R devel - Nov 2010 - Package with multiple shared libraries

Dear R-devel members,

I would like to compile a package with two seperate shared libraries. 
For example, in a package 'foo', a file 'bar.so' built from a
distinct
set of source files should be installed in addition to the default 
'foo.so' (or .dll on windows). Does anyone know about a way to achieve 
this without having a custom Makefile, e.g. via 'Makevars'?

Also, I'd be thankful for information on existing packages which make 
use of this or a similar customization.

Just in case anyone is interested in details: I have some C-code which 
is not intended to be loaded into R but into a SQLite database to which 
I connect via RSQLite. I would like to have these object in a seperate 
library.

Thanks and kind regards,

Andreas

-- 
Andreas Borg
Medizinische Informatik

UNIVERSIT?TSMEDIZIN
der Johannes Gutenberg-Universit?t
Institut f?r Medizinische Biometrie, Epidemiologie und Informatik
Obere Zahlbacher Stra?e 69, 55131 Mainz
www.imbei.uni-mainz.de

Telefon +49 (0) 6131 175062
E-Mail: borg at imbei.uni-mainz.de

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R CMD INSTALL is R code, and you can read it for yourself rather than 
asking other people to do so for you.  If you look in
tools:::.install.packages you will see

         shlib_install <- function(instdir, arch)
         {
             files <- Sys.glob(paste0("*", SHLIB_EXT))
             if (length(files)) {
             ...

so it does in general install all the *.so or *.dll's generated.  I am 
not aware of a package that does so for more than one, though.

On Mon, 15 Nov 2010, Andreas Borg wrote:
> Dear R-devel members,
>
> I would like to compile a package with two seperate shared libraries. For 
> example, in a package 'foo', a file 'bar.so' built from a
distinct set of
> source files should be installed in addition to the default
'foo.so' (or .dll
> on windows). Does anyone know about a way to achieve this without having a 
> custom Makefile, e.g. via 'Makevars'?
>
> Also, I'd be thankful for information on existing packages which make
use of
> this or a similar customization.
>
> Just in case anyone is interested in details: I have some C-code which is
not
> intended to be loaded into R but into a SQLite database to which I connect 
> via RSQLite. I would like to have these object in a seperate library.
In which case it seems that the library should not be in the package's 
libs directory, which is intended for DSO/DLLs to be loaded into R.

If you want to do this in a public package you need to remember that 
multiple architectures are used on Mac OS and Windows.
> Thanks and kind regards,
>
> Andreas
>
> -- 
> Andreas Borg
> Medizinische Informatik
>
> UNIVERSIT?TSMEDIZIN
> der Johannes Gutenberg-Universit?t
> Institut f?r Medizinische Biometrie, Epidemiologie und Informatik
> Obere Zahlbacher Stra?e 69, 55131 Mainz
> www.imbei.uni-mainz.de
>
> Telefon +49 (0) 6131 175062
> E-Mail: borg at imbei.uni-mainz.de
-- 
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