From 762427bedc8a0109971456fb8059866e67de867d Mon Sep 17 00:00:00 2001
From: "yaxing.chen" <chenyaxing@rt-thread.com>
Date: Fri, 5 Mar 2021 17:13:18 +0800
Subject: [PATCH] bugfix:remove duplicate files in src list before DefineGroup

---
 tools/building.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/building.py b/tools/building.py
index ba995af278..00a9f04107 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -626,6 +626,8 @@ def DefineGroup(name, src, depend, **parameters):
     group['name'] = name
     group['path'] = group_path
     if type(src) == type([]):
+        # remove duplicate elements from list
+        src = list(set(src))
         group['src'] = File(src)
     else:
         group['src'] = src