Troubles on linking C++ with Fortran at VS 2005

[grspinto]

Hi there,

I am not very used to programming and I am trying to call a Fortran function/subroutine with a C++ main program, but it haven't worked.
Untill now, I've been trying to build the easiest program possible, such as c++ calling a c = a + b fortran function. I am trying this on a VS 2005 c++ along with an Intel Visual Fortran.
I have been looking for some answers on this forum and I've made these routines:

c++--------
#include <stdio.h>
extern "C" {int fort(int*, int*);}
int main ()
{
int a, b, c;
a = 2;
b = 3;
c = fort(&a,&b);
return c;
}
---- end c++
fortran --------
INTEGER FUNCTION FORT (A,B)
!DEC$ ATTRIBUTES DLLEXPORT :: FORT
!DEC$ ATTRIBUTES ALIAS :'FORT' :: FORT
!DEC$ ATTRIBUTES REFERENCE :: A,B

IMPLICIT NONE
INTEGER, INTENT (IN) :: A,B
FORT = A + B
END FUNCTION FORT
----end fortran

They both compile without problems, but the linking step breaks on an LNK2019 error: unresolved external symbol _fort referenced in function _main.

I woud really appreciate if one could help.

Thanks a lot,
grspinto

[JosAH]

Either make that function name FORT in your C code or make it fort in your Fortran code; both C and the linker are case sensitive. If that doesn't work try prepending an underscore _ in front of the Fortran name as well.

kind regards,

Jos

[grspinto]

Dear Jos,

Thank you very much. I followed your both advices and the program worked pretty well.

Best regards,
grspinto

[fernandodb]

What settings must be set for the c++ program to compile? Includes?