Re: how do you send a fortran character string from GCC to GFortran ?

On 1/2/2025 4:06 AM, Thomas Koenig wrote:

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.

BTW, I have thousands of calls from my Fortran code to my C code. Adding all of the ISO C binding syntax will take a lot of time.  And breakage of what was working code using the Watcom Fortran and C compilers.
Lynn