[R] first steps to build a FORTRAN DLL used by R

MAURICE Jean - externe jean-externe.maurice at edf.fr
Wed Feb 24 10:41:07 CET 2016

I am a fortran developper, freelance, hired by a huge company to transform R calculations to FORTRAN. I am discovering R.

Few years ago someone built FORTRAN dll using Lahey Fortran (perhaps only to test his programs) and gfortran. I found two .bat files, one for Lahey :
ECHO compilation fortran LAHEY regression\regr.f
lf95 -dll -ml msvc regr.f >regr.txt
type regr.txt

and one for gfortran :
ECHO creation DLL FORTRAN par R regression\regr.f
C:\utilitaires\R\R-3.1.0\bin\i386\rcmd SHLIB regr.f >creationdllr.txt
TYPE creationdllr.txt

Creationdllr.txt being :
gfortran -m32     -O3  -mtune=core2 -c regr.f -o regr.o
gcc -m32 -shared -s -static-libgcc -o regr.dll tmp.def regr.o -Ld:/RCompile/CRANpkg/extralibs64/local/lib/i386 -Ld:/RCompile/CRANpkg/extralibs64/local/lib -lgfortran -LC:/utilitaires/R/R-3.1.0/bin/i386 -lR

Nowadays, the company uses Intel's FORTRAN. I could build a dll with it but R doesn't want to load it ! parameters are : 'keep fortran 77 compatibility' and 'console mode'.

What I would like to know are 'the first steps' or 'building FORTRAN dll's for beginners (dummy ?)' :

1)      Can we use Intel's Fortran or must we use gfortran

2)      If we must use gfortran is it given with R ?

3)      If we can use Intel's Fortran, what are the parameters to use and has someone recommandations to give ?

Thanks in advance for your help
Jean MAURICE in France
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