On Monday, July 6, 2015, Dirk Eddelbuettel <e...@debian.org> wrote: > > On 6 July 2015 at 17:24, Peng Yu wrote: > | BTW, I checked all the packages that depend on Rcpp one way or > | another. All the packages which use FORTRAN only have .f files but not > | .f90 files. Is it an coincident or it is known that R does not support > | .f90 well? > > A _15 second_ search of Writing R Extensions reveals this in Section 1.1.5:
Thanks. I also saw it. > > The sources and headers for the compiled code are in 'src', plus > optionally a file 'Makevars' or 'Makefile'. When a package is installed > using 'R CMD INSTALL', 'make' is used to control compilation and linking > into a shared object for loading into R. There are default 'make' > 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(5), Objective C and Objective C++(6) with > associated extensions '.c', '.cc' or '.cpp', '.f', '.f90' or '.f95', > '.m', and '.mm', respectively. We recommend using '.h' for headers, > also for C++(7) or Fortran 9x include files. (Use of extension '.C' for > C++ is no longer supported.) Files in the 'src' directory should not be > hidden (start with a dot), and hidden files will under some versions of > R be ignored. > > It is not portable (and may not be possible at all) to mix all these > languages in a single package, and we do not support using both C++ and > Fortran 9x. The funny thing of the manual is that actually my package can be compiled on Mac. It is defintitely possible to mix fortran 90 and C++ (at least with some subset features of both). It seems that this is just another problem of R's documention and some idiosyncratic decision made by the R core team members in charge of this aspect. > Because R itself uses it, we know that C and FORTRAN 77 can > be used together and mixing C and C++ seems to be widely successful. > > Note the second paragraph: So f90 and C++ do NOT go together. > > Dirk > > -- > http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org > <javascript:;> > -- Regards, Peng
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