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[Octave-bug-tracker] [bug #45507] acos returns different results on big


From: Mike Miller
Subject: [Octave-bug-tracker] [bug #45507] acos returns different results on big input values on gcc 4.8
Date: Tue, 19 Sep 2017 15:25:54 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0

Follow-up Comment #58, bug #45507 (project octave):

I think rebasing mxe-octave on msys2 might bring in a new set of system
libraries. I have no idea whether this would include an up-to-date libm, or
even whether this is considered fixable or if the error is fundamental to the
Windows math libraries.

I don't think we want to return this test to an "xtest", because we don't want
it to just fail and say "expected failure" on GNU/Linux systems where this
must work correctly.

We do not have a way to flag a test "if this fails it is a regression, but
only on this operating system, on this other one it's ok to be completely
wrong".

Is anyone building Octave natively on Windows using mingw / msys or msys2? I
think it would be valuable if some of our Windows users following the default
branch would set up a real msys or msys2 development environment on Windows.

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