On Mon, Nov 9, 2020 at 12:30 AM Andreas Müller <[email protected]> wrote: > > On Mon, Nov 9, 2020 at 1:02 AM Khem Raj <[email protected]> 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. > Andreas
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