From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 71104 invoked by alias); 19 Apr 2016 13:35:41 -0000 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 Received: (qmail 71090 invoked by uid 89); 19 Apr 2016 13:35:40 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.9 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=Hx-languages-length:979 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 (AES256-GCM-SHA384 encrypted) ESMTPS; Tue, 19 Apr 2016 13:35:35 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (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 9126B627DA; Tue, 19 Apr 2016 13:35:34 +0000 (UTC) Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u3JDZXxb018895; Tue, 19 Apr 2016 09:35:33 -0400 Subject: Re: [PATCH 1/2] Use -fno-asynchronous-unwind-tables if C program is compiled without debug info on x86 To: Yao Qi , gdb-patches@sourceware.org References: <1461052220-10149-1-git-send-email-yao.qi@linaro.org> <1461052220-10149-2-git-send-email-yao.qi@linaro.org> From: Pedro Alves Message-ID: <57163425.1070505@redhat.com> Date: Tue, 19 Apr 2016 13:35:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 MIME-Version: 1.0 In-Reply-To: <1461052220-10149-2-git-send-email-yao.qi@linaro.org> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-SW-Source: 2016-04/txt/msg00439.txt.bz2 I think the subject would be clearer if it mentioned this is about gdb tests. E.g.: Use -fno-asynchronous-unwind-tables on x86 for gdb C tests without debug info On 04/19/2016 08:50 AM, Yao Qi wrote: > .eh_frame is added in default on x86 and x86_64 so that DWARF unwinder > is always used, but prologue unwinders won't be used at all. IOW, > prologue unwinders are not tested by regression tests. If the test is > intended to compiled *without* debug info, we shouldn't generate any > debug info (.eh_frame for example) at all. > > This patch is to disable async-unwind-tables generation if the C program > is intended to compile without debug info on x86-like target. No sure about this. This is an ABI change on x86_64 -- the x86_64 ABI requires eh_frame. Should we instead add a new "nounwind" option, and a few prologue-unwinder-specific tests? Thanks, Pedro Alves