docs: autogenerate compiler flag stubs based on -Zhelp by rmehri01 · Pull Request #142135 · rust-lang/rust

rmehri01 · 2025-06-07T01:53:32Z

Adds autogenerated compiler flag stubs to the unstable book by building rustc, passing it's path to unstable-book-gen, and using that to call the compiler with -Zhelp and create a similar Features that is used for library and lang stubs.

Example:

# `combine_cgu`

combine CGUs into a single one

This feature has no tracking issue, and is therefore likely internal to the compiler, not being intended for general use.

------------------------

Closes #141525

rustbot · 2025-06-07T01:53:36Z

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workingjubilee · 2025-06-07T02:14:13Z

r? compiler

lcnr · 2025-06-10T13:25:50Z

r? compiler

compiler-errors · 2025-06-11T23:25:00Z

@bors r+

bors · 2025-06-11T23:25:04Z

📌 Commit 2cfd494 has been approved by compiler-errors

It is now in the queue for this repository.

…piler-errors docs: autogenerate compiler flag stubs based on -Zhelp Adds autogenerated compiler flag stubs to the unstable book by building rustc, passing it's path to `unstable-book-gen`, and using that to call the compiler with `-Zhelp` and create a similar `Features` that is used for library and lang stubs. Example: ```md # `combine_cgu` combine CGUs into a single one This feature has no tracking issue, and is therefore likely internal to the compiler, not being intended for general use. ------------------------ ``` Closes rust-lang#141525

Rollup of 9 pull requests Successful merges: - #138016 (Added `Clone` implementation for `ChunkBy`) - #140770 (add `extern "custom"` functions) - #141162 (refactor `AttributeGate` and `rustc_attr!` to emit notes during feature checking) - #141474 (Add `ParseMode::Diagnostic` and fix multiline spans in diagnostic attribute lints) - #141947 (Specify that "option-like" enums must be `#[repr(Rust)]` to be ABI-compatible with their non-1ZST field.) - #142135 (docs: autogenerate compiler flag stubs based on -Zhelp) - #142252 (Improve clarity of `core::sync::atomic` docs about "Considerations" in regards to CAS operations) - #142337 (miri: add flag to suppress float non-determinism) - #142353 (compiler: Ease off the accelerator on `unsupported_calling_conventions`) r? `@ghost` `@rustbot` modify labels: rollup

matthiaskrgr · 2025-06-12T11:30:17Z

@bors r-
guess this failed here #142399 (comment)

alex-semenyuk · 2025-08-09T19:45:34Z

@rmehri01
Thanks for your contribution.
Form wg-triage. Any updates on this PR?

rmehri01 · 2025-08-09T20:17:44Z

@rmehri01 Thanks for your contribution. Form wg-triage. Any updates on this PR?

Hey! Sorry I'm not exactly sure what went wrong here, it seems like it has to do something with getting the output of -Zhelp on aarch64 windows, is there something else we should try instead?

Edit: nvm I think I messed up the host argument to builder.compiler

bors · 2025-08-10T18:29:12Z

☔ The latest upstream changes (presumably #145210) made this pull request unmergeable. Please resolve the merge conflicts.

bors · 2025-08-11T09:47:17Z

☔ The latest upstream changes (presumably #145011) made this pull request unmergeable. Please resolve the merge conflicts.

compiler-errors · 2025-08-14T17:03:37Z

r? bootstrap

Mark-Simulacrum · 2025-08-21T01:22:34Z


+fn collect_compiler_flags(rustc_path: impl AsRef<Path>) -> Features {
+    let mut rustc = Command::new(rustc_path.as_ref());
+    rustc.arg("-Zhelp");


Rather than running -Zhelp and then trying to parse that, maybe we can parse the options! macro (

rust/compiler/rustc_session/src/options.rs

Line 2116 in 040a98a

options! {

)? I think that has all the -Z flags. That would also give you a file/line to link to. I'm not sure how valuable that is, but if it is, that seems like the way to get that information.

I'm OK with sticking with -Z/-C parsing since the syntax is both fairly simple and controlled by us, though.

We'd likely also want (perhaps in a separate PR) to enforce that all the -C flags in codegen options (also in the linked file) have documentation in the non-unstable book. That could be done in tidy.

It would probably be nice to have the file/line to link to, do you mean just literally reading and parsing the rust source file to do that or is there a better way to go about it?

bors · 2025-09-21T17:05:28Z

☔ The latest upstream changes (presumably #146592) made this pull request unmergeable. Please resolve the merge conflicts.

…by789 Autogenerate unstable compiler flag stubs for unstable-book Closes rust-lang#141525. Based on old PR rust-lang#142135. Parses `rustc -Zhelp` to generate doc stubs for unstable compiler flags if any are missing.

Rollup merge of #157626 - kohsine:autogen-flag-stubs, r=clubby789 Autogenerate unstable compiler flag stubs for unstable-book Closes #141525. Based on old PR #142135. Parses `rustc -Zhelp` to generate doc stubs for unstable compiler flags if any are missing.

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Jun 7, 2025

rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jun 7, 2025

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rmehri01 force-pushed the gen-compiler-flags branch from 42a4c2d to 2cfd494 Compare June 7, 2025 02:26

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workingjubilee mentioned this pull request Jun 12, 2025

Rollup of 15 pull requests #142396

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workingjubilee mentioned this pull request Jun 12, 2025

Rollup of 15 pull requests #142397

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matthiaskrgr mentioned this pull request Jun 12, 2025

Rollup of 9 pull requests #142399

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rmehri01 force-pushed the gen-compiler-flags branch from 0e7711e to 8e0034d Compare August 10, 2025 18:42

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rmehri01 force-pushed the gen-compiler-flags branch 2 times, most recently from d633a45 to 91ee21b Compare August 10, 2025 19:42

rmehri01 force-pushed the gen-compiler-flags branch from 91ee21b to 3104e57 Compare August 11, 2025 12:53

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Ryan Mehri added 2 commits August 23, 2025 09:03

docs: autogenerate compiler flag stubs based on -Zhelp

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update snapshot tests

41eb772

rmehri01 force-pushed the gen-compiler-flags branch from 3104e57 to 41eb772 Compare August 23, 2025 13:04

rmehri01 closed this Oct 11, 2025

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Oct 11, 2025

jyn514 mentioned this pull request Jan 11, 2026

autogenerate compiler flag stubs in the unstable book #141525

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kohsine mentioned this pull request Jun 8, 2026

Autogenerate unstable compiler flag stubs for unstable-book #157626

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