[Rd] R problems with lapack with gfortran

[Steve Kargl]

On Sat, May 04, 2019 at 06:42:47PM +0200, Thomas König wrote:
> 
> > - figure out Fortran2003 specification for C/Fortran interoperability
> > -- this _sounds_ like the right solution, but I don't think many
> > understand how to use it and what is implied (in particular, will
> > it require making changes to LAPACK itself?)
> 
> That would actually be fairly easy.  If you declare the subroutines
> BIND(C), as in
> 
>        subroutine foo(a,b) BIND(C,name="foo_")
>        real a
>        character*1 b
>        end
> 
> you will get the calling signature that you already have in your C
> sources.
> 
> This also has the advantage of being standards compliant, and would be
> probably be the preferred method.
> 

With the caveat that one may need to use the VALUE attribute to
account for pass-by-value vs pass-by-reference.

-- 
Steve