[Patch AArch64] Add cpu_defines.h for AArch64.

[Ramana Radhakrishnan <ramana dot radhakrishnan at foss dot arm dot com>]

Hi,

Like the ARM port, the AArch64 ports needs to set glibc_integral_traps 
to false as integer divide instructions do not trap.

Bootstrapped and regression tested on aarch64-none-linux-gnu

Ok to apply ?

regards
Ramana


2015-05-17  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

        * configure.host: Define cpu_defines_dir for AArch64
        * config/cpu/aarch64/cpu_defines.h: New file.

>From 1e38b2a848a313e5b98494094b198b7a1e34c59c Mon Sep 17 00:00:00 2001
From: Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
Date: Mon, 18 May 2015 15:45:49 +0100
Subject: [PATCH 2/2] Do the same for AArch64.

---
 libstdc++-v3/config/cpu/aarch64/cpu_defines.h | 36 +++++++++++++++++++++++++++
 libstdc++-v3/configure.host                   |  3 +++
 2 files changed, 39 insertions(+)
 create mode 100644 libstdc++-v3/config/cpu/aarch64/cpu_defines.h

diff --git a/libstdc++-v3/config/cpu/aarch64/cpu_defines.h b/libstdc++-v3/config/cpu/aarch64/cpu_defines.h
new file mode 100644
index 0000000..d5a6fd0
--- /dev/null
+++ b/libstdc++-v3/config/cpu/aarch64/cpu_defines.h
@@ -0,0 +1,36 @@
+// Specific definitions for generic platforms  -*- C++ -*-
+
+// Copyright (C) 2015 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/cpu_defines.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{iosfwd}
+ */
+
+#ifndef _GLIBCXX_CPU_DEFINES
+#define _GLIBCXX_CPU_DEFINES 1
+
+// Integer divide instructions don't trap on AArch64.
+#define __glibcxx_integral_traps false
+
+#endif
diff --git a/libstdc++-v3/configure.host b/libstdc++-v3/configure.host
index 465a40a..b1ca7b7 100644
--- a/libstdc++-v3/configure.host
+++ b/libstdc++-v3/configure.host
@@ -143,6 +143,9 @@ cpu_include_dir=cpu/${try_cpu}
 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
 # THIS TABLE IS SORTED.  KEEP IT THAT WAY.
 case "${host_cpu}" in
+  aarch64*)
+    cpu_defines_dir=cpu/aarch64
+    ;;
   arm*)
     cpu_defines_dir=cpu/arm
     ;;
-- 
1.9.1