GCC optimization removes interrupt service routine. This happens at least with -O1 and -Os. The ISR is removed and the interrupt vector is not set. Thus the occurring interrupt will jump to 0xffff.
We use current gcc_msp430_4.9.14r1_167 of CCS for a MSP430 target microcontroller.
Attached you will find a stripped down source code and also the elf-files, readelf output and a memory dump.
