[Rcpp-devel] Rcpp, Windows and CMake

[Jamie Olson]

Thanks Dirk, I'll take a stab with MSys.  Just wondering, though, why
then are the Rtools commands based on cygwin instead of MSys?

I thought that the RInside examples were to be built using Cygwin
because they use the "Unix Makefiles" generator.  I hadn't yet seen
anything to indicate that was possible on windows without cygwin.
>From the CMake wiki[http://www.cmake.org/Wiki/CMake_Generator_Specific_Information#Makefile_generators]:

This generator generates Makefiles for make under Unix and also for
cygwin (i.e. with Unix paths)


Do "Unix Makefiles" work on MSys, too, or should I use "MinGW Makefiles"?


Thanks,
--Jamie
Jamie Olson


On Wed, Jan 29, 2014 at 10:56 AM, Dirk Eddelbuettel <edd at debian.org> wrote:
>
> Hi Jamie,
>
> On 29 January 2014 at 10:39, Jamie Olson wrote:
> | Hi all,
> | I'm a relative beginner in c/c++ and I'm trying to use c/c++ libraries
> | in an R package.  I need it to work in Windows, though, and I'm
> | struggling to get things working.
> |
> | Environment:
> | R 3,0,2
> | Rtools 3.0
> | cygwin
>   ^^^^^^
>
> Not a good idea, in general, as "R is not supported on Cygwin".
>
> Use Rtools.
>
> Use something like MSys which gives you bash shell and terminal on top of
> MinGW.  But do make sure Rtools comes first in your path.
>
> | Native CMake 2.8
> | cygwin 2.8
> |
> | The cygwin CMake is convinced that the gcc installed by Rtools doesn't
> | work, because it's passing cygwin paths in the generated Unix
> | Makefiles.  The gcc fails the testCCompiler.c check with an error
> | "gcc.exe: fatal error: no input files".  If I try to actually compile
> | the file manually, it works as long as I use either relative or native
> | windows paths.
> |
> | and
> |
> | The native CMake refuses to use the Rtools gcc with MinGW Makefiles
>
> CMake should work, outside Cygwin. Folks like Peter (who may chime in) have
> used CMake with Rcpp/RInside.
>
> | I have some questions:
> |
> | 1) What would I have to do to be able to use the cygwin mingw compiler
> | instead of the Rtools version?
>
> Port R to Cygwin. Many have tried. Nobody has really succeeded. In short: Don't.
>
> | The documentation[http://cran.r-project.org/doc/manuals/R-admin.html#The-MinGW_002dw64-toolchain]
> | states:
> | Users developing packages with Rcpp need to ensure that they use a
> | version built with exactly the same toolchain as their package: the
> | recommendation is to build Rcpp from its sources yourself.
> |
> | Do I simply need to install Rcpp from source using my target compiler?
> |  Will that effect my ability to use the binary package on other
> | systems(with CRAN Rcpp)?
> |
> | 2) The RInside package contains several cmake examples.  The windows
> | examples seem to imply cygwin, but I am unable to run them as
> | indicated.  I get the same gcc error: "no input files".
>
> Yes they do, thanks to Peter. But what makes you think it implies Cygwin?
> I'd be happy to adjust / clarify documentation as needed if you can give me a pointer.
>
> Thanks,  Dirk
>
> |
> | Thanks for any help you can offer,
> | --Jamie
> |
> |
> | Jamie Olson
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>
> --
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com