From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 99288 invoked by alias); 2 Oct 2018 21:26:05 -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 99029 invoked by uid 89); 2 Oct 2018 21:26:04 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-7.4 required=5.0 tests=AWL,BAYES_00,GIT_PATCH_2,RCVD_IN_DNSWL_NONE,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=H*r:35530 X-HELO: gateway23.websitewelcome.com Received: from gateway23.websitewelcome.com (HELO gateway23.websitewelcome.com) (192.185.50.161) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Tue, 02 Oct 2018 21:26:02 +0000 Received: from cm15.websitewelcome.com (cm15.websitewelcome.com [100.42.49.9]) by gateway23.websitewelcome.com (Postfix) with ESMTP id EC4FD12205 for ; Tue, 2 Oct 2018 16:26:00 -0500 (CDT) Received: from box5379.bluehost.com ([162.241.216.53]) by cmsmtp with SMTP id 7SAlgx7628YaU7SAygQ4tX; Tue, 02 Oct 2018 16:25:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tromey.com; s=default; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=ZYNuh/QMacIEjJ2RVnwecPyQS8anO8+bIRfCDfRhfKw=; b=fyRCqh7iWUQWNpCSMmTOsTWYpX m+g4Ps2aG3eueFBvBZfpnepbDZFKCoGrgZ0mPMO4Li0p3cr6GcT43XC5eqqxCuF5SZLxoAB8cCO5X +XAoECt85WySfnz0QNRdCN8sz; Received: from 97-122-190-66.hlrn.qwest.net ([97.122.190.66]:35530 helo=bapiya) by box5379.bluehost.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91) (envelope-from ) id 1g7SAl-003NdA-89; Tue, 02 Oct 2018 16:25:39 -0500 From: Tom Tromey To: Eli Zaretskii Cc: Tom Tromey , gdb-patches@sourceware.org Subject: Re: [PATCH v2 10/10] Add --enable-ubsan References: <20181002044420.17628-1-tom@tromey.com> <20181002044420.17628-11-tom@tromey.com> <83va6k3172.fsf@gnu.org> Date: Tue, 02 Oct 2018 21:26:00 -0000 In-Reply-To: <83va6k3172.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 02 Oct 2018 16:52:49 +0300") Message-ID: <87h8i4ghwt.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-SW-Source: 2018-10/txt/msg00056.txt.bz2 >>>>> "Eli" == Eli Zaretskii writes: >> + Enable or disable the undefined behavior sanitizer. Release >> + versions of gdb disable this by default, but development versions Eli> "GDB", capitalized, I guess? Done. >> +`--enable-ubsan' >> + Enable the GCC undefined behavior sanitizer. By default this is >> + disabled in GDB releases, but enabled when building from git. >> + The undefined behavior sanitizer checks for C++ undefined >> + behavior. It has a performance cost, so if you are looking at >> + GDB's performance, you should disable it. Eli> Does this require some minimal version of g++? If so, I think we Eli> should mention that. And what about testing for this support at Eli> configure time? It was in GCC 4.9. It is tested at configure time. I've updated the text & will send a new patch. >> +# ac_fn_cxx_try_link LINENO >> +# ------------------------- [..] Eli> Is this hunk related to the issue at hand? Yes, I think it's part of configure expansion of the new test. Tom