For future reference:
https://sourceforge.net/p/mingw-w64/mailman/message/35747206/
On Wed, Mar 22, 2017 at 2:12 PM, Jeroen Ooms <jeroeno...@gmail.com> wrote:
> This looks like a bug in mingw-w64 CRT. The problem can be produced
> with C++ without R:
>
> #include <iostream>
> #include <cmath>
> #include <complex>
>
> int main(){
> std::cout << std::fixed;
> std::complex<double> z(356, 0);
> std::cout << "tanh" << z << " = " << std::tanh(z)
> << " (tanh(356) = " << std::tanh(356) << ")\n";
> }
>
> On OS-X we get:
>
> tanh(356.000000,0.000000) = (1.000000,-0.000000) (tanh(356) = 1.000000)
>
> But on Windows we get:
>
> tanh(356.000000,0.000000) = (nan,0.000000) (tanh(356) = 1.000000)
>
> I was also able to reproduce the problem with gcc 6.3 in msys2 so it
> has not been fixed upstream. You should file a bug report for
> mingw-w64.
>
> FWIF, we have run into NaN edge-case bugs before with mingw-w64.
>
> -
> https://sourceforge.net/p/mingw-w64/mingw-w64/ci/6617ebd5fc6b790c80071d5b1d950e737fc670e1/
> -
> https://github.com/wch/r-source/commit/e9aaf8fdeddf27c2a9078cd214a41475c8ff6f40
>
> I am cc'ing Ray Donnelly who is an expert on mingw-w64.
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