[R-pkg-devel] Package with multiple compilers?

[Kevin Ushey]

The GitHub search feature is also quite useful for seeing how other package
authors have constructed Makevars (or Makevars.win) when compiling with
custom targets. For example, a quick search of how some authors manipulate
OBJECTS in Makevars.win:


https://github.com/search?utf8=%E2%9C%93&q=OBJECTS+extension%3Awin&type=Code&ref=advsearch&l=

Of course, not all examples are good examples, but it definitely provides
examples to learn from -- and personally, my Makefile-fu is pretty weak.

Here's an example from 'gpusim' using 'nvcc' in their own Makevars.win:
https://github.com/rforge/gpusim/blob/d07dd509be5d414d3f4add66db8c841146813544/pkg/src/Makefile.win

Hopefully this gives you some more direction...

Kevin

On Fri, May 29, 2015 at 10:49 AM Duncan Murdoch <murdoch.duncan at gmail.com>
wrote:

> On 29/05/2015 9:52 AM, Charles Determan wrote:
> > I am actively working on an R package that will incorporate some CUDA
> code
> > for using NVIDIA GPU devices.  I am quite familiar with Rcpp for C++ code
> > and accustomed to using a Makevars file for specifying compiler options.
> > However I am stumped currently about how to use the NVCC compiler for the
> > .cu files.
> >
> > Typically, a CUDA program will first be compiled with NVCC and the linked
> > with any other .o files.
> >
> > # very simplified example
> > nvcc my_cuda_function.cu -o my_cuda_function.o
> > g++ -o my_program.so other_cpp_function.o my_cuda_function.o
> >
> > I have seem some older packages using a Makefile but I have also read
> that
> > this is currently recommended against because of the need for multiarch
> > builds.
> >
> > Does anyone know how I can tell R to compile .cu files with NVCC and
> > 'proceed as normal' with the resulting .o files?
>
> You can include the recipes for those .o files in your Makevars file.
> It is essentially a fragment of the full Makefile needed by your
> package.  I forget if you'll need to give an explicit recipe for the
> library, or whether the standard file will link them in. Try it!
>
> Duncan Murdoch
>
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