[R-SIG-Mac] cblas on Mac and Linux

[Prof Brian Ripley]

On Fri, 20 Mar 2009, Gad Abraham wrote:

> Hi,
>
> I've got a package with some C code calling cblas functions (e.g., 
> cblas_dgemm). The code is called using .C() . In order to compile correctly 
> either cblas.h on Linux or Accelerate.h on a Mac:
>
> #include <R.h>
> #ifdef MACOSX
> #include <Accelerate/Accelerate.h>
> #else
> #include <cblas.h>
> #endif
>
> Of course, this doesn't work well with the standard Makevars 
> PKG_LIBS=$(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) since I need to set the 
> -DMACOSX flag for each platform.
>
> Do I need to create another makefile to decide which OS the code is running 
> on, or is there an easier way of doing this?

You use configure -- see 'Wrtiing R Extensions' --  to fill in a 
Makevars.in.  But beware that in general $(BLAS_LIBS does not contain 
a cblas, even on MacOS X, so if portability is any sort of issue, you 
need to set PKG_LIBS via configure too.

>
> Thanks,
> Gad
>
> -- 
> Gad Abraham
> MEng Student, Dept. CSSE and NICTA
> The University of Melbourne
> Parkville 3010, Victoria, Australia
> email: gabraham at csse.unimelb.edu.au
> web: http://www.csse.unimelb.edu.au/~gabraham
>
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-- 
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