Compiler/MSP430G2553: How to Compile Code with MSP430-GCC-OPENSOURCE without Linking Run Time Library?

Tool/software: TI C/C++ Compiler

My code works fine, but takes additional ~ 700bytes. I am not gcc expert. How not to link the runtime library?

Code:

#include<msp430g2553.h>

int main(void){

WDTCTL = WDTPW | WDTHOLD;

P1DIR = BIT0;
P1OUT = BIT0;

while(1);//never exits

}

Compiling command line: msp430-elf-gcc -O2 -g mycode.c -o mycode.o

objdump result: