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From: Thomas Koenig <tkoenig@netcologne.de>
Newsgroups: comp.lang.fortran
Subject: Re: how do you send a fortran character string from GCC to GFortran ?
Date: Thu, 2 Jan 2025 10:06:59 -0000 (UTC)
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Lynn McGuire <lynnmcguire5@gmail.com> schrieb:
> How do you send a fortran character string from GCC to GFortran ?
>
> I cannot get this to link.  I can do the reverse, send a fortran 
> character string from Gfortran to GCC.

A full, self-contained example would be helpful for somebody trying to
help (especially since you say "link", which seems weird).

But take a look at

https://gcc.gnu.org/onlinedocs/gfortran/Naming-and-argument-passing-conventions.html

> I do have the additional complication that I do not know the length of 
> the fortran character string being sent from GCC to Gfortran at compile 
> time, only run time.  So that is a character*(*) string.
>
> I am not using the ISO C binding.

It is generally a good idea to use ISO C binding in new code, it
is what it was introduced for.

But you might also find

https://gcc.gnu.org/onlinedocs/gfortran/Interoperability-Options.html

of interest.