Fortran compile error on different machine

Question

I'm working with a very large piece of mortran code. I'm trying to compile it on my own machine, and the mortran part goes ok, but the fortran compile fails.

On both machines I'm using gfortran with the same flags (-fPIC).

Machine 1:

Linux [omitted] 2.6.18-194.3.1.el5 #1 SMP Fri May 7 01:43:09 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux with gfortran 4.1.2 (Working - very old kernel)

Machine 2:

Linux [omitted] 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux with gfortran 5.4.0 (Not working)

The error (most of the time) I'm getting is:

Error: Invalid character in name at (1)
       ExIN=$ExDEF
            1

There's also a few errors about var has no implicit type.

I don't have much experience with fortran, but I'd expect compilers to be consistent across platforms, especially since this was developed with the intent of being cross-platform.

Edit - it looks like I had a different version of the mortran compiler. I'm going to try to find the old version and see if that does it. They are mortran macros and they are supposed to expand to something.

What kind of Fortran flavors do you use? What are the versions of compiler at both machines? — Oo.oO
Not sure what flavors - I did not write the code, 4.1.2 on the working machine and 5.4.0 on the non-working machine — Brydon Gibson
$ is not allowed in Fortran tokens. The code is not conforming and certainly was NOT "developed with the intent of being cross-platform". Which compiler options do you use? — Vladimir F
Yes, the Makefile builds mortran, and then tries to build fortran. Compiler options are -fPIC and O2 for optimisation — Brydon Gibson

Vladimir F Vladimir F · Accepted Answer · 2017-06-21T18:21:55

Dollar is not a valid character of the Fortran character set.

Some compilers allow it by extension. To allow it in GNU Fortran, but not as first character and only if the target system supports it, use

-fdollar-ok

See https://gcc.gnu.org/onlinedocs/gfortran/Naming-conventions.html

Looks like you are out of luck with this compiler.

You may try g77 with the same option, see https://gcc.gnu.org/onlinedocs/gcc-3.4.5/g77/Dollar-Signs.html

The old gfortran 4.8.1 also does not speak about the initial letter restriction

-fdollar-ok Allow `$' as a valid character in a symbol name.

Fortran compile error on different machine

1 Answers