
someone to contribute some kind of wrapper, possibly pulled from glibc, that
would stand in for the broken function(s).

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