[R] Cross build Makefile

[Prof Brian Ripley]

On Mon, 21 Jun 2004, Iago Mosqueira wrote:

> Hello,
> 
> I am trying to use Yan and Rossini's Makefile for cross building Windows
> versions of R packages in Linux with R 1.9.0. When compiling R with the
> mingw tools I get an error about expm1 being undeclared when first found
> at src/main/arithmetic.c:1019
> 
> If I fiddle a bit with it later on I also get errors about log1p bein
> undeclared.
> 
> Any idea what should I look for?
> 
> I am using R 1.9.0 in Debian, with R-mathlib avaliable, and gcc 3.3.

Did you build your own cross-compiler, or where did you get it from?

log1p is definitely declared in math.h these days, but it used not to be, 
so that one might be due to using too old a cross-compiler.

For expm1, the Windows config.h has /* #undef HAVE_EXPM1 */ which means it 
is declared in Rmath.h and compiled up as part of libnmath.a.  Here all I 
can suggest is that you check the headers files are correct and that you 
are finding the ones for cross-compiling and not for Linux compiling 
(which can be a problem if the cross-compiler was built incorrectly or you 
configured R in that source tree without the right options).

BTW, I think this topic might be more appropriate on R-devel, as most 
readers of R-help will not know what `cross build' is.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595