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Rollup merge of #141970 - onur-ozkan:skip-stage1-std, r=Kobzol 

implement new `x` flag: `--skip-std-check-if-no-download-rustc`

One of our developers (``@RalfJung)`` [reported](https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/Surprising.20stages.20for.20check.20build.20after.20stage.20reorg/with/521925606)[#t-infra/bootstrap > Surprising stages for check build after stage reorg](https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/Surprising.20stages.20for.20check.20build.20after.20stage.20reorg/with/521925606) that working on both the compiler and the library simultaneously with RA enabled is extremely difficult because checking library creates a heavy load on machines (by building stage1 compiler) on each modification. `--skip-std-check-if-no-download-rustc` flag is intended to reduce this heavy load on their IDE integration as much as possible.

Fixes: rust-lang/rust#141955
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Matthias Krüger 2025-06-05 12:21:34 +02:00 committed by GitHub
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src/building/suggested.md
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@ -59,6 +59,14 @@ always overrides the inner ones.
## Configuring `rust-analyzer` for `rustc`
### Checking the "library" tree
Checking the "library" tree requires a stage1 compiler, which can be a heavy process on some computers.
For this reason, bootstrap has a flag called `--skip-std-check-if-no-download-rustc` that skips checking the
"library" tree if `rust.download-rustc` isn't available. If you want to avoid putting a heavy load on your computer
with `rust-analyzer`, you can add the `--skip-std-check-if-no-download-rustc` flag to your `./x check` command in
the `rust-analyzer` configuration.
### Project-local rust-analyzer setup
`rust-analyzer` can help you check and format your code whenever you save a