Code review comment for lp:~raof/mir/fix-and-enable-lto

+ -DMIR_LINK_TIME_OPTIMIZATION=ON

While this is probably right, we ought to be explicit about which builds we want this optimization for (as it can slow things quite a bit).

I'd suggest not for the "normal" CI and developer builds where fast turnaround is desirable.

I think problems will be rare enough that enabling for autolanding would be fine as a final check. And for release.

Is that what happens?

(It also suggests the question of any compile-time optimizations we might want to enable.)