[R] R CMD SHLIB changes function name when compiling

[Prof Brian Ripley]

On Fri, 8 Oct 2010, Steve Pederson wrote:

> Hi,
>
> I'm trying to write a function in C for implementation with .Call. When 
> compiling using R CMD SHLIB characters seem to be added to the function name.
>
> Here's the complete C code from the file summariseMCMC.c:
>
> #include<R.h>
> #include<Rdefines.h>
> #include<Rinternals.h>
>
> void summariseMCMC(SEXP data) {
>
>    PROTECT(data=AS_NUMERIC(data));
>    UNPROTECT(1);
>
> }
>
> Then after compiling  (R CMD SHLIB summariseMCMC.c) & loading the .dll
>
> dyn.load("C:/R/R-2.11.1/bin/summariseMCMC.dll")
> is.loaded("_Z13summariseMCMCP7SEXPREC")
> [1] TRUE
> is.loaded("summariseMCMC")
> [1] FALSE
>
> Just wondering if anyone had any pointers for getting rid of this, or have I 
> missed something outrageously obvious?

You have.  This was not done by'R CMD SHLIB', but by a C++ compiler -- 
it is called 'name mangling'. Unfortunately you didn't show us the 
output from that command, when the cause would probably have been 
'outrageously obvious'.

The fix is to make sure you use a C compiler to compile C code, and 
we've almost no idea why that is not being done on your system.
But as a guess, check that the environment variable CC is not set.

>
> Thanks,
>
> Steve
>
>
> sessionInfo()
> R version 2.11.1 (2010-05-31)
> i386-pc-mingw32
>
> locale:
> [1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252
> [3] LC_MONETARY=English_Australia.1252 LC_NUMERIC=C
> [5] LC_TIME=English_Australia.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] limma_3.4.4            Biobase_2.8.0          aroma.affymetrix_1.7.0
> [4] aroma.apd_0.1.7        affxparser_1.20.0      R.huge_0.2.0
> [7] aroma.core_1.7.0       aroma.light_1.16.0     matrixStats_0.2.1
> [10] R.rsp_0.3.6            R.cache_0.3.0          R.filesets_0.8.3
> [13] digest_0.4.2           R.utils_1.4.4          R.oo_1.7.3
> [16] R.methodsS3_1.2.0
>
> loaded via a namespace (and not attached):
> [1] tools_2.11.1
>
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> and provide commented, minimal, self-contained, reproducible code.
>

-- 
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