From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Andreas Schwab Newsgroups: gmane.emacs.devel Subject: Re: resolving ambiguity in action stamps Date: Sat, 13 Sep 2014 10:51:05 +0200 Message-ID: <87d2az7vk6.fsf@igel.home> References: <20140912043652.4D6D8380604@snark.thyrsus.com> <83zje56ymd.fsf@gnu.org> <20140912083430.GA32586@thyrsus.com> <87mwa59i1r.fsf@igel.home> <20140912115739.GA3403@thyrsus.com> <87d2b19cbr.fsf@igel.home> <20140912155410.GA5086@thyrsus.com> <877g188uc3.fsf_-_@slice.rozzin.com> <20140912204111.GA12328@thyrsus.com> <87wq9841zx.fsf@uwakimon.sk.tsukuba.ac.jp> <20140913053525.GA15582@thyrsus.com> <87tx4c3t4k.fsf@uwakimon.sk.tsukuba.ac.jp> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1410598303 27758 80.91.229.3 (13 Sep 2014 08:51:43 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 13 Sep 2014 08:51:43 +0000 (UTC) Cc: esr@thyrsus.com, emacs-devel@gnu.org To: "Stephen J. Turnbull" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Sep 13 10:51:35 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XSj3M-0001yW-SI for ged-emacs-devel@m.gmane.org; Sat, 13 Sep 2014 10:51:32 +0200 Original-Received: from localhost ([::1]:48980 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSj3M-0006IB-I1 for ged-emacs-devel@m.gmane.org; Sat, 13 Sep 2014 04:51:32 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41894) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSj35-0006Au-8U for emacs-devel@gnu.org; Sat, 13 Sep 2014 04:51:20 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XSj2z-0005wG-SU for emacs-devel@gnu.org; Sat, 13 Sep 2014 04:51:15 -0400 Original-Received: from mail-out.m-online.net ([212.18.0.9]:53538) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XSj2z-0005w7-MF for emacs-devel@gnu.org; Sat, 13 Sep 2014 04:51:09 -0400 Original-Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3hw6xl3th5z3hj2w; Sat, 13 Sep 2014 10:51:07 +0200 (CEST) Original-Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3hw6xl2RyXzvhRv; Sat, 13 Sep 2014 10:51:07 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Original-Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id ZWNvKpi3z2F7; Sat, 13 Sep 2014 10:51:05 +0200 (CEST) X-Auth-Info: BeQWTqMqGJ7YSbluBYk3OvOgUjhhRghnb/EBcLh/VLWJ3mthp2c1o2wn4N7XgePS Original-Received: from igel.home (host-188-174-221-229.customer.m-online.net [188.174.221.229]) by mail.mnet-online.de (Postfix) with ESMTPA; Sat, 13 Sep 2014 10:51:05 +0200 (CEST) Original-Received: by igel.home (Postfix, from userid 1000) id 65AF92C2593; Sat, 13 Sep 2014 10:51:05 +0200 (CEST) X-Yow: Civilization is fun! Anyway, it keeps me busy!! In-Reply-To: <87tx4c3t4k.fsf@uwakimon.sk.tsukuba.ac.jp> (Stephen J. Turnbull's message of "Sat, 13 Sep 2014 15:57:15 +0900") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.93 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 212.18.0.9 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:174266 Archived-At: "Stephen J. Turnbull" writes: > Eric S. Raymond writes: > > > The problem case is this: > > > > A <-- B <-- C <-- B <-- D > > \ > > +--- B <-- E <- F > > > > In this the minimal subgraph joining the clique is not totally ordered, > > so we don't know how to uniquely order the Bs on the branches. > > > > To solve this problem we need a unique order relation on the branch heads. > > The branch heads *have* canonical names: the SHA1 of the commit. The hash of the head doesn't define a unique order on the branches. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."