linker warning

hi all,

i am building 8051 application in keil compiler.i got an warning message when linking... like this.....
*** WARNING L16: UNCALLED SEGMENT,IGNORED FOR OVERLAY PROCESS
SEGMENT :?PR?_ANALOGVOL?ANALOG

from the above warning ...analogvol is an function..analog is a file name which is having the definition of analogvol....please help me to find out this and how to clear.....
thanks in advance.
m.y.sam

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