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To: John McNally <mcnally AT tempest DOT engr DOT ucdavis DOT edu>
cc: "gnu-win32 AT cygnus DOT com" <gnu-win32 AT cygnus DOT com>
Subject: Re: jni,egcs1.1.2 compiling problem 
In-reply-to: Your message of "Wed, 21 Apr 1999 19:17:33 PDT."
             <371E86BD DOT 91C757B9 AT tempest DOT engr DOT ucdavis DOT edu> 
Date: Wed, 21 Apr 1999 23:00:02 -0500
From: Mumit Khan <khan AT xraylith DOT wisc DOT EDU>

John McNally <mcnally AT tempest DOT engr DOT ucdavis DOT edu> writes:
> Thank you for all your help.  Your Fortran JNI example worked fine as
> delivered.  However I tried making the fortran function have an integer
> in its argument list.  If the function does nothing with the integer
> passed to it it will return ok.  If the integer is used in the function,
> however, the program crashes.
> 
> This does not appear to be related to JNI, but in calling the Fortran
> routine from C.  I'm sure this sort of thing must have been ironed out
> long ago, so it is probably the way I'm doing it.
> I did try compiling with the -mrtd option.  I'll try some more tomorrow.

Using my example, you don't need, and don't want, -mrtd.

You're right that it's an issue of C to F77 interfacing. Since it's rather
off topic for this list, I suggest you go over to comp.lang.fortran and
ask. Carsten Arnholm has (at least used to a few years ago) a nice
tutorial at http://home.sol.no/~arnholm/ which you want to check.

Just remember that most implementations of f77 pass arguments by
reference, so the following will match:
  
  subroutine f77sub (i)
  integer i

and
  
  int i = 5;
  f77sub_ (&i);

Regards,
Mumit


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