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bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architect

From: Paul Eggert
Subject: bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architecture
Date: Wed, 9 Nov 2016 09:52:06 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/09/2016 01:46 AM, Andreas Schwab wrote:
If so, what is the difference in value there between sbrk (0) and ((byte
>*) old_bss_addr + old_bss_size), in the region of unexelf.c that computes
>one or the other?
The former includes the heap.

Yes, and I'm curious about what the difference actually is, so that we can figure out how to compute it ourselves now that sbrk has been withdrawn. On FreeBSD 11.0 x86-64 (which still has sbrk) the difference is 0 for Emacs master, but on AMD apparently the value is something other than 0.

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