Prevent GCC LTO from deleting function

Try calling the function from a separate function which is marked used.

void dummyFunction(void) __attribute__((used));

// Never called.
void dummyFunction(void) {
    vTaskSwitchContext();
}

You can add -Wl,--undefined=vTaskSwitchContext to your LDFLAGS.

For some reason, the solution that Dietrich proposed didn't work for me. I'm using Infineon's DAVE 4 (basically eclipse with a fancy code generation plugin for their line of XMC microcontrollers), which may be the reason why it didn't work. For me, I had to call vTaskSwitchContext() after vTaskStartScheduler():

int main(){

    initializationCode();

    vTaskStartScheduler();

    //Code never reaches here
    vTaskSwitchContext();
}