Path: utzoo!mnetor!uunet!husc6!rutgers!ames!necntc!linus!rr
From: rr@linus.UUCP (Robert Rifkin)
Newsgroups: comp.lang.c
Subject: linking with Fortran subroutines
Message-ID: <20615@linus.UUCP>
Date: 28 Dec 87 13:41:41 GMT
Reply-To: rr@linus.UUCP (Robert Rifkin)
Distribution: na
Organization: The MITRE Corporation, Bedford MA
Lines: 27

I am trying to link C code with some canned Fortran routines
(the NAG math library) on a Unix-based system. 
I understand that Fortran subroutines
pass arguments by address, so the calling C code must use
addresses to be compatible.  However, one snag that I still have
is that the Fortran routine passes a function name through the
subroutine call e.g.
       external function
       .
       .
       call x (function, a,b,c...)
where "function" is the function , and a,b,and c are variables.
I believe that what Fortran does is that "function" passes the address
of where the actual function begins.  
   I've tried C-code calls like
     double precision *functioin( );
     .
     .
     x_(function, &a,&b,&c);
to no avail.  Does anyone have any suggestions for solving this
problem?


-- 
    Robert Rifkin               Phone: (617) 271-2302
    The MITRE Corporation       ARPA: linus!rr@MITRE-BEDFORD
    Bedford, MA  01730		UUCP: decvax!linus!rr