Fixes rust-lang#83085

The description was most accurate when it was still called rustbuild,
and I presume indeed did mostly run in CI. It has become something more
so try to describe it better for current-day usage.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Signed-off-by: onur-ozkan <work@onurozkan.dev>

This makes miri not diverge in behavior, it fixes running Rust linux-gnu
binaries on musl with gcompat, it fixes dlopen edge-cases that cranelift
somehow hits, etc.

…imulacrum

1.78 release notes

cc `@rust-lang/release`

r? `@cuviper`

…crum

`x vendor`

This PR implements `x vendor` on bootstrap; enabling dependency vendoring without the need for developers to have `cargo` installed on their system (previously, we suggested running `cargo vendor ...` but now we can accomplish the same task with `x vendor`).

In addition, fixes rust-lang#112391 problem.

…ce-incr, r=Mark-Simulacrum

add test for incremental ICE: slice-pattern-const.rs rust-lang#83085

Fixes rust-lang#83085

…files-better, r=Mark-Simulacrum

bootstrap: Describe build_steps modules

One of my preferred ways to understand source code is to start with its API. This implies the code is documented reasonably accurately, even if it is a private API. The description of one of these modules had not been updated since 2015 and so was both terse and confusing, so I rewrote it. Then I noticed many others went unremarked, so I offered some remarks.

…rk-Simulacrum

Remove unused `[patch]` for clippy_lints

Looks like it was once used by RLS

…imulacrum

bootstrap: Document `struct Builder` and its fields

I'm exploring the code of bootstrap and had a bit of a hard time understanding exactly what `Builder` is for at first. I decided to help document it and its field to help future explorers.

…nu, r=ChrisDenton

Unconditionally call `really_init` on GNU/Linux

This makes miri not diverge in behavior, it fixes running Rust linux-gnu binaries on musl with gcompat, it fixes dlopen edge-cases that cranelift somehow hits, etc.

Fixes rust-lang#124126

thou hast gazed into this abyss with me:
r? ``@ChrisDenton``