[CMake] Fortran to C mapping module

[Bill Hoffman]

I have just checked in a module to help with the linking of Fortran from 
C.   I would appreciate some feedback, and perhaps some testing with 
different Fortran compilers.  Does anyone know of a web site that lists 
different Fortran compiler name mangling schemes?

The module is here: Modules/FortranCInterface.cmake

You use it like this:

project(test C Fortran)
cmake_minimum_required(VERSION 2.7)
include(FortranCInterface)
# the : is used for subroutines that are in a Fortran module
set(FORTRAN_FUNCTIONS mysub test_mod:sub)
create_fortran_c_interface("F_" FORTRAN_FUNCTIONS 
"${test_BINARY_DIR}/foo.h")

include_directories("${test_BINARY_DIR}")
add_executable(foo foo.c foo.f mysub.f)


-----foo.c------
#include "foo.h"
extern F_test_mod_sub();
extern F_mysub();
int main()
{
  F_mysub();
  F_test_mod_sub();
}

----mysub.f-----
      subroutine mysub
      end subroutine

---- foo.f -----
      module test_mod
      interface dummy
         module procedure sub
      end interface
      contains
        subroutine sub
        end subroutine

      end module test_mod


---- example generated foo.h for gcc/gfortran-----

#define F_mysub mysub_

#define F_test_mod_sub __test_mod_MOD_sub


Thanks.

-Bill
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