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bug#18780: 24.4; configure script should disable PIE on all platforms
From: |
Adam Sampson |
Subject: |
bug#18780: 24.4; configure script should disable PIE on all platforms |
Date: |
Mon, 20 Oct 2014 23:41:37 +0100 |
Dear Emacs maintainers,
In the configure script for Emacs 24.4, position-independent executable
support is currently explicitly disabled for temacs on Darwin and
OpenBSD by adding options (-fno-pie, -nopie) to LD_SWITCH_SYSTEM_TEMACS.
However, it's possible to have GCC configured to use PIE by default on
other platforms -- for example, Debian, Ubuntu and Gentoo provide
"hardened" GCC configurations. If you try to build Emacs with a
PIE-ified GCC, temacs will segfault; you need to explicitly pass the
no-pie options to configure.
I ran into this on my GARstow system, but here's an example of a Gentoo
user being tripped up by the same thing:
https://bugs.gentoo.org/494316
Would it be possible for the configure script to add the -fno-pie/-nopie
options by default to LD_SWITCH_SYSTEM_TEMACS, if they're accepted by
the toolchain? That way you could build Emacs with a PIE-ified GCC
without special treatment, and you wouldn't need the special cases for
Darwin and OpenBSD.
Thanks,
Adam
In GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.25)
of 2014-10-20 on gar-amd64
Windowing system distributor `The X.Org Foundation', version 11.0.11600000
Configured using:
`configure --prefix=/gar --sysconfdir=/etc --localstatedir=/var
--sharedstatedir=/var/com --with-x-toolkit=gtk2 --without-gconf
--with-gameuser=_garstow_no_such_user CFLAGS= CPPFLAGS= LDFLAGS='
Important settings:
value of $LC_COLLATE: C
value of $LANG: en_GB.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
shell-dirtrack-mode: t
display-time-mode: t
tooltip-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
global-visual-line-mode: t
visual-line-mode: t
transient-mark-mode: t
Recent input:
C-x 1 M-x r e p o r t - e m <tab> <return>
Recent messages:
Loading tex-mode...done
Loading sendmail...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Load-path shadows:
/home/ats/.Emacs/snake hides /gar/share/emacs/24.4/lisp/play/snake
/gar/share/emacs/site-lisp/timeclock hides
/gar/share/emacs/24.4/lisp/calendar/timeclock
Features:
(shadow sort gnus-util mail-extr emacsbug message idna format-spec
rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader org-install warnings server sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils
cus-edit easymenu wid-edit cl-loaddefs cl-lib tex-mode compile shell
pcomplete comint ansi-color ring cus-start cus-load time time-date
tooltip electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
newcomment lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp
files text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)
Memory information:
((conses 16 103533 26209)
(symbols 48 20482 1)
(miscs 40 35 126)
(strings 32 17390 21949)
(string-bytes 1 497465)
(vectors 16 11430)
(vector-slots 8 404627 21346)
(floats 8 74 57)
(intervals 56 185 50)
(buffers 960 13)
(heap 1024 14884 3581))
--
Adam Sampson <ats@offog.org> <http://offog.org/>
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