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[Octave-bug-tracker] [bug #55538] logspace BIST tests fail when Octave b
From: |
Mike Miller |
Subject: |
[Octave-bug-tracker] [bug #55538] logspace BIST tests fail when Octave built with LLVM libc++ |
Date: |
Mon, 21 Jan 2019 12:50:05 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36 |
Follow-up Comment #1, bug #55538 (project octave):
I can confirm that this bug is entirely within the LLVM libc++ standard
library.
The following C++ program reflects a relevant piece of what Octave is doing in
the failing test:
#include <complex>
#include <limits>
#include <iostream>
int
main (int argc, char *argv[])
{
std::complex<double> x {std::numeric_limits<double>::infinity (), 1.0};
std::complex<double> y = std::pow (10.0, x);
std::cout << y << std::endl;
}
This program prints '(-inf,inf)' as expected, except when compiled with the
LLVM C++ library:
address@hidden:~/src$ g++ -o x x.cc && ./x
(-inf,inf)
address@hidden:~/src$ clang++ -stdlib=libstdc++ -o x x.cc && ./x
(-inf,inf)
address@hidden:~/src$ clang++ -stdlib=libc++ -o x x.cc && ./x
(inf,-nan)
Does anyone know if this result is dictated by the C++ standard? If so, is
there already an open LLVM bug report that we can link to?
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