importosimportsysimportrtconfigifos.getenv('RTT_ROOT'):RTT_ROOT=os.getenv('RTT_ROOT')else:RTT_ROOT=os.path.join(Dir('#').get_abspath(),'..','..','rt-thread')sys.path=sys.path+[os.path.join(RTT_ROOT,'tools')]frombuildingimport*TARGET='rtthread-lpc40xx.'+rtconfig.TARGET_EXTenv=Environment(tools=['mingw'],AS=rtconfig.AS,ASFLAGS=rtconfig.AFLAGS,CC=rtconfig.CC,CCFLAGS=rtconfig.CFLAGS,AR=rtconfig.AR,ARFLAGS='-rc',LINK=rtconfig.LINK,LINKFLAGS=rtconfig.LFLAGS)env.PrependENVPath('PATH',rtconfig.EXEC_PATH)Export('RTT_ROOT')Export('rtconfig')# prepare building environmentobjs=PrepareBuilding(env,RTT_ROOT,has_libcpu=False)# do building DoBuilding(TARGET,objs)