[Rd] complex tests failure

[Tomas Kalibera]

As a quick fix, you can undefine HAVE_CTANH in complex.c, somewhere 
after including config.h
An internal substitute, which is implemented inside complex.c, will be used.

Best
Tomas



On 05/04/2017 02:57 PM, Kasper Daniel Hansen wrote:
> For a while I have been getting that the complex tests fails on RHEL 6.
> The specific issue has to do with tanh (see below for full output from
> complex.Rout.fail).
>
> This is both with the stock compiler (GCC 4.4.7) and a compiler supplied
> through the conda project (GCC 4.8.5).  The compiler supplied through conda
> ends up linking R to certain system files, so the binary is not completely
> independent (although most dynamically linked libraries are coming from the
> conda installation).
>
> A search on R-devel reveals a discussion in April on an issue reported on
> Windows with a bug in tanh in old versions of the GNU C standard library;
> this seems relevant.  The discussion by Martin Maechler suggest "using R's
> internal substitute".  So how do I enable this?  Or does this requires
> updating the C standard library?
>
> ** From complex.Rout.fail
>
>> stopifnot(identical(tanh(356+0i), 1+0i))
> Error: identical(tanh(356 + (0+0i)), 1 + (0+0i)) is not TRUE
> In addition: Warning message:
> In tanh(356 + (0+0i)) : NaNs produced in function "tanh"
> Execution halted
>
> Best,
> Kasper
>
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