I have a guess, but I am not really sure. The GUI will try to be
helpful and set a breakpoint on a function called 'main'.
The command line dbx won't try and do this.
if you ignore the error and set a breakpoint yourself, then run the program
does the debugger seem to work as normal?
If you have time, I think the fortran group would be interested in hearing
what your problems were. We have a lot of work still to do on our
linux compilers, so perhaps the problems are already being worked on,
but we won't know unless you report them. (I don't know if you have
already posted your issues in these forums or not, I am just reminding
that it will help us to make forward progress)
--chris