From 546a40a653d87d8610a5c58b3e6d3c608dfc6f33 Mon Sep 17 00:00:00 2001
From: Xinyu Hou <xinyu@synergy-project.org>
Date: Tue, 4 Nov 2014 13:27:47 +0000
Subject: [PATCH] Checked source and target existence when move #4149

---
 ext/toolchain/commands1.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ext/toolchain/commands1.py b/ext/toolchain/commands1.py
index 1dd15f65..bc260944 100644
--- a/ext/toolchain/commands1.py
+++ b/ext/toolchain/commands1.py
@@ -795,8 +795,10 @@ class InternalCommands:
 			os.symlink(source, target)
  
 	def move(self, source, target):
-		print 'move: ', source,'-->', target
-		shutil.move(source, target)
+		if os.path.exists(source):
+			if not os.path.exists(target):
+				print 'move: ', source,'-->', target
+				shutil.move(source, target)
 
 	def macPostMake(self, target):