first

rt-thread/components/drivers/serial/SConscript

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+from building import *
+
+cwd = GetCurrentDir()
+CPPPATH = [cwd + '/../include']
+group = []
+src = []
+
+if not GetDepend(['RT_USING_SERIAL']):
+    Return('group')
+
+if GetDepend(['RT_USING_SMART']):
+    src += Glob('serial_tty.c')
+
+if GetDepend(['RT_USING_SERIAL_V2']):
+    src += ['serial_v2.c']
+else:
+    src += ['serial.c']
+
+if GetDepend(['RT_USING_DM']):
+    src += ['serial_dm.c']
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')