Failing unit test in illumos (OpenIndiana)

[rikardn]

The evaluation of log(exp(-1)*pi/sin(I*sqrt(5))) in test_eval_double.cpp fails in the illumos OpenIndiana distribution.

The cause is a problem in the calculation of cpow in the illumos libc.

I opened an issue for illumos here: https://www.illumos.org/issues/15015

[bjodah]

I guess this is patched in openlibm (which I believe has its roots in Sun's libm)?

[rikardn]

Perhaps. It works fine in Julia at least:

julia> base = 4.62479554547*im
0.0 + 4.62479554547im

julia> exp = -1
-1

julia> base ^ exp
0.0 - 0.2162257747760337im

julia>

[isuruf]

Wow, that's a pretty serious libc bug. How did that go unnoticed?