Why not include GCC's link time optimization?

[FormerMember]

Greetings,

As mentioned in this blog post, GCC compiler -flto flag isn't mysteriously present since SDK 9. devzone.nordicsemi.com/.../

Any specific reason for this? Thanks.

[Stian Røed Hafskjold]

The reason, as far as I know, is that we saw problems with volatiles not being compiled correctly. And the difference in performance was not that big.

[FormerMember]

Thanks for the info. Any more specific info on what aspect was breaking with volatile variables when Link Time Optimization was enabled?