哪位高手能帮忙解释一下这个问题，在CCS5.4工程编译时出现的

#10010 errors encountered during linking; "PMSM_FOC.out" not built 

#10234-D</a>  unresolved symbols remain
unresolved symbol __IQdiv2, first referenced in ./SOURCE/main.obj

unresolved symbol __IQmpy2, first referenced in ./SOURCE/main.obj