f2py - call fortran subroutine which use another module

Question

I have these files:

$ ls
test.f90 module_file.f90

and module_file.f90 defines a module:

! module_file.f90
module test_mod
    implicit none
    ....
contains
    subroutine sub_in_module()
        ....
    end subroutine sub_in_module
end module test_mod

Then module_file.f90 is compiled by gfortran -c module_file.f90, generates module_file.o and test_mod.mod.

The subroutine in test.f90 will call the sub_in_module:

! test.f90
subroutine sub()
    use test_mod
    implicit none
    write(*,*) "calling sub_in_module in sub..."
    call sub_in_module()
    return
end subroutine sub

Then I want to call sub in python, so I use f2py:

$ f2py -c test.f90 -m f90test

and successfully generate f90test.cpython-36m-x86_64-linux-gnu.so.
But it can not work well,

$ python
>>> import f90test
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /mypath/f90test.cpython-36m-x86_64-linux-gnu.so: undefined symbol: __test_mod_MOD_sub_in_module
>>>

I guess that it doesn't link to the module_file.o, but I have no idea how to solve this problem.
Any suggestion is helpful, thanks!

---------update---------
I successfully compile these files by following this.
Here is the procedure:

$ gfortran -c module_file.f90 -fPIC
$ f2py -c -I. module_file.o -m f90test test.f90
$ python
>>> import f90test   # it works !
>>>

f2py - call fortran subroutine which use another module

0 Answers0