//////////////// mylib.dpr ///////////////
library mylib;

uses myfunctions;

exports
  foo;

end.


/////////////// myfunctions.pas ////////////////
unit myfunctions;

interface

function foo(bar: integer): integer; stdcall;

implementation

function foo(bar: integer): integer; stdcall;
begin
  if bar <> 0 then
    result := foo(bar - bar div 2)
  else
    result := bar;
end;

end.