Re: RFC: Moving to -O3 for Fedora Linux

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On Thu, Oct 31, 2024 at 07:28:35AM -0400, Neal Gompa wrote:
> SUSE has the benefit of their build system taking care of automatic
> rebuilds and simple build loops for them. This allows them to have a
> much more hands-off approach than we do, and gives their packagers
> significantly more breathing room to take advantage of things like
> this.

PGO is something that should be done within the build of a single package,
so I don't see how that is related.
There is also AutoFDO where one just builds programs/libraries, then
runs them under profiler separately and can then just pass the profiler
saved details to next build, which is something that in theory
could be used across different rpm builds, but AutoFDO larger goes against
package build reproducibility (normal PGO can be only problem for
reproducibility in multi-threaded programs built with
-fprofile-update=single or if threads aren't properly joined; one can build
with explicit -fprofile-update=atomic or just compile/link with -pthread
to get atomic (sure, more expensive) profile counter updates).

	Jakub

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