From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.bugs Subject: bug#23529: Request for fixing randomize_va_space build issues Date: Wed, 7 Sep 2016 13:12:27 -0700 Organization: UCLA Computer Science Department Message-ID: <478e7c97-9339-5072-f9c1-ec67a45113aa@cs.ucla.edu> References: <573C2601.3030308@cs.ucla.edu> <54b89449-083a-a906-986a-f284dbbf482a@cs.ucla.edu> <02c57124-ef39-bc30-89ba-998986d070fc@cs.ucla.edu> <834m5tapuu.fsf@gnu.org> <83twdsalbk.fsf@gnu.org> <83r38vaiyh.fsf@gnu.org> <83eg4vab5o.fsf@gnu.org> <831t0va8br.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1473279201 29776 195.159.176.226 (7 Sep 2016 20:13:21 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 7 Sep 2016 20:13:21 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 Cc: p.stephani2@gmail.com, philippe.vaucher@gmail.com, 23529@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Sep 07 22:13:14 2016 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bhjDd-00074n-Nu for geb-bug-gnu-emacs@m.gmane.org; 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Wed, 07 Sep 2016 20:13:01 +0000 Original-Received: (at 23529) by debbugs.gnu.org; 7 Sep 2016 20:12:40 +0000 Original-Received: from localhost ([127.0.0.1]:52918 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bhjD6-0001QC-I5 for submit@debbugs.gnu.org; Wed, 07 Sep 2016 16:12:40 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:46104) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bhjD4-0001Py-8R for 23529@debbugs.gnu.org; Wed, 07 Sep 2016 16:12:38 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 78B82161171; Wed, 7 Sep 2016 13:12:31 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id RwkXOE1XCNWW; Wed, 7 Sep 2016 13:12:30 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id BFE80161149; Wed, 7 Sep 2016 13:12:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id KQi6QT7VAR5v; Wed, 7 Sep 2016 13:12:30 -0700 (PDT) Original-Received: from Penguin.CS.UCLA.EDU (Penguin.CS.UCLA.EDU [131.179.64.200]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id A4A55161144; Wed, 7 Sep 2016 13:12:30 -0700 (PDT) In-Reply-To: <831t0va8br.fsf@gnu.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:123071 Archived-At: On 09/07/2016 11:11 AM, Eli Zaretskii wrote: > Data that has to be dumped and loaded are accessed through pointers Sure, but the data contains pointers to other data (and perhaps to code? I haven't checked), and when the pointer-containing data is loaded into a fresh Emacs those pointers need to be relocated appropriately for the new Emacs. > We'd need to plug the compiled data into > data structures that support the Lisp interpreter, something which the > compiler and linker won't help us. Ah, but they can! Because Emacs now assumes the LSB representation, Emacs objects now encapsulate pointers simply by adding a constant to them. All C compilers and linkers support that, even for addresses defined by other compilation units.