-Os generates smaller code, at the expense of performance. On desktop,
this tradeoff is not necessarily the best, especially when considering
the vast performance difference. Most downstream redistributors also
don't do PGO and don't override defaults, so they would tend to ship
slower builds as a consequence.
We however keep -Os as default for debug builds for now, because -O2
triggers -Werror=strict-overflow failures somehow.
--HG--
extra : rebase_source : ad2f4fedb7934b6b23b84412c86b30d29a8fb5f8
d4a59a2d9d