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,gmane.os.freebsd.devel.hackers Subject: bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architecture Date: Fri, 18 Nov 2016 08:21:04 -0800 Organization: UCLA Computer Science Department Message-ID: <5ec481c4-41e1-c7dd-433d-f533653b132f@cs.ucla.edu> References: <82a03552-8f33-2dbe-6bb5-54f649b29db7@cs.ucla.edu> <86vavxs2cn.fsf@members.fsf.org> <5adee8d9-8f08-9536-a95f-ae64719d6a0f@cs.ucla.edu> <40f8df50-b431-1ebd-221c-df2aa453aa81@cs.ucla.edu> <06ee71fd-1a64-d32b-862e-c725807aef4e@cs.ucla.edu> <876cf047-82fb-f08c-bbb3-024206f6fabd@cs.ucla.edu> <83twb6dnkm.fsf@gnu.org> <8637ipm0nb.fsf@lostca.se> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1479486137 24662 195.159.176.226 (18 Nov 2016 16:22:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 18 Nov 2016 16:22:17 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 Cc: freebsd-hackers@freebsd.org, 24892@debbugs.gnu.org To: Ashish SHUKLA Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Nov 18 17:22:12 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 1c7lvY-0005Li-89 for geb-bug-gnu-emacs@m.gmane.org; Fri, 18 Nov 2016 17:22:12 +0100 Original-Received: from localhost ([::1]:37659 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c7lvb-0002Q7-Ib for geb-bug-gnu-emacs@m.gmane.org; Fri, 18 Nov 2016 11:22:15 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:42632) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c7lvR-0002Ny-6Y for bug-gnu-emacs@gnu.org; Fri, 18 Nov 2016 11:22:06 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c7lvO-0004lf-3Q for bug-gnu-emacs@gnu.org; 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Fri, 18 Nov 2016 08:21:04 -0800 (PST) In-Reply-To: <8637ipm0nb.fsf@lostca.se> 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:125836 gmane.os.freebsd.devel.hackers:58197 Archived-At: Ashish SHUKLA wrote: > One of the FreeBSD developer has > pointed me to this ongoing discussion[1] on freebsd-hackers@ list. > > References: > [1] https://lists.freebsd.org/pipermail/freebsd-hackers/2016-November/= 050144.html OK, thanks, I'll CC: freebsd-hackers. FreeBSD hackers: this is following = up on=20 this serious Emacs bug report, which says that Emacs no longer works on F= reeBSD=20 11.x arm64: https://bugs.gnu.org/24892 The referenced FreeBSD discussion appears to be under the misapprehension= that=20 sbrk is useful only to estimate how much memory is in use, and since this= use=20 has long been wrong sbrk should be unceremoniously removed. Unfortunately= , this=20 assumption is incorrect for Emacs, as (bleeding-edge) Emacs uses its own=20 allocator during its build process, and reverts to malloc only during use= r=20 operation. (The build-time Emacs makes a copy of itself in a new executab= le, and=20 relies on sbrk during the build.) Obviously this is dicey and we are plan= ning to=20 change Emacs to make it more portable; however, this will require nontriv= ial=20 reengineering on our part. In the meantime we respectfully request that sbrk functionality be kept i= n=20 FreeBSD 11.x arm64 for a while. It is fine to mark it as deprecated or ob= solete,=20 or even rename it, but please do not remove the functionality entirely.