There are a few differences in how you code under msp430-gcc, as compared to using the TI windows IDE/CCE.
You will find that in some cases you will have to remove lines and add others.
You will need to add #include<signal.h> for interrupts
Gcc does not support this: #pragma vector=TIMERA0_VECTOR, so you must remove it or put remark lines in front of it. "//"
This code in CCE "__interrupt void Timer_A (void)" becomes interrupt (TIMERA0_VECTOR) Timer_A (void)