From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.help Subject: Re: How to find when a feature was introduced Date: Fri, 08 Jul 2016 09:43:00 +0300 Message-ID: <831t34k4uj.fsf@gnu.org> References: NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1467960248 4380 80.91.229.3 (8 Jul 2016 06:44:08 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 8 Jul 2016 06:44:08 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Fri Jul 08 08:44:03 2016 Return-path: Envelope-to: geh-help-gnu-emacs@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 1bLPW6-0005yK-W9 for geh-help-gnu-emacs@m.gmane.org; Fri, 08 Jul 2016 08:44:03 +0200 Original-Received: from localhost ([::1]:43910 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLPW6-0007u0-04 for geh-help-gnu-emacs@m.gmane.org; Fri, 08 Jul 2016 02:44:02 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:44373) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLPVM-0007s4-Ow for help-gnu-emacs@gnu.org; Fri, 08 Jul 2016 02:43:17 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bLPVI-00032w-MN for help-gnu-emacs@gnu.org; Fri, 08 Jul 2016 02:43:15 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:41102) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLPVI-00032n-Iv for help-gnu-emacs@gnu.org; Fri, 08 Jul 2016 02:43:12 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:2684 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1bLPVG-0000Kp-Pc for help-gnu-emacs@gnu.org; Fri, 08 Jul 2016 02:43:11 -0400 In-reply-to: (message from Rusi on Thu, 7 Jul 2016 21:28:06 -0700 (PDT)) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:110725 Archived-At: > Date: Thu, 7 Jul 2016 21:28:06 -0700 (PDT) > From: Rusi > > So now I need to tell my students gnu-apl-mode will not run in emacsen less than > version X > > How to find out X? First, try the NEWS method that someone else pointed to. If that doesn't work, and the symbol is a defcustom, it should have a :version tag (if it isn't, report that as a bug). If that doesn't work either, or is inapplicable, the most elaborate method that _always_ works is this: . C-h f SOMETHING or C-h v SOMETHING . note the place in the sources where SOMETHING is defined . go to the nearest Emacs Git repository and use Git facilities to find out the date on which the code was added . consult etc/HISTORY to see which Emacs release the date corresponds to Notes: (1) The Git facilities are "git annotate" and "git log -L". (2) Due to branching before the release, a date that is before a release doesn't necessarily mean the feature was in that release, you will have to see when the release branch was cut; there should be a Git tag at the branch point.