[Pkg-rust-maintainers] Bug#1102311: Bug#1102311: rust-src is missing Cargo.lock

[Matt Corallo]

On 4/7/25 3:47 PM, Fabian Grünbichler wrote:
> That's bookworm, the version with the fix came later, Trixie/did ship the Cargo.lock file:

Ha, apologies, I'd filed this against the wrong version. Glad its fixed in trixie, at least.

> 
>>> note that this lock file includes a lot of things that we actually
>>> remove when doing the package build, and versions might not line up
>>> 100% as a result, so it is possible for this to fail still or be
>>> buggy.
>>>
>>> shipping the actually used Cargo.lock file would require also shipping
>>> a copy of all the vendored crates used for the build in their patched
>>> form (since those would be referenced by that Cargo.lock file), and
>>> configuring the build to use it (at least for building core and std and
>>> friends).
>>
>> Specifically, my issue is that building with the above command results in failures because cargo pulls the latest `compiler-builtins` when building with -Zbuild-std which fails to build (as compiler-builtins is only supported for a specific version of rustc). A Cargo.lock should enable rustc to pin `compiler-builtins`, I imagine.
>>
>>> you can likely manually achieve such a setup by downloading the rustc
>>> source package and modifying it to build a toolchain and libstd for
>>> your desired target.
>>
>> If this is required maybe debian should be shipping for way more platforms?
> 
> That's not really possible/in scope for Debian..

I don't see why? Debian already ships libstd-rust-dev-windows as well as gcc packages for tons of 
random targets, but really I guess this is just #989844, then.

Thanks again for you work maintaining rust for debian!