[CMake] Issue with Fortran/C binding with Intel compilers

[Joachim Pouderoux]

Alan,

Thanks for the advice, I think you are absolutely right, we should update
to Fortran2003 to allow use of iso_c_binding module.
Anyway I have actually been able to make CMake FortranCInterface work using
a more recent version of CMake.

Best,
Joachim


*Joachim Pouderoux*, PhD

*Technical Expert - Scientific Computing Team*
*Kitware SAS <http://www.kitware.fr>*


2016-11-17 15:21 GMT-04:00 Alan W. Irwin <irwin at beluga.phys.uvic.ca>:

> On 2016-11-17 11:12-0400 Joachim Pouderoux wrote:
>
> Unfortunately I can't (Fortran95 only), that's why CMake feature is
>> important.
>>
>
> Hi Joachim:
>
> I have helped convert two projects (PLplot and the ephcom subproject
> of timeephem) recently to use the iso_c_binding module provided by
> Fortran 2003, and that approach (at least for providing a Fortran
> binding to a C library since we have had no need for a C binding to a
> Fortran library) is absolutely great and works fine with fairly recent
> versions of the Intel compiler, the gfortran compiler, and likely most
> importantly from our point of view, the NAG compiler (which advertises
> itself as being the Fortran compiler that is most demanding concerning
> compliance with Fortran standards).
>
> So my advice is to go ahead and at least experimentally provide the
> option of using the iso_c_binding module to future-proof your work,
> and once that new interfacing works I would push (assuming Fortran95
> only is a committee decision) to make an exception for at least the
> iso_c_binding module so you don't have to maintain some home-brew
> C/fortran interface forever.
>
> From my recent very positive experience with the iso_c_binding module,
> the only reason not to go with that module for C/Fortran interfacing
> needs is if if it doesn't work for those needs (which is not my
> experience for a Fortran binding to a C API in the PLplot case with a
> large variety of types of C calls including callbacks) or if there is
> a Fortran compiler out there that does not support it.  I haven't
> found such a compiler yet, but my search has only involved the 3
> compilers referred to above so obviously has not been exhaustive. Is
> there some Fortran compiler you are aware of (aside from really old
> versions of any of them) that does not provide a working iso_c_binding
> module?  And if such a beast exists that does not even support this
> important part of Fortran 2003, do you want to cater to this beast
> indefinitely?  After all, 2003 is quite a few years ago so if a compiler
> doesn't support that, it is almost by definition unsupported.
>
> Alan
> __________________________
> Alan W. Irwin
>
> Astronomical research affiliation with Department of Physics and Astronomy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the FreeEOS equation-of-state
> implementation for stellar interiors (freeeos.sf.net); the Time
> Ephemerides project (timeephem.sf.net); PLplot scientific plotting
> software package (plplot.sf.net); the libLASi project
> (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
> and the Linux Brochure Project (lbproject.sf.net).
> __________________________
>
> Linux-powered Science
> __________________________
>
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