[Rd] complex tests failure

[Tomas Kalibera]

There is no way to control this at runtime.
We will probably have to add a configure test.

Best,
Tomas

On 05/04/2017 03:23 PM, Kasper Daniel Hansen wrote:
> Thanks.
>
> I assume there is no way to control this via. environment variables or 
> configure settings?  Obviously that would be great for something like 
> this which affects tests and seems to be a known problem for older C 
> standard libraries.
>
> Best,
> Kasper
>
> On Thu, May 4, 2017 at 9:12 AM, Tomas Kalibera 
> <tomas.kalibera at gmail.com <mailto:tomas.kalibera at gmail.com>> wrote:
>
>
>     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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