In CCS 12.8.1, using ticlang compiler, in project folder I can find interrupt prototypes under Referenced Source / SysConfig / startup_mspm0l110x_ticlang.c.
GPIO0/PORTA interrupt is in INT_GROUP1 for mspm0l1105 so you must use GROUP1_IRQHandler in your code.
Additionally you must enable gpio interrupt in NVIC yourself:
//- GPIOA:
// + Standard Output: PA26 (LED)
// + Standard Input with internal pull-up: PA16 (BUTTON)
void GROUP1_IRQHandler(void)
{
DL_GPIO_togglePins(GPIOA, OUTPUT_LED_PIN);
}
int main(void)
{
SYSCFG_DL_init();
NVIC_EnableIRQ(GPIOA_INT_IRQn);
while (1)
{
}
}