can I make shared library using gfortran?

Question

I would like to make so file in order to use it in python. how can I make shared library from fortran source?

I have tested like below code.

gfortran -c mod.f90
#gfortran -c sub1.f90
gfortran -c func.f90
gfortran -shared -fPIC -o func.so func.f90 mod.o

but I couldn't import it in python. I used module file in fortran source code. and I imported fortran source code from python. I'm not sure if I do right.

[===>14:47:59]f1:python
Python 2.7.2+ (default, Oct  4 2011, 20:03:08) 
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import func
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dynamic module does not define init function (initfunc)




func.f90
-----------------------------------------
program func

use mod_test

switch1 = .true.
switch2 = .false.

x = 1.2
!call test(x, z)
print *, b, str, z, switch1, switch2

!print *, 'hello'
end program func
-----------------------------------------
mod.f90
-----------------------------------------
module mod_test
!implicit none
integer a
real x, y, z
real*8 :: b = 3.4
logical*2 switch1, switch2
character*5, parameter :: str = 'good'
end module mod_test
-----------------------------------------
sub1.f90
-----------------------------------------
subroutine test(input, output)
real, intent(in) :: input
real, intent(out) :: output

output = (input + input)
end subroutine
-----------------------------------------

Answer 1

You need some "glue" between Fortran and Python. Check out F2PY - Fortran to Python interface generator

EDIT. Example:

f2py -c -m func func.f90 mod.f90 sub1.f90
python
>>> import func
>>> dir(func)
['__doc__', '__file__', '__name__', '__version__', 'mod_test', 'test']

EDIT 2. If you want to execute the code in func.f90 from Python, I think you must change it from program to a subroutine.