how to force preprocessing of *.f90 files (i.e., not *.F90)

[Dimitri Komatitsch]

Dear all,

Is there a way of forcing preprocessing in gfortran
when the files are named *.f90 rather than *.F90 ?
I maintain a package in which all files are called *.f90 but contain
#define directives. With other compilers (for instance Intel ifort)
we force preprocessing by adding the "-cpp " option, is there something
equivalent in gfortran? if not, it could be a good idea to add it.

(I checked the manual and did not find such an option, I hope I did not 
miss it...)

Thank you,
Best regards,

Dimitri Komatitsch.

-- 
Dimitri Komatitsch - dimitri.komatitsch aT univ-pau.fr
Professor of Geophysics, University of Pau, France
http://www.univ-pau.fr/~dkomati1