From 2d45a5be18ee61e23dfe6af4e23f1eda3595b22c Mon Sep 17 00:00:00 2001
From: Ulrich Müller <ulm@gentoo.org>
Date: Mon, 16 Mar 2015 17:09:54 +0100
Subject: configure.ac: Add -nopie to LD_SWITCH_SYSTEM_TEMACS.

* configure.ac (LD_SWITCH_SYSTEM_TEMACS): Add -nopie option if it
is supported, in order to avoid segfaults in temacs.  (Bug#18784)
---
 configure.ac | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 44709d47ab8..d2a9b375e40 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5027,11 +5027,22 @@ case "$opsys" in
    esac
    ;;
 
-  openbsd) LD_SWITCH_SYSTEM_TEMACS='-nopie' ;;
-
   *) LD_SWITCH_SYSTEM_TEMACS= ;;
 esac
 
+AC_CACHE_CHECK([whether the linker accepts -nopie],
+  [emacs_cv_prog_cc_nopie],
+  [emacs_save_LDFLAGS=$LDFLAGS
+  LDFLAGS="$LDFLAGS -nopie"
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+    [emacs_cv_prog_cc_nopie=yes],
+    [emacs_cv_prog_cc_nopie=no])
+  LDFLAGS=$emacs_save_LDFLAGS])
+if test "$emacs_cv_prog_cc_nopie" = yes; then
+  # Disable PIE to avoid segfaults in temacs (bug#18784)
+  LD_SWITCH_SYSTEM_TEMACS="$LD_SWITCH_SYSTEM_TEMACS -nopie"
+fi
+
 if test x$ac_enable_profiling != x ; then
   case $opsys in
     *freebsd | gnu-linux) ;;
-- 
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