On Thu, Jul 11, 2019 at 02:31:35AM +0800, Xi Ruoyao via blfs-dev wrote: > On 2019-07-10 19:22 +0100, Ken Moffat via blfs-dev wrote: > > On Wed, Jul 10, 2019 at 01:08:30PM +0800, Xi Ruoyao via blfs-dev wrote: > > > > > > I only build GCC with LTO using --with-build-config=bootstrap-lto. There > > > are > > > annoying problems with LTO and shared objects with ".symver" directive so > > > I > > > never use LTO for other packages. > > > > > > You may want to consult https://github.com/InBetweenNames/gentooLTO . > > > > Thanks, I've not seen that config option, nor references to the > > problems with .symver. More things for me to read about. > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48200 > > I've tried to write some code for it but my code is just like some pieces of > sh*t. I'll stay and wait for Jan Hubicka to do this work. >
Yes, I read that after following up some of the links. I also looked at his blog from May, and saw that OpenSuSe is _mostly_ moving to LTO. > > The gentooLTO site was one of the places I started looking at before I > > decided to try any of this, but at least I went into it with my eyes > > wide open about never getting the time back. > > > > On the bright side (for me), by doing this I don't have time to test > > Linus's kernels. Congratulations on your testing! > > Just encountered a bug in 5.2 release, which Linus also encountered :(. > Yes indeed. > Now I'm trying to do a Python-3.7.4 build with LTO (its configure script now > supports --with-lto to do a LTO build). A quick test after one of my early builds had completed confirmed it (3.7.3, I think) used PGO (Profile Guided Optimization, for those not familiar with that TLA) and the build takes a _lot_ longer. I build Python3 twice: once in LFS, and then fairly early in BLFS after I've built extra dependencies. Was thinking about using LTO for the second build, but at the moment I don't use Python3 much and I doubt that the benefits when running things like Meson will be more than a few milliseconds per package. But Jan's blog (or Honza as he calls himself) mentioned that libreoffice uses LTO by default so I might try adding that option to the Pythons (if 2 accepts it). Decisions, decisions. ĸen -- This is magic for grown-ups; it has to be hard because we know there's no such thing as a free goblin. -- Pratchett, Stewart & Cohen - The Science of Discworld II -- http://lists.linuxfromscratch.org/listinfo/blfs-dev FAQ: http://www.linuxfromscratch.org/blfs/faq.html Unsubscribe: See the above information page
