"O4" isn't a thing, apparently, so just use O3.
"O4" isn't a thing, apparently, so just use O3.

Clang warns about this, gcc docs seem to confirm it.

I could've sworn at one point "-O4" indicated
cross-module optimization (-flto and such),
but not sure where that idea came from.

dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter