Discussion
Assertion (A): Debugging optimised code is notoriously difficult.
Reason (R): Optimisation reorders and eliminates computations so the machine state no longer corresponds simply to any point in the source.
Answer: A
Both are true and the reason gives the mechanism, and this is why builds are often produced twice. A variable may be held in a register at one moment and nowhere at all the next, so the debugger cannot always report its value.
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