[Octave-bug-tracker] [bug #47775] realpow and sparse-xpow.cc-tst fail with C++11 and gcc 4

[Lachlan Andrew]

Follow-up Comment #16, bug #47775 (project octave):

A simple response would be to make realpow give a once-off run time warning if
it was built with a version of GCC before 5.0, suggesting upgrading to 5.0 if
the user expects integer exponents to be computed exactly.

Except for the Matrix case, the special case code for integers seems just to
call a different library routine, rather than doing something that would
ensure a real answer.  This would be fixed if the scalar case also did the
repeated multiplication when the GCC version is less than 5.

Soon I'll try to write a patch to show what I mean.

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