System complex functions not detected/used on Fedora 21.

[charris]

Current state on Fedora 21.

In [2]: np.tanh(372+1j)
Out[2]: (nan+nan*j)

Looks like library function is not used. gcc 4.9.2 gives 1.000000000000000000+0.000000000000000000i, where denormals look to be flushed to zero, probably a side affect of how the function compiles. The code for that is

#include <stdio.h>
#include <math.h>
#include <complex.h>

int main(int argc, char **args)
{
    double complex z = 372.0 + 1.0 * I;
    double complex res = ctanh(z);

    printf("%20.18f%+20.18fi\n", creal(res), cimag(res));
}

[charris]

A lot of functions in complex.h are not looked for.

[mattip]

Is this still an issue?

[charris]

Looks to be fixed on my system, fedora 29, gcc 8.2. So the functions are at least looked for and the example produces

In [1]: np.tanh(372+1j)
Out[1]: (1+1.5e-323j)

[mattip]

ok, closing then.