[tools] Fix SCons build error when `RTT_EXEC_PATH` not found.
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@ -249,7 +249,7 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
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# auto change the 'RTT_EXEC_PATH' when 'rtconfig.EXEC_PATH' get failed
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if not os.path.exists(rtconfig.EXEC_PATH):
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if os.environ['RTT_EXEC_PATH']:
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if 'RTT_EXEC_PATH' in os.environ:
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# del the 'RTT_EXEC_PATH' and using the 'EXEC_PATH' setting on rtconfig.py
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del os.environ['RTT_EXEC_PATH']
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reload(rtconfig)
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