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:
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. 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
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