hard20 pts · first answer countsembedded-cdebugging

Works at -O0, fails at -O2

Firmware works with optimisation off but fails at -O2. Which is the most likely root cause?

A.The -O2 compiler is buggy and should never be used in productionB.Undefined behaviour or missing volatile, such as uninitialised variables, strict aliasing violations or a delay loop the compiler removedC.-O2 changes the CPU clock speedD.The flash is too slow for optimised code

← Missed motor control interrupts An overflow check that vanishes →