Date: Fri, 18 Nov 2016 08:21:04 -0800
From: Paul Eggert <eggert@cs.ucla.edu>
To: Ashish SHUKLA <ashish.is@lostca.se>
Cc: 24892@debbugs.gnu.org, freebsd-hackers@freebsd.org
Subject: Re: bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architecture
Message-ID: <5ec481c4-41e1-c7dd-433d-f533653b132f@cs.ucla.edu>
In-Reply-To: <8637ipm0nb.fsf@lostca.se>
References: <82a03552-8f33-2dbe-6bb5-54f649b29db7@cs.ucla.edu> <86vavxs2cn.fsf@members.fsf.org> <5adee8d9-8f08-9536-a95f-ae64719d6a0f@cs.ucla.edu> <mvminrxc7f2.fsf@hawking.suse.de> <c9396165-da2e-3c41-ec2b-070ce9c885bb@cs.ucla.edu> <mvmtwbfachr.fsf@hawking.suse.de> <40f8df50-b431-1ebd-221c-df2aa453aa81@cs.ucla.edu> <mvmfumz8e2u.fsf@hawking.suse.de> <06ee71fd-1a64-d32b-862e-c725807aef4e@cs.ucla.edu> <mvm60nv8cky.fsf@hawking.suse.de> <876cf047-82fb-f08c-bbb3-024206f6fabd@cs.ucla.edu> <83twb6dnkm.fsf@gnu.org> <8637ipm0nb.fsf@lostca.se>
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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.
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