[Python-Dev] first post introduction and question regarding lto (original) (raw)
Victor Stinner victor.stinner at gmail.com
Wed Aug 9 05:16:36 EDT 2017
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There is already a ./configure --with-lto flag, why not using it?
I'm using --with-lto without PGO for months, I never noticed that the option is fully ignored!
Victor
2017-08-09 9:52 GMT+02:00 Antoine Pitrou <solipsis at pitrou.net>:
On Wed, 9 Aug 2017 13:36:28 +1000 Nick Coghlan <ncoghlan at gmail.com> wrote:
On 8 August 2017 at 10:12, Gregory P. Smith <greg at krypto.org> wrote: > I don't know whether it is beneficial or not - but having the capability to > build LTO without PGO seems reasonable. I can review any pull requests > altering configure.ac and Makefile.pre.in to make such a change.
Being able to separate them seems useful even if it's just from the performance research perspective of comparing "PGO only", "LTO only" and "PGO+LTO". That does not mean "LTO only" deserves a configure option, though. PGO is difficult to set up manually so it's fair that we provide dedicated build support for it. LTO should just be a matter of tweaking CFLAGS and LDFLAGS. Regards Antoine.
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