F90-related question

[Paul Bignier]

Hello,

I have a question about an old compilation line. It used to be " f90 +r8 
-c -O3 *.f  ", and now I would like to use gfortran instead of f90.

The question is only about the "+r8" option. I cannot find an equivalent 
to it so I assume it is defaulted in gfortran, but I would like a 
confirmation for that. My program compiles smoothly with "  gfortran -c 
-O3 *.f  ", but I am not certain of my "new results".

I found -autodbl or -autodouble but they are not recognized by gfortran. 
I use Ubuntu 12.04 and got gfortran through Synaptic.

Thanks for any help I could get.
Have a good day,
Paul