It is now required to provide a resource compiler on windows when
compiling rust. This allows toolchain builders to explicitly provide a
path to an alternative, such as llvm-rc, instead of the one that's
provided by the Windows SDK.
Do not use `git -C dir`
Older versions of git (≤ 1.8.5) do not support the `-C dir` global option. Use the `cwd` optional argument when using Python's `subprocess` functionality instead.
Fixrust-lang/rust#142534
Make llvm_enzyme a regular cargo feature
This makes it clearer that it is set by the build system rather than by the rustc that compiles the current rustc. It also avoids bootstrap needing to pass `--check-cfg llvm_enzyme` to rustc.
Add parallel-frontend-threads to bootstrap.toml and enable multi-threaded parallel compilation
Add the option to use the parallel compiler when building Rust code in bootstrap.
Update the minimum external LLVM to 20
With this change, we'll have stable support for LLVM 20 and 21.
For reference, the previous increase to LLVM 19 was rust-lang/rust#139275.
cc ```@rust-lang/wg-llvm```
r? nikic
Older versions of git (≤ 1.8.5) do not support the `-C dir` global
option. Use the `cwd` optional argument when using Python's
`subprocess` functionality instead.
bootstrap: emit hint if a config key is used in the wrong section
based on discussion on rust-lang/rust#146591
now, if the user puts `build.download-rustc` in `bootstrap.toml`, they'll get a diagnostic:
``hint: try moving `download-rustc` to the `rust` section``
and if they nest things too much (`rust.rust.download-rustc`):
``hint: section name `rust` used as a key within a section``
if they specify a top-level key within a section (`rust.profile`):
``hint: try using `profile` as a top level key``
r? `@Kobzol`
bootstrap: lower verbosity of cargo to one less than bootstrap's
the main thing this does is eliminate the "Fresh ..." output when `--verbose` is only passed once.
r? `@Kobzol`
improve internal bootstrap docs
Mainly focused on making it easier to figure out how tools get built without having to read the `bootstrap_tool!` macro, but also added some subdirs of `build/` to the readme.
bootstrap.py: disable incremental build for bootstrap in CI
locally this seems to save a quarter of a second per build of bootstrap, presumably mainly because it avoids writing 280MB to disk. unsure if this is worth two extra lines of python, i'll let t-bootstrap decide.
This makes it clearer that it is set by the build system rather than by
the rustc that compiles the current rustc. It also avoids bootstrap
needing to pass --check-cfg llvm_enzyme to rustc.
bootstrap: rustdoc-js tests can now be filtered by js files
Before, a command like `./x test tests/rustdoc-js/path-ordering.js` would succeed, but run no tests, since the names of the tests are based on the `.rs` file. This is a bit confusing, as the `rustdoc-js-std` test suite only has `.js` files, and thus those are the files you filter on. Now, `./x test tests/rustdoc-js/path-ordering.js` will be treated as an alias for `./x test tests/rustdoc-js/path-ordering.rs`. This is fairly simple as each `rustdoc-js` test has 2 files, 1 js file and one rust file, each with an identical base filename, so all we need to do is swap the extension.
r? `@Kobzol`
Add --print target-spec-json-schema
This schema is helpful for people writing custom target spec JSON. It can provide autocomplete in the editor, and also serves as documentation when there are documentation comments on the structs, as `schemars` will put them in the schema.
I was motivated to do this because I saw someone write their own version of this schema by hand, so demand for this clearly exists. It's not a lot of effort to implement, so I thought it would make sense.
MCP: https://github.com/rust-lang/compiler-team/issues/905
I think it would also be useful to put this in the sysroot in `etc` so people can link it directly in their editors.
I would have loved to add a test that validates the JSON schema against the spec JSON of every builtin target, but I don't want to do it as the JSON schema validation crates have incredible amounts of dependencies because JSON schema supports a ton of random features. I don't want to add that, even as a dev dependency.
bootstrap: Build jemalloc for LoongArch with support for 16K pages
By default, jemalloc is configured with a 4K page size. If the host’s page size is larger than this, it will crash at runtime. This patch raises the page size to 16K.
This schema is helpful for people writing custom target spec JSON. It
can provide autocomplete in the editor, and also serves as documentation
when there are documentation comments on the structs, as `schemars` will
put them in the schema.
By default, jemalloc is configured with a 4K page size. If the
host’s page size is larger than this, it will crash at runtime.
This patch raises the page size to 16K.
compiler: Add Windows resources to rustc-main and rustc_driver
Adds Windows resources with the rust version information to rustc-main.exe and rustc_driver.dll
Invokes `rc.exe` directly, rather than using one of the crates from the ecosystem to avoid adding dependencies.
A new internal `rustc_windows_rc` crate has the common build script machinery for locating `rc.exe` and constructing the resource script
fix: offline rustdoc html missing favicon
As discussed in the rust-lang/rust#146149 the doc was missing the favicon icon when build locally and viewed on a browser. I changed the relative path and also now we explicitly copy both SVG and PNG.
<img width="1132" height="425" alt="Screenshot 2025-09-03 at 11 57 46 PM" src="https://github.com/user-attachments/assets/062cbb08-04ec-4d88-a43a-710fb6190f82" />
Split `run-make` into two {`run-make`,`run-make-cargo`} test suites
## Summary
Split `tests/run-make` into two test suites, to make it faster and more convenient for contributors to run run-make tests that do not need in-tree `cargo`.
| New test suites | Explanation |
| ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `tests/run-make` | The "fast path" test suite intended for run-make tests that do not need in-tree `cargo`. These tests may not use `cargo`. |
| `tests/run-make-cargo` | The "slow path" test suite that requires checking out `cargo` submodule and building in-tree `cargo`, and thus will have access to in-tree `cargo`. In practice, these constitute a very small portion of the original `run-make` tests. |
This PR carries out [MCP 847: Split run-make test suite into slower-building test suite with suitably-staged cargo and faster-building test suite without cargo](https://github.com/rust-lang/compiler-team/issues/847).
Fixesrust-lang/rust#135573 (for the tests that do not need in-tree `cargo`).
Fixesrust-lang/rust#134109.
## Remarks
- I considered if we want to split by in-tree tools previously. However, as discussed rust-lang/rust#134109, in practice `rustdoc` is not very slow to build, but `cargo` takes a good few minutes. So, the partition boundary was determined to be along in-tree `cargo` availability.
- The `run-make` tests previously that wanted to use `cargo` cannot just use the bootstrap `cargo`, otherwise they would run into situations where bootstrap `cargo` can significantly diverge from in-tree `cargo` (see https://github.com/rust-lang/rust/pull/130642).
---
try-job: aarch64-msvc-1
try-job: test-various
try-job: x86_64-gnu-debug
try-job: aarch64-gnu-debug
try-job: aarch64-apple
try-job: dist-various-1
Adds Windows resources with the rust version information to rustc-main.exe and rustc_driver.dll
Sets the product description to "Rust Compiler" or "Rust Compiler (channel)" for non-stable channels
So that contributors who don't need to run `run-make` tests that require
in-tree `cargo` can run the non-cargo `run-make` tests without having to
wait for `cargo` (which would require rebuilding as the build cache
would be invalidated by compiler modifications without some kind of
`--keep-stage-cargo`).
Add bootstrap.toml option to control debug breaking on ICEs on windows
When rustc ICEs during bootstrap on Windows, it will call `DebugBreak`. This is intended to trigger a Windows Error Reporting dialog that can launch a debugger. However on some setups (mine for one) this will just abort the process, hiding any ICEs on other threads as well. I also would not want to see this dialog even if it did work for me.
This PR adds a new option to bootstrap.toml `rust.break-on-ice` to configure this behavior. By default, it is enabled, matching the existing behavior.
Erick Tryzelaar