[Pkg-rust-maintainers] Bug#1147372: Bug#1147372: rust-coreutils regressed in reproducibility

[Paul Gevers]

Hi,

On Fri, 11 Sep 2026 15:08:21 +0200 =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?= 
<lists at fabian.gruenbichler.email> wrote:
> On Fri, Sep 11, 2026, at 2:22 PM, Sylvestre Ledru wrote:
> > Le 11/09/2026 à 14:16, Jochen Sprickerhof a écrit :
> >>
> >>> How can i work around this?
> >>
> >> By reverting the change. I am not aware of a way to make PGO 
> >> reproducible.
> 
> this probably warrants some broader discussion..
> 
> I think the only way to implement PGO and reproduciblity is to treat
> the profiles as allowed generated input to the build (i.e., lift the
> restriction of "all pre-generated parts of the upstream source must be
> regenerated as part of the build" for them).

So, how to move forward? This feels a bit like the community behind 
reproducible builds should paper out a general solution to deal with PGO 
in binary distributions, which is unlikely to happen overnight. Do we 
agree on that? If so, I think we should let rust-coreutils migrate now.

Which also means that we should ensure "this probably warrants some 
broader discussion". I have the impression that's somewhat already 
happening, but I've only seen it on IRC. Can somebody link to broader 
discussion (if it exists already)?

Paul