Port `print-cfg` run-make test to Rust-based rmake.rs
This PR port the `print-cfg` run-make test to Rust-based rmake.rs tests.
The actual test is now split in two:
- the first part for the `--print=cfg` part
- and the second part for the `=PATH` part of `--print`
Part of #121876.
r? `@jieyouxu`
drop deprecated value `if-available` for `download-ci-llvm` option
It's been 5 months since we deprecated this. It should be fine to drop its support now.
Bootstrap: Check validity of `--target` and `--host` triples before starting a build
Resolves#122128
As described in the issue, validating the `target` and `host` triples would save a lot of time before actually starting a build. This would also check for custom targets by looking for a valid JSON spec if the specified target does not exist in the [supported](42825768b1/compiler/rustc_target/src/spec/mod.rs (L1401-L1689)) list of targets.
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.
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.
`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#112391 problem.
Rollup of 7 pull requests
Successful merges:
- #124370 (Fix substitution parts having a shifted underline in some cases)
- #124394 (Fix ICE on invalid const param types)
- #124425 (Do not ICE on invalid consts when walking mono-reachable blocks)
- #124434 (Remove lazycell and once_cell from compiletest dependencies)
- #124437 (doc: Make the `mod.rs` in the comment point to the correct location)
- #124443 (Elaborate in comment about `statx` probe)
- #124445 (bootstrap: Change `global(true)` to `global = true` for flags for consistency)
r? `@ghost`
`@rustbot` modify labels: rollup
bootstrap: Change `global(true)` to `global = true` for flags for consistency
All other arg properties use the `prop = value` style, which makes it slightly annoying to use the `prop(value)` only style for `global`. Change to `prop = value` also for `global` for consistency.
Remove lazycell and once_cell from compiletest dependencies
Use the standard library `OnceLock` instead of third-party equivalents. A macro is used for the regexes to make their initialization less unwieldy.
miri core/alloc tests: do not test a 2nd target
check-aux seems to be one of the slowest runners since we started running standard library tests in Miri on it. So maybe it'd be better to reduce test coverage a bit by not doing cross-target testing of core and alloc? I don't recall finding target-specific issues in these libraries ever (and we still have the extra test coverage via our [out-of-tree nightly tests](https://github.com/rust-lang/miri-test-libstd)). This gives us more buffer to deal with the fact that the number of tests we run will only grow over time.
Cc `@rust-lang/miri` `@rust-lang/infra`
All other arg properties use the `prop = value` style, which makes it
slightly annoying to use the `prop(value)` style for `global`. Change to
`prop = value` also for `global` for consistency.
