From f1fdb5bc575728bd6c9f13a18939d9c271a74e83 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 29 Aug 2017 12:49:22 -0700
Subject: [PATCH] Align stack bottom properly.

This is needed for gcc -Os -flto on x86-64 (Bug#28213).
* src/emacs.c (main): Align stack-bottom variable as a pointer,
since mark_memory requires this.
---
 src/emacs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/emacs.c b/src/emacs.c
index 0fec7167588..44f6285795a 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -672,7 +672,10 @@ close_output_streams (void)
 int
 main (int argc, char **argv)
 {
-  char stack_bottom_variable;
+  /* Variable near the bottom of the stack, and aligned appropriately
+     for pointers.  */
+  void *stack_bottom_variable;
+
   bool do_initial_setlocale;
   bool dumping;
   int skip_args = 0;
@@ -688,7 +691,7 @@ main (int argc, char **argv)
   char *original_pwd = 0;
 
   /* Record (approximately) where the stack begins.  */
-  stack_bottom = &stack_bottom_variable;
+  stack_bottom = (char *) &stack_bottom_variable;
 
 #ifndef CANNOT_DUMP
   dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
-- 
2.39.2