From: Taylor R Campbell <campbell@mumble.net>
Date: Mon, 3 Jun 2013 19:17:41 +0000 (+0000)
Subject: On Mac OS X, use mmap(MAP_FIXED) only for i386.
X-Git-Tag: release-9.2.0~169
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=0fd3fbddbf0f416bc45a6cd38d001484c4c18c40;p=mit-scheme.git

On Mac OS X, use mmap(MAP_FIXED) only for i386.
---

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