I stand corrected. Please, by all means, do what you like and drop F77 or whatever you want. Jeff <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Wed, Jan 27, 2021 at 3:35 PM Jeff Hammond via discuss <[email protected]> wrote:

Everybody wishing to have a serious opinion on ISO Fortran 77 should read the following:

https://stevelionel.com/drfortran/2020/05/16/doctor-fortran-in-military-stre...

Also, Squyres is right about everything, as usual.

Jeff

On Wed, Jan 27, 2021 at 7:09 AM Jeff Squyres (jsquyres) via discuss < [email protected]> wrote:

...

On Jan 27, 2021, at 9:45 AM, Raffenetti, Kenneth J. via discuss < [email protected]> wrote:

...

The MPICH team is asking if it would be OK to drop support for building

MPICH with an F77 only compiler.

MPI -- MPICH, Open MPI, etc. -- has never been able to be built with a F77-only compiler because the MPI standard has never adhered to the Fortran 77 standard.

Additionally, MPI-3.1 17.1.1 quite clearly states that a conformant MPI-3.1 implementation must support either the mpi_f08 module (which implies support for much of the Fortran'08 standard) and/or mpif.h + the mpi module (which requires elements of the Fortran 90 standard). This requirement has been there since MPI-3.0, published in 2012.

Hence, it has not been possible to build any conformant MPI implementation with a "F77-only" compiler for nearly a decade.

And let's not forget that Fortran 77 limits symbols -- variables, subroutines, and functions -- to 6 characters. Hence, it has *never* been possible to build any MPI implementation or application with a Fortran 77-only compiler.

Håkon's answer earlier in the thread was also quite correct: "fixed form Fortran" is not the same thing as "Fortran 77". Please stop conflating the two.

...

MPICH will still support all standard Fortran language bindings: mpif.h, use mpi, and use mpi_f08. Does the code you speak of not build with modern Fortran compilers? If so, that is the kind of feedback we are looking for.

That is a good question, much better formed than the original. It's a question that the entire MPI Forum would benefit hearing answers to!

-- Jeff Squyres [email protected]

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-- Jeff Hammond [email protected] http://jeffhammond.github.io/ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss