From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 40464 invoked by alias); 25 Jan 2017 14:44:04 -0000 Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org Received: (qmail 40439 invoked by uid 89); 25 Jan 2017 14:44:03 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-5.1 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=UD:msg00023.html, 17-01-25, assembly!, msg00023html X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 25 Jan 2017 14:43:53 +0000 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7E385C05678D; Wed, 25 Jan 2017 14:43:53 +0000 (UTC) Received: from [127.0.0.1] (ovpn04.gateway.prod.ext.phx2.redhat.com [10.5.9.4]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v0PEhlZO013023; Wed, 25 Jan 2017 09:43:52 -0500 Subject: Re: Issue with Latest GDB on AIX with GCC-6.12 To: Yao Qi References: <12a05075-3783-9d3f-1d3c-81931ea91f47@redhat.com> <20170125143729.GU28060@E107787-LIN> Cc: Nitish Kumar Mishra , gdb@sourceware.org From: Pedro Alves Message-ID: <3cad53b0-7a12-7f03-fa9a-57b9e2f680ef@redhat.com> Date: Wed, 25 Jan 2017 14:44:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <20170125143729.GU28060@E107787-LIN> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-SW-Source: 2017-01/txt/msg00049.txt.bz2 On 01/25/2017 02:37 PM, Yao Qi wrote: > On 17-01-25 13:52:49, Pedro Alves wrote: >> >> So I'm out of ideas. It looks like a toolchain/runtime bug >> to me. >> > > Hi Pedro, > GDB on AIX (at least gcc119) is broken since Nov 2016 at least. > https://sourceware.org/ml/gdb/2016-11/msg00023.html > > I tried to debug libgcc on exception unwinding (in assembly!). I > have a vague memory that unwinder stops unwinding after one or two > frames. I suspect either gcc generate wrong .eh_frame or libgcc > is buggy. That is where I stopped. > Ah, I recalled some previous discussion, but somehow got confused and thought that it had been fixed at the time, and then thought this could have been a regression due to the more recent noexcept addition. Oh well. Thanks, Pedro Alves