rust non-determinism

[Richard Purdie]

On Tue, 2024-08-06 at 11:48 +0200, Bernhard M. Wiedemann wrote:
> On 06/08/2024 10.03, Richard Purdie wrote:
> > 
> > We found we had to disable both lto and use codegen-units=1 to make
> > things always reproduce. It took us months to work that out!
> 
> This sounds similar to the issue I see.
> Do you have a simple reproducer?
> When I try rustc with a hello-world.rs the binary only varies from
> path 
> when I add -g and no -C strip=debuginfo
> but that is independent of lto and codegen-units.
> 
> Maybe it needs some library?

We've struggled to reduce it down outside of the rust build environment
so sadly we don't have a simple reproducer, no.

Cheers,

Richard