What is LTO?
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Simple meaning
Link-time optimization analyzes across translation units.
WHY — Performance instead of guessing?
Why interviewers care about Performance:
Performance questions separate people
who only read docs from people who shipped.
Keep it short, concrete,
and tied to C++ work.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Link-time optimization analyzes across
translation units.
- 2Why it exists
Bigger binaries can run faster.
- 3How it works
Build times grow.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Say this line
“Bigger binaries can run faster.”
Break into beats
Biggerbinariescanrunfaster
Speaking order
298740833747163290
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Link-time optimization analyzes across translation units. Bigger binaries can run faster.