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

[Mike Miller]

Follow-up Comment #34, bug #45507 (project octave):

If I understand the history of this bug report, the original bug was the the
existing acos, etc, functions overflow when given large magnitude arguments.
The original set of tests were all passing, but those tests are only on
arguments with small magnitudes. Then you proposed a patch to fix this, and
Marco suggested using standard Fortran library routines instead, and I showed
that the C++ equivalents work (given a new enough GCC).

Based on that, I would think that the current #else condition will also fail
to give correct answers for the new set of tests that I added when building
with GCC 4.8. Can you test that by fudging the config.h?

So do we need an entirely new code branch anyway for the #else case if we want
to support systems with the C++ functions but bad results from those
functions?

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