On Mon, Nov 9, 2020 at 8:15 PM Khem Raj <raj.k...@gmail.com> wrote: > > On Mon, Nov 9, 2020 at 12:30 AM Andreas Müller <schnitzelt...@gmail.com> > wrote: > > > > On Mon, Nov 9, 2020 at 1:02 AM Khem Raj <raj.k...@gmail.com> wrote: > > > > > > Distros which want to enable LTO can utilize this file, it only covers > > > packages from OE-Core, other layers should include there own exclusion > > > list for recipe which dont work with LTO > > > > > > Document the needed changes in local.conf.extended > > > > > Maybe I missed something but I haven't seen a word why I should want > > link time optimization. And from the patches I see here it seems we > > are about to create another contributor's burden. > > > > Thanks for your feedback. LTO is quite beneficial for the kind of > images OE is targeting, > It results in smaller binaries and better optimizations as well. LTO > has been around for a while > in GCC but it is becoming useful with gcc10+ and more distros e.g. > Fedora/SuSE are also starting > to use LTO distro wide which means we will be able to reuse the > upstream work that's ongoing in > different packages. You can see there are patches already floating to > enable it for poky-tiny already > so OE userbase is already starting to use it. Moreover, its already > default for many packages themselves > so you might already be using it at package level e.g. systemd > > This is similar to what we did for enabling security flags. As you > can see, these changes are currently optional. This means they won't > go into effect for > distros without them choosing to use it via DISTRO_FEATURES. Since it > takes a bit to get > such changes stable, we might keep it disabled by default for the next > release depending upon > how it pans out. Eventually, the plan is to enable it for poky/yocto distro. > > As far as the contribution burden, I think it won't be a blocker until > it becomes one of the tested configurations > on yocto auto-builder. > > Feel free to express if you have more concerns. > Thanks for explanation. At least I understand better now why you (and others?) are taking efforts on LTO support.
Andreas
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