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`rustc` wanted features & bugfixes

Note: there is the "A-rust-for-linux" label in the rust repository: https://github.com/rust-lang/rust/labels/A-rust-for-linux.

Features that we would like to see

Required (we almost certainly want them)

Nice to have (not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

  • --check mode / --emit=check.
    • Like cargo check, but for rustc.
    • cargo check appears to do --emit=dep-info,metadata, but that would not be needed for the leaves.
    • Currently, the best approximation appears to be --emit=metadata, but it would be nice to have a way that reduces the work to the minimum, at least avoiding to emit the metadata and temporaries.
    • --emit=metadata=/dev/null does not appear to work due to the generated temporaries (and -Ztemps-dir does not seem to change that).
    • Use case: some tests (e.g. in upstream Rust: the warning-free builds of core and alloc under no_global_oom_handling in rustc) and faster development (it could also be part of a dev-mode in the kernel, which could include other changes like disabling the missing documentation warning).
    • From: Add test for warning-free builds of core under no_global_oom_handling rust-lang/rust#110652.

Done (stabilized, fixed, not needed anymore, etc.)

Bugs that we would like to see fixed

Required (we almost certainly want them)

Nice to have (probably not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

Done (stabilized, fixed, or not needed anymore, etc.)