From 0fd3fbddbf0f416bc45a6cd38d001484c4c18c40 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <campbell@mumble.net>
Date: Mon, 3 Jun 2013 19:17:41 +0000
Subject: [PATCH] On Mac OS X, use mmap(MAP_FIXED) only for i386.

---
 src/microcode/ux.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/microcode/ux.h b/src/microcode/ux.h
index 7c002ab87..2c4866ef8 100644
--- a/src/microcode/ux.h
+++ b/src/microcode/ux.h
@@ -129,7 +129,11 @@ USA.
 #ifdef HAVE_SYS_MMAN_H
 #  include <sys/mman.h>
 #endif
-#ifdef __APPLE__
+
+/* On Mac OS X/i386, we instruct the linker to reserve all the usable
+   low virtual address space for us, so we can safely use
+   mmap(MAP_FIXED) to map the heap.  */
+#if ((defined (__APPLE__)) && (defined (__IA32__)))
 #  define USE_MAP_FIXED 1
 #endif
 
-- 
2.25.1