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-rw-r--r--tools/building.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/building.py b/tools/building.py
index a4fc2c1aab..4bcc86428b 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -784,8 +784,8 @@ def DoBuilding(target, objects):
CFLAGS = Env.get('CFLAGS', '') + group.get('LOCAL_CFLAGS', '')
CCFLAGS = Env.get('CCFLAGS', '') + group.get('LOCAL_CCFLAGS', '')
CXXFLAGS = Env.get('CXXFLAGS', '') + group.get('LOCAL_CXXFLAGS', '')
- CPPPATH = Env.get('CPPPATH', ['']) + group.get('LOCAL_CPPPATH', [''])
- CPPDEFINES = Env.get('CPPDEFINES', ['']) + group.get('LOCAL_CPPDEFINES', [''])
+ CPPPATH = list(Env.get('CPPPATH', [''])) + group.get('LOCAL_CPPPATH', [''])
+ CPPDEFINES = list(Env.get('CPPDEFINES', [''])) + group.get('LOCAL_CPPDEFINES', [''])
ASFLAGS = Env.get('ASFLAGS', '') + group.get('LOCAL_ASFLAGS', '')
for source in group['src']: