bug#74142: [rust-team] rust-bootstrap fails parallel build on x86-64

[Efraim Flashner <efraim@flashner.co.il>]

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On Thu, Oct 31, 2024 at 03:13:40PM -0400, Greg Hogan wrote:
> derivation: 83qbfg0xxsfr5lsc81m5a770c7c7b55k-rust-1.54.0.drv
> commit: 6e50b0c56a8cc767bd3acb26638f78c450bde718
> 
> Build log attached, tail portion below. Has consistently failed to
> build unless cores=1.
> 
> The package definition has "#:parallel-build? ,(target-x86-64?)" but
> the noted build issue ("race conditions between various dependent
> crates") is also seen on x86-64.
> 
> It is only the 1.54 build with mrustc that fails in this manner, the
> following rust packages in the chain build fine with parallelism
> enabled.
> 
> Greg

I see the note there says something about ppc64le having a race
condition too. My machine has "only" 24 cores, so I didn't run into
anything, but I see you're building with 32 cores. IIRC the ppc64le
machine was building with at least 32 cores also.

Can you try building rust-1.54 with only 24 cores and see if that works
for you? If it does then I think we can switch the (job-count) variable
to (min 24 (parallel-job-count))

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