From 42d988ed6738ccc3bb0d9750219eb196a1dd7572 Mon Sep 17 00:00:00 2001
From: Bernard Xiong <bernard.xiong@gmail.com>
Date: Sun, 11 Nov 2018 20:04:25 +0800
Subject: [PATCH] [Tools] Fix the RTT_ROOT issue

---
 tools/building.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/building.py b/tools/building.py
index fcc9c40024..cbd245b948 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -202,6 +202,11 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
 
     Env = env
     Rtt_Root = os.path.abspath(root_directory)
+
+    # make an absolute root directory
+    RTT_ROOT = Rtt_Root
+    Export('RTT_ROOT')
+
     # set RTT_ROOT in ENV
     Env['RTT_ROOT'] = Rtt_Root
     # set BSP_ROOT in ENV