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Wire up unstable rustc --check-cfg to rustdoc #94154

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merged 2 commits into from
Feb 25, 2022

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@Urgau Urgau commented Feb 19, 2022

This pull-request wire up the new unstable --check-cfg option from rustc to rustdoc as requested in the pull-request that introduce --check-cfg.

The motivation was describe in the original PR by @jyn514 who wrote #89346 (comment):

add plumbing to pass --check-cfg from rustdoc (do we want this one?)

It would be useful, I think, it catches issues like cfg(doctst) or something (and in general I would like expansion to match rustc as closely as possible).

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r? @GuillaumeGomez

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 19, 2022
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@rustbot rustbot added the T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. label Feb 19, 2022
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Urgau commented Feb 19, 2022

This was a weird! Simply doing this ./x.py test --stage 1 src/test/rustdoc-ui/check-cfg-test.rs made the test pass but not on CI (what ?).

I had to manually had some extra normalizations (based on other rustdoc test) to make it fail locally. I think it will now pass on CI as well.

// normalize-stderr-test: "src/test/rustdoc-ui" -> "$$DIR"
// normalize-stdout-test: "src/test/rustdoc-ui" -> "$$DIR"

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GuillaumeGomez commented Feb 20, 2022

Can you also add it into the rustdoc book please?

Also cc @petrochenkov @camelid

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camelid commented Feb 20, 2022

I don't have context for this change, but I don't think it's really necessary to discuss it now since it's unstable?

bors added a commit to rust-lang/cargo that referenced this pull request Feb 22, 2022
Add -Z check-cfg-features to enable compile-time checking of features

This pull-request implements the "[Cargo support](https://rust-lang.github.io/rfcs/3013-conditional-compilation-checking.html#cargo-support)" section of [RFC 3013: Checking conditional compilation at compile time](https://rust-lang.github.io/rfcs/3013-conditional-compilation-checking.html#checking-conditional-compilation-at-compile-time).

The support is added in the form of an new unstable flags: `-Z check-cfg-features` that pass all possible features of a package to
`rustc` unstable `--check-cfg` command line as `--check-cfg=values(feature, ...)`. This enables compile time checking of `feature` values in `#[cfg]`, `cfg!` and `#[cfg_attr]`.

This new flag currently only affects `rustc` but `rustdoc` support will be added as soon as [it's support](rust-lang/rust#94154) is merged.

Note than the intent is that this command line options become the default when stabilizing as suggested in the RFC:
> [..] it seems uncontroversial for Cargo to enable checking for feature = "..." values immediately [..]
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Thanks!

@bors: r+

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bors commented Feb 25, 2022

📌 Commit a31ae15 has been approved by GuillaumeGomez

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 25, 2022
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Feb 25, 2022
…eGomez

Wire up unstable rustc --check-cfg to rustdoc

This pull-request wire up the new unstable `--check-cfg` option from `rustc` to `rustdoc` as [requested](rust-lang#93915 (comment)) in the [pull-request](rust-lang#93915) that introduce `--check-cfg`.

The motivation was describe in the original PR by `@jyn514` who wrote rust-lang#89346 (comment):
> > add plumbing to pass --check-cfg from rustdoc (do we want this one?)
>
> It would be useful, I think, it catches issues like cfg(doctst) or something (and in general I would like expansion to match rustc as closely as possible).
This was referenced Feb 25, 2022
bors added a commit to rust-lang-ci/rust that referenced this pull request Feb 25, 2022
…askrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang#93850 (Don't ICE when an extern static is too big for the current architecture)
 - rust-lang#94154 (Wire up unstable rustc --check-cfg to rustdoc)
 - rust-lang#94353 (Fix debug_assert in unused lint pass)
 - rust-lang#94366 (Add missing item to release notes)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit ed202b8 into rust-lang:master Feb 25, 2022
@rustbot rustbot added this to the 1.61.0 milestone Feb 25, 2022
bors added a commit to rust-lang/cargo that referenced this pull request Feb 27, 2022
Add -Z check-cfg-features support for rustdoc

This PR is a follow to #10408 where support for compile-time checking of features was implemented for `rustc`.

At the time `rustdoc` support wasn't yet merged, but now that it has been [merged](rust-lang/rust#94154), this pull-request add support for it in the `doc` and `test --doc` (doctest) mode.

r? `@alexcrichton`
@Urgau Urgau deleted the rustdoc-check-cfg branch May 5, 2023 16:46
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