[julia-users] Calling Fortran in Julia Windows 10 - dlopen Error

[Kaela Martin]

I'm trying to get Julia to run a Fortran file on Windows 10, and Julia says 
that it can't open the library. Libdl.dlopen also fails to open the file. 
I've tried adding the current path to LOAD_PATH but still get the same 
error.

For a test case, I'm running the following module:

module hello_module
    use iso_c_binding
    implicit none
contains

    subroutine hello() bind(C,name="hello")
!DEC$ ATTRIBUTES DLLEXPORT :: hello
      write(*,'(A)') "Hello World!!!"
    end subroutine hello

end module hello_module

I'm compiling it in Cygwin64 (I'm on a 64bit Windows 10 machine) using 
gfortran with:

gfortran -shared -o2 -fPIC Hello.f90 -o HelloWorld.dll

I get a warning that -fPIC is ignored, but the file compiles and creates 
HelloWorld.dll

In Julia, I call the library using

ccall((:hello,"HelloWorld.dll"),Void,())

which results in: 

ERROR: could not load library "HelloWorld.dll"
The specified module could not be found.

 in dlopen at libdl.jl:36 (repeats 2 times)
 in dlopen at deprecated.jl:32

Just trying to open the module using Libdl.dlopen("HelloWorld.dll")  gives 
the same error.

Note that I moved the .dll file to a new location after compiling it since 
the goal is to put the code in a single folder that other users can put on 
their windows machines and run.

How do I get Julia to open and run the code?

Thanks,
Kaela