Hi, On Sun, 2018-02-25 at 12:30 +0000, Zbigniew Jędrzejewski-Szmek wrote: > On Sun, Feb 25, 2018 at 01:19:24PM +0100, Florian Weimer wrote: > > On 02/25/2018 12:45 PM, Zbigniew Jędrzejewski-Szmek wrote: > > > > What's our current take on using LTO for Fedora package builds? > > > systemd would like to use it. > > > > Why? What are the benefits? > > There's a small change in size. When I tested recently it was ~7%, > but > it was higher in the past. Fedora builds usually enable almost all > optional > code, but if some parts are disabled (which happens also in RHEL), I > think > the gains are bigger. (you probably are aware, sorry for saying something trivial). But we like to build NetworkManager with -fdata-sections -ffunction-sections -Wl,--gc-sections and let the linker figure out which static functions can be removed. (we have unused static functions, because we build a static library that is used by several binaries). (you also need a linker script to hide static functions so that the linker recognizes them as unused). With this, the binary size savings are considerable and similar to what we'd get with LTO. For NetworkManager we don't use LTO because it results in missing symbols (at least, that was the case about a year ago). https://bugzilla.gnome.org/show_bug.cgi?id=782525 best, Thomas
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