automatic generation of interfaces

[Vivek Rao]

Steve Lionel wrote on comp.lang.fortran,

"The Intel Fortran compiler 
has options "-gen-interface -warn interface" which,
used together, tells the compiler to automatically
generate modules with interfaces for each routine
compiled and then to look for the corresponding 
module when it sees a call to a routine for the
purpose of error checking. This can be quite handy." 

It would be nice to have analogous options for
gfortran. In Fortran 90+ one can put procedures in
modules, but I am sure that gfortran is being used
heavily on Fortran 77 code, too.

(I know lots of things "would be nice", and I am not
volunteering to do it, sorry.)