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

From: Ashish SHUKLA
Subject: bug#24892: {s, }brk removed from FreeBSD 11.x and later, arm64 architecture
Date: Mon, 07 Nov 2016 11:31:17 +0530
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (amd64-portbld-freebsd11.0)


As mentioned in the subject, {,s}brk syscalls are removed from arm64
architecture on FreeBSD 11.x[1]. This causes Emacs to fail to compile on those
platforms. Following is an excerpt from the build process:

--8<---------------cut here---------------start------------->8---
cc -c  -Demacs  -I. -I. -I../lib -I../lib                    -MMD -MF 
deps/gmalloc.d -MP    -Wno-switch 
-Wno-tautological-constant-out-of-range-compare -Wno-pointer-sign 
-Wno-string-plus-int -Wno-unknown-attributes  -O2 -pipe  -fno-strict-aliasing  
cc -c  -Demacs  -I. -I. -I../lib -I../lib                    -MMD -MF 
deps/doc.d -MP    -Wno-switch -Wno-tautological-constant-out-of-range-compare 
-Wno-pointer-sign -Wno-string-plus-int -Wno-unknown-attributes  -O2 -pipe  
-fno-strict-aliasing  doc.c
cc -Demacs  -I. -I. -I../lib -I../lib                    -MMD -MF deps/.d -MP   
 -Wno-switch -Wno-tautological-constant-out-of-range-compare -Wno-pointer-sign 
-Wno-string-plus-int -Wno-unknown-attributes  -O2 -pipe  -fno-strict-aliasing  
-Wl,-znocombreloc   \
  -o temacs  vm-limit.o dispnew.o frame.o scroll.o xdisp.o menu.o  window.o 
charset.o coding.o category.o ccl.o character.o chartab.o bidi.o cm.o term.o 
terminal.o xfaces.o    emacs.o keyboard.o macros.o keymap.o sysdep.o buffer.o 
filelock.o insdel.o marker.o minibuf.o fileio.o dired.o cmds.o casetab.o 
casefiddle.o indent.o search.o regex.o undo.o alloc.o data.o doc.o editfns.o 
callint.o eval.o floatfns.o fns.o font.o print.o lread.o dynlib.oemacs-module.o 
syntax.o unexelf.o bytecode.o process.o gnutls.o callproc.o region-cache.o 
sound.o atimer.o doprnt.o intervals.o textprop.o composite.o xml.o kqueue.o  
profiler.o decompress.o          terminfo.o lastfile.o gmalloc.o     
../lib/libgnu.a                 -lrt  -lexecinfo       -lutil -lncurses         
-lpthread  -lm -lz
alloc.o: In function `Fmemory_limit':
alloc.c:(.text+0x65e8): undefined reference to `sbrk'
unexelf.o: In function `unexec':
unexelf.c:(.text+0x200): undefined reference to `sbrk'
gmalloc.o: In function `__default_morecore':
gmalloc.c:(.text+0x8): undefined reference to `sbrk'
cc: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[2]: *** [Makefile:596: temacs] Error 1
gmake[2]: Leaving directory '/scratch/ashish/work/emacs-25.1/src'
gmake[1]: *** [Makefile:398: src] Error 2
gmake[1]: Leaving directory '/scratch/ashish/work/emacs-25.1'
--8<---------------cut here---------------end--------------->8---

If you need any other information to work on this, please let me know.

[1]  https://reviews.freebsd.org/rS300303

Thanks in advance

“A designer knows he has achieved perfection not when there is nothing
left to add, but when there is nothing left to take away.”
                                              (Antoine de Saint-Exupéry)

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