From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12615 invoked by alias); 12 Oct 2010 23:00:44 -0000 Received: (qmail 12607 invoked by uid 22791); 12 Oct 2010 23:00:44 -0000 X-SWARE-Spam-Status: No, hits=-6.2 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 12 Oct 2010 23:00:39 +0000 Received: from int-mx03.intmail.prod.int.phx2.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.16]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o9CN0CKx011141 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 12 Oct 2010 19:00:12 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx03.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o9CN0BP4031504; Tue, 12 Oct 2010 19:00:11 -0400 Received: from opsy.redhat.com (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id o9CN04k8005631; Tue, 12 Oct 2010 19:00:08 -0400 Received: by opsy.redhat.com (Postfix, from userid 500) id 610193780FB; Tue, 12 Oct 2010 17:00:04 -0600 (MDT) From: Tom Tromey To: Ken Werner Cc: Joel Brobecker , Daniel Jacobowitz , Ulrich Weigand , gdb-patches@sourceware.org Subject: Re: [patch] fix pre-/post- in-/decrement References: <201010041301.o94D1QHV032611@d12av02.megacenter.de.ibm.com> <201010042146.50252.ken@linux.vnet.ibm.com> <201010071438.00571.ken@linux.vnet.ibm.com> Date: Tue, 12 Oct 2010 23:00:00 -0000 In-Reply-To: <201010071438.00571.ken@linux.vnet.ibm.com> (Ken Werner's message of "Thu, 7 Oct 2010 14:38:00 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2010-10/txt/msg00211.txt.bz2 >>>>> "Ken" == Ken Werner writes: Ken> I overlooked that in case of C++ the various assignment, Ken> pre-increment and pre-decrement operators return lvalues while they Ken> return non-lvalues for C. I still had this patch in my queue, but I wasn't sure if it was obsoleted by something else... While I don't really mind having language checks in the expression evaluator, it seems like this particular error condition is something that could be detected in the C parser. Also, I think the C++ rule is more complicated. I did not look through the standard to find it, but g++ at least gives an error for a simple scalar "x++ = 5". Tom