Integrating Fortran code in Julia -

i using gnu gfortran compiler (on cygwin) own module. example start compilation stage, address mangled names , call subroutine julia via ccall. examples i've seen skip first 2 stages.

so imagine have following module in fortran 90 file named 'f90tojl.f90':

module m contains     integer function five()       5 = 5     end function 5 end module m 

this example here. compile gfortran follows create shared library:

gfortran -shared -o2 f90tojl.f90 -o -fpic f90tojl.so 

and my, admittedly shaky, understanding reading julia docs suggest should able call function 5 so:

ccall( (:__m_mod_five, "f90tojl"), int, () ) 

it didn't work me. 'error compiling anonymous: not load module f90tojl.... cares enlighten me? got sneaky sense i'm doing silly....

in official doc, emphasis on c. i'm aware of this c++. in r , python, momentum -- have cython , rcpp in mind -- seems c/c++. similar question, want sense of how easy interface julia fortran vs julia c/c++.

calling fortran , c same, documentation says. there far fewer examples because there far less code people want wrap, suppose. wrapping c super easy in julia, pleasant. not typically done speeding julia, r or python, more take advantage of quality code written.

julia's standard library great example of integrating fortran code, e.g. here julia wrapper arpark. outside of base, glmnet written in fortran, , there julia wrapper (glmnet.jl).

i don't see how modern fortran distinction matters.