From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-30021-listarch-gdb=sources.redhat.com@sourceware.org>
Received: (qmail 26931 invoked by alias); 25 Oct 2007 19:27:29 -0000
Received: (qmail 26915 invoked by uid 22791); 25 Oct 2007 19:27:29 -0000
X-Spam-Check-By: sourceware.org
Received: from mail.codesourcery.com (HELO mail.codesourcery.com) (65.74.133.4)     by sourceware.org (qpsmtpd/0.31) with ESMTP; Thu, 25 Oct 2007 19:27:27 +0000
Received: (qmail 19696 invoked from network); 25 Oct 2007 19:27:25 -0000
Received: from unknown (HELO localhost) (jimb@127.0.0.2)   by mail.codesourcery.com with ESMTPA; 25 Oct 2007 19:27:25 -0000
To: gdb@sourceware.org
Subject: Re: Problems while debugging fortran
References: <19c433eb0710250906k392cecf8t1f99595d5c5a8107@mail.gmail.com> 	<20071025170621.GA27275@caradoc.them.org> 	<m3lk9rxceq.fsf@codesourcery.com> 	<20071025190150.GA1560@caradoc.them.org>
From: Jim Blandy <jimb@codesourcery.com>
Date: Thu, 25 Oct 2007 19:27:00 -0000
In-Reply-To: <20071025190150.GA1560@caradoc.them.org> (Daniel Jacobowitz's message of "Thu, 25 Oct 2007 15:01:50 -0400")
Message-ID: <m3tzof9eqq.fsf@codesourcery.com>
User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-IsSubscribed: yes
Mailing-List: contact gdb-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb.sourceware.org>
List-Subscribe: <mailto:gdb-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb/>
List-Post: <mailto:gdb@sourceware.org>
List-Help: <mailto:gdb-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-owner@sourceware.org
X-SW-Source: 2007-10/txt/msg00241.txt.bz2


Here's a revised comment that may explain what's going on better:

  /* DWARF doesn't provide a way to identify a program's source-level
     entry point.  DW_AT_calling_convention attributes are only meant
     to describe functions' calling conventions.

     However, because it's a necessary piece of information in
     Fortran, and because DW_CC_program is the only piece of debugging
     information whose definition refers to a 'main program' at all,
     several compilers have begun marking Fortran main programs with
     DW_CC_program --- even when those functions use the standard
     calling conventions.

     So until DWARF specifies a way to provide this information and
     compilers pick up the new representation, we'll support this
     practice.  */