f2py parser fails on a Fortran function with C binding #9693

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1. dhermes

   changed the title [-]f2py parser fails when a Fortran function with C binding[/-] [+]f2py parser fails on a Fortran function with C binding[/+] on Sep 15, 2017
2. kprussing commented on Dec 17, 2017

   

   kprussing

   on Dec 17, 2017

   Last edited by kprussing

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   This is in part due to the fact that the bind(c) attribute is part of the Fortran 2003 standard and the snippet is not valid Fortran 2003. The function must be in a module that uses the iso_c_binding module. A valid minimum failing example would be:

   module mfe
       use iso_c_binding
       implicit none
   contains
       function wat(x, y) result(z) bind(c, name='wat')
           integer(c_int), intent(in) :: x, y
           integer(c_int) :: z
       
           z = x + 7
       end function wat
   end module mfe
   

   This compiles happily with gfortran on macOS 10.12.6 However, this still throw an assertion error with NumPy 1.13.3

   AssertionError: (1, "x, y@)@ result@(@z@)@ bind@(@c, name='wat'", "x@,@ y@)@ result@(@z@)@ bind@(@c, name='wat'", ')')
   

   I get the same error in both Python 3.6 and 2.7 installed from MacPorts. I cloned the repo and managed to build tags v1.6.0 and v1.7.0 against the native Python (2.7), but I still get the error.

   So, is this a user error trying to parse the source using f2py.crackfortran.crackfortran or a parer error as referenced in the closed issue? Are there any other tags where this was to have been fixed?

   Update: Fixed the attributes to properly declare the types of the arguments.
3. eric-wieser

   added

   component: numpy.f2py

   on Dec 18, 2017
4. HaoZeke

   self-assigned this

   on Aug 25, 2021
5. charris

   closed this as completedin #24555on Sep 2, 2023
6. github-project-automation

   added this to f2py coreon Aug 26, 2024
7. github-project-automation

   moved this to Done in f2py coreon Aug 26, 2024