[Octave-bug-tracker] [bug #48363] __run-test_suite_ FAILs for data-cc.tst ('NaN' mismatches)

[Mike Miller]

Follow-up Comment #4, bug #48363 (project octave):

The two-output-argument form is calling std::frexp, the single-return-value
form is calling std::log2.

Ah, according to the gnulib manual section on frexp, this may have been fixed
before when we were using gnulib, which we lost recently:

> This function does not work on infinite numbers on some
> platforms: IRIX 6.5, mingw, MSVC 9

(from https://www.gnu.org/software/gnulib/manual/html_node/frexp.html)

So this is exactly the type of bug that we were trying to fix by using gnulib,
but GCC 6 has decided is bad to try to address (because they want std::frexp
to only be able to call the system C library frexp function, not any
replacement you may define).

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