From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 58228 invoked by alias); 7 Oct 2015 07:45:47 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 58211 invoked by uid 89); 7 Oct 2015 07:45:45 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.3 required=5.0 tests=AWL,BAYES_20,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 X-HELO: mail-wi0-f173.google.com Received: from mail-wi0-f173.google.com (HELO mail-wi0-f173.google.com) (209.85.212.173) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Wed, 07 Oct 2015 07:45:44 +0000 Received: by wicgb1 with SMTP id gb1so198278673wic.1 for ; Wed, 07 Oct 2015 00:45:41 -0700 (PDT) MIME-Version: 1.0 X-Received: by 10.194.221.4 with SMTP id qa4mr44935410wjc.145.1444203941631; Wed, 07 Oct 2015 00:45:41 -0700 (PDT) Received: by 10.194.28.230 with HTTP; Wed, 7 Oct 2015 00:45:41 -0700 (PDT) In-Reply-To: <56144739.7040602@tiscali.co.uk> References: <560BC46D.3060500@gmail.com> <560C0863.70505@tiscali.co.uk> <560C6369.7060602@gmail.com> <560C71FB.4030005@tiscali.co.uk> <560D2F6D.90608@gmail.com> <5613F632.1080205@t-online.de> <56140A2F.3000004@cornell.edu> <56144739.7040602@tiscali.co.uk> Date: Wed, 07 Oct 2015 07:45:00 -0000 Message-ID: Subject: Re: Updated: gcc-5.2.0-1 (Test x86/x86_64) From: Csaba Raduly To: cygwin list Content-Type: text/plain; charset=UTF-8 X-SW-Source: 2015-10/txt/msg00080.txt.bz2 On Wed, Oct 7, 2015 at 12:12 AM, David Stacey wrote: > > On 06/10/15 18:51, Ken Brown wrote: (snip) >> >> >> What about the following scenario: Package P links against library L. Library L is rebuilt to use the new ABI. Isn't it possible that package P will then have to be rebuilt as well? > > > My understanding is that if 'L' is built with -D_GLIBCXX_USE_CXX11_ABI=0 then P wouldn't need to be rebuilt (I haven't tested that, though). However, this compiler switch loses some C++11 features of the STL, so it isn't a magic cure. > If you use -D_GLIBCXX_USE_CXX11_ABI=0, you're stuck with the COW (the old std::string implementation in libstdc++ which uses copy-on-write; this is not standard-conforming anymore). std::list::size() remains O(n) instead of the newly mandated O(1). AFAIK, that's it. Csaba -- GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++ The Tao of math: The numbers you can count are not the real numbers. Life is complex, with real and imaginary parts. "Ok, it boots. Which means it must be bug-free and perfect. " -- Linus Torvalds "People disagree with me. I just ignore them." -- Linus Torvalds -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple