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Build failure on ppc64el in Emacs 24.5

From: Rob Browning
Subject: Build failure on ppc64el in Emacs 24.5
Date: Sun, 17 Jan 2016 18:19:53 -0600
User-agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu)

The most recent Debian package version won't build on ppc64el, failing

  emacs: Program segment above .bss in

Which I suspect may be related to (fixed by) this change in emacs-25:

  commit c9fd597a4cffcae873b25381ee8cc755f0debe95
  Author: Paul Eggert <address@hidden>
  Date:   Mon Nov 16 17:48:08 2015 -0800

    ELF unexec: align section header
    This ports the recent unexelf.c changes to Fedora x86-64
    when configured with GCC’s -fsanitize=undefined option.
    * src/unexelf.c (unexec): Align new_data2_size to a multiple
    of ElfW (Shdr)’s alignment, so that NEW_SECTION_H returns a
    pointer aligned appropriately for its type.

However, at least from a quick glance, it looks like that patch might
not apply very easily to emacs-24.  So before I delve, I wanted to ask
about it here.

I suppose if the 25 release is fairly close, I could also consider just
spending the time there, and then (if everything works out) removing
emacs24 from sid/stretch (the next release), which would be *great*.
(Of course that assumes this issue won't affect jessie (stable).)

cf. https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20614

Rob Browning
rlb @defaultvalue.org and @debian.org
GPG as of 2011-07-10 E6A9 DA3C C9FD 1FF8 C676 D2C4 C0F0 39E9 ED1B 597A
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