Fast connection between fortran 77 and 90

[querky]

Hi!

I'm having kind of a "little" problem. I got an old program written in Fortran77 and I want to implement some functionality from Fortran90 routines. The routines are quite long, so I'm not able to rewrite them in F77...

Is there a possibility to connect the routines so that they can communicate (exchange variable values) in a fast way.

I have though about the COMMON Blocks of F77 and the MODULE Statements in F90. Is there a way of connecting these data structures in a way, that a F90 program can read a F77 COMMON Block. (I though about a I/O-interface but I think this is too slow)

Thanks for your help!

 

[eys_physics]

Hey

The connection between Fortran 77 and Fortran 90 is in my opinion a bit tricky. I have myself succeeded to call Fortran 77 subroutines from Fortran 95 (I assume it works in Fortran 90 also) by using the 'call' statement. I have not succeed to call the Fortran 77 functions but I had to rewrite them as subroutines instead. I don't think it is possible to call Fortran 90 code from Fortran 77. To compile the code I think you need a compiler which is able to compile both Fortran 77 and Fortran 90 code, e.g. gfortran
I hope this helps