how to interface assembler code into c

[sakthivenus]

hi....i interface my assembler code into c....my code is
#include <REG51.h>

void sakthi();
void main() {
sakthi();
}
void sakthi( )
{
#pragma ASM
MOV A,R0
MOV R0,A
#pragma ENDASM
}
..but i get some warning messages like
WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
ADDRESS: 080AH
but i set "generate assembler SRC file and assemble SRC file"......what is this warning actually?......