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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: importing fortran routines to GNAT
Date: 1997/02/21
Message-ID: <dewar.856527391@merv>#1/1
X-Deja-AN: 220403040
References: <330DBC84.219B@msslac.mssl.ucl.ac.uk>
Organization: New York University
Newsgroups: comp.lang.ada
Date: 1997-02-21T00:00:00+00:00
List-Id: <comp.lang.ada>


Pasi asks

<<I'm a sworn FORTRAN-programmer finally trying to learn a more
advanced language (ADA). Now, I still have lots of fortran
subroutines that I want to use, but somehow all the information
on how to do that in GNAT (3.05 I think) doesn't seem to apply
to me... :(
      I've attached two files to this message: amain.adb is a
very simple main program that calls subsum.f (an even more simple
fortran subroutine). Now, HOW CAN I MAKE THE ADA MAIN
PROGRAM TO SEE THE SUBROUTINE???!!!>>


A couple of points. You are using some old version of GNAT but you did
not say on what machine. This is critical information. The current version
of GNAT is 3.10, and the current publically available version is 3.09 (you
mentioned 3.05). This may or may not be relevant to your problem, because
we still don't know what machine you are using.

In any case, this certainly seems like a bug in GNAT, what you wrote looks
perfectly correct. So if this problem persists using the latest version of
GNAT, you should send along a bug report to report@gnat.com. Be sure to
specify what machine you are using and what operating system (there are
many ports of GNAT).

That last request is something that everyone should pay attention to. When
reporting problems with GNAT it is very important to not only give the
version number, but also to state the machine and operating system, since
there are now over 30 versions of GNAT, and though for the most part you
will get identical results, there are cases of bugs which show up only on
one version and not another. Since the problem here is with the naming
of external symbols when done by default, it is clearly system dependent
(you could obviously fix your problem by using a third parameter to
the pragma Import that gave the proper external name, but it shuld be
chosen by default).

Finally, for general questions on GNAT, consider using the gnat chat mailing
list instead of, or at least in addition to, comp.lang.ada. There are many
knowledgable users of GNAT who can sometimes provide useful informal help
for those who do not have support from Ada Core Technologies. TO subscribe
to this list, send a subscribe message to chat-request@gnat.com.