[Rcpp-devel] Can an Rcpp package include Fortran code?

[Kevin Ushey]

My best guess is that the issue here is that 'gfortran' is being used for
linking, e.g.

c:/Rtools/mingw_64/bin/gfortran -shared -s
-Wl,--allow-multiple-definition -static-libgcc -o ForTest.dll tmp.def
RcppExports.o VecSum_C.o VecSum_F.o -LC:/R/RLocalSoft/lib/x64
-LC:/R/RLocalSoft/lib -LC:/R/RCurrent/R-33~1.1PA/bin/x64 -lR

You likely need to force the C++ compiler (g++) to be used for linking,
although I'm not exactly ensure how to accomplish this. Hopefully, setting
one of:

   SHLIB_LD = $(CXX)
   SHLIB_FCLD = $(CXX)
   DYLIB_LD = $(CXX)

in your src/Makevars[.win] will be sufficient, but no guarantees...

Kevin

On Thu, Oct 6, 2016 at 9:37 AM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> On 6 October 2016 at 12:19, Avraham Adler wrote:
> | Has anyone successfully created a package that uses Rcpp for C++ code
> | and which also has Fortran code? I'm experimenting with comparing
> | Fortran and C++ and if I could use Rcpp to handle the C++ portion, it
> | would reduce the steepness of the learning curve.
> |
> | However, I haven't had success. The following C++ and Fortran snippets
> | compile properly separately—the C++ as part of Rcpp and the Fortran
> | using R CMD SHLIB and dynload—and the R snippets call them properly,
> | but when I put both the .cpp and .f95 files in /src, I get the huge
> | error posted below the files.
> |
> | Am I missing something simple or will having C++ and Fortran code in
> | the same package prevent the use of Rcpp and require the old methods
> | of calling compiled code?
>
> I was about to say 'sure, why not' when I remembered that Writiing R
> Extension has something to say about this in section 1.2.4:
>
>      There is no guarantee that C++11 can be used in a package in
>   combination with any other compiled language (even C), as the C++11
>   compiler may be incompatible with the native compilers for the platform.
>   (There are known problems mixing C++11 with Fortran.)
>
> but then this warning is just about C++11 and Fortran.
>
> That said, your description above suggests that you are "simply" too
> optimistic about 'Rcpp Attributes' -- those do not aim to support all
> languages. They provide a (very powerful) convenience tool for Rcpp. And
> hence C++.
>
> If it works in a package, stick with a package. That gets you different
> compilation units, and hopefully sane linking.
>
> Dirk
>
> --
> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
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