Using Fortran 90 code in packages for CRAN

Everything you need to know is in the Writing R Extensions manual, and
section 1.2.3 in particular. There are restrictions on Fortran 90/95 use
due to portability issues.

Make sure you are following all of the advice in the manual, e.g.:
- Files containing Fortran 90 code should have extension .f90
- Mixed Fortran 9x and C++ code is not supported and there is no
  guarantee that Fortran 9x can be mixed with other languages.
- Free source form Fortran 9x is not portable.
- When using modules, you may need to give compile-order hints to 
  parallel make.
- Do not include module files in the source - they are
  compiler-dependent.

Martyn

I recently submitted a package to CRAN which encompasses Fortran 90 code. 
Neither on my linux system nor on the win-builder system the compilation 
reported any error or warning. The function worked fine. However, after 
submission of the package to CRAN, I received an email that I should not 
include Fortran 90 code. 

The problem is that the part written in Fortran is a large function using 
modules. Thus, rewriting the function in FORTRAN 77 is  impossible. So, I 
searched on CRAN and found some packages which contain Fortran 90 code. Is it 
generally possible to submit R packages to CRAN containing Fortran 90 source 
code? If so, what specific things should I consider?

Thank you for your help 

Lukas Lehnert

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