Re: [Rd] "Use of .C for C++ is now deprecated and will be removed in R 2.12.0"

From: Prof Brian Ripley <>
Date: Wed, 21 Jul 2010 14:11:00 +0100 (BST)

Please don't pick things out of context. It does not say .C() is deprecated and it is not talking about R code: it says

There are default variables and rules for this (determined when R is configured and recorded in R_HOME/etcR_ARCH/Makeconf), providing support for C, C++, FORTRAN 77, Fortran 9x, Objective C and Objective C++ with associated extensions .c, .cc or .cpp, .f, .f90 or .f95, .m, and .mm or .M, respectively. We recommend using .h for headers, also for C++ or Fortran 9x include files. (Use of .C for C++ is now deprecated and will be removed in R 2.12.0.)

You missed 'associated extensions', and that the NEWS file says

     o	Use of file extension .C for C++ code in packages is now
 	deprecated: it has caused problems for some 'make's on
 	case-insensitive file systems (although it currently works
 	with the recommended toolkits).

On Wed, 21 Jul 2010, Florian Breitwieser wrote:

> Hi,
> I am writing a R package and having a bit of trouble to have the C++
> code working.
> I was planing using the .C interface function, however I found the
> comment (Use of .C for C++ is now deprecated and will be removed in
> R 2.12.0.) in the R-exts manual.
> So this interface function should not be used anymore - .Call() or
> Rcpp instead? What is the reason for the deprecation?
> Thanks,
> Florian
> ______________________________________________
> mailing list

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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