intel fortran building problem with calling c function (window)

[simsim0]

Hi, I'm testing a mixed programming (fortran main and calling c function).

The fortran file (a.f) is as follows.

program test
external ddd
call ddd(5,iii)
write(*,*) iii
end

The c file (b.c) is as follows.

#include  <io.h>

void  ddd_(int *i,int *j){

*j=*i;

}

Then,  compiling and building was performed on the "intel oneAPI command prompt for IA32 for visual studio 2022" as follows.

D:\code\test>cl -c b.c

D:\code\test>ifort -c a.f

D:\code\test>ifort b.obj a.obj

But, linking error (LNK2019) occurred as follows.

a.obj: error LNK2019: _DDD_MAIN__....

Could you help about the linking problem?

[jimdempseyatthecove]

The use of external is being phased out for C interoperability. Use BIND(C)
Jim Dempsey

[simsim0 · Accepted solution]

thanks.