Fix `unexpected_cfgs` lint on std #125296

tesuji · 2024-05-19T23:43:10Z

r? rust-lang/compiler

rustbot · 2024-05-19T23:43:17Z

Failed to set assignee to Urgau: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

Noratrieb · 2024-05-20T09:32:05Z

can you find the place in src/bootstrap where it sets the check-cfg for std and attempt to remove it? That would be a simple way to ensure they continue to work.

Urgau · 2024-05-20T09:56:33Z

This is great, thanks.

can you find the place in src/bootstrap where it sets the check-cfg for std and attempt to remove it?

It won't work for now for this repository as we always build with the previous beta Cargo, and it doesn't know about the check-cfg lint config and even if it did it wouldn't take effect yet. So we must still have the corresponding keys in bootstrap:

rust/src/bootstrap/src/lib.rs

Lines 87 to 97 in f092f73

    
           (Some(Mode::Std), "stdarch_intel_sde", None), 
        
           (Some(Mode::Std), "no_fp_fmt_parse", None), 
        
           (Some(Mode::Std), "no_global_oom_handling", None), 
        
           (Some(Mode::Std), "no_rc", None), 
        
           (Some(Mode::Std), "no_sync", None), 
        
           (Some(Mode::Std), "netbsd10", None), 
        
           (Some(Mode::Std), "backtrace_in_libstd", None), 
        
           /* Extra values not defined in the built-in targets yet, but used in std */ 
        
           (Some(Mode::Std), "target_env", Some(&["libnx", "p2"])), 
        
           (Some(Mode::Std), "target_os", Some(&["visionos"])), 
        
           (Some(Mode::Std), "target_arch", Some(&["arm64ec", "spirv", "nvptx", "xtensa"])),

Further more there is currently a warning that is emitted on previous beta Cargo since check-cfg is unused their: warning: /checkout/library/alloc/Cargo.toml: unused manifest key: lints.rust.unexpected_cfgs.check-cfg

We are working on getting this warning removed on beta Cargo, rust-lang/cargo#13925.

Noratrieb · 2024-05-20T11:48:30Z

library/std/Cargo.toml

@@ -82,6 +82,7 @@ system-llvm-libunwind = ["unwind/system-llvm-libunwind"]

 # Make panics and failed asserts immediately abort without formatting any message
 panic_immediate_abort = ["core/panic_immediate_abort", "alloc/panic_immediate_abort"]
+restricted-std = []


this doesn't really make sense as a feature, using a feature = cfg is a bit weird.. could you put it into the check-cfg table instead of the feature here as well?

If it shouldn't be activated by users, then it shouldn't be Cargo feature to begin with, it should just be a normal "custom cfg": restricted_std.

T-cargo is also thinking of disallowing/warning when expecting a fake Cargo feature, https://rust-lang.zulipchat.com/#narrow/stream/246057-t-cargo/topic/.60check-cfg.60.20and.20custom.20.60feature.60

Noratrieb · 2024-05-20T11:50:07Z

I see, makes sense, bootstrapping exists :D. r=me after removing the Cargo feature again.

library/std/Cargo.toml

Urgau · 2024-05-20T12:32:09Z

library/alloc/Cargo.toml

+
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = [


Could you add a comment saying that these check-cfg entries do not yet take effect for rust-lang/rust since we use beta Cargo, but that for users for -Zbuild-std it does take effect and that the unused warning in waiting for rust-lang/cargo#13925 to reach beta.

library/std/Cargo.toml

library/core/Cargo.toml

tesuji · 2024-05-20T15:10:44Z

@rustbot ready

michaelwoerister · 2024-05-21T08:05:38Z

@bors r=Nilstrieb,michaelwoerister

bors · 2024-05-21T08:06:45Z

📌 Commit 1196df8 has been approved by Nilstrieb,michaelwoerister

It is now in the queue for this repository.

src/bootstrap/src/lib.rs

Noratrieb · 2024-05-21T09:35:01Z

@bors r=Nilstrieb,michaelwoerister

bors · 2024-05-21T09:35:04Z

📌 Commit 68a594c has been approved by Nilstrieb,michaelwoerister

It is now in the queue for this repository.

…iaskrgr Rollup of 7 pull requests Successful merges: - rust-lang#124570 (Miscellaneous cleanups) - rust-lang#124772 (Refactor documentation for Apple targets) - rust-lang#125011 (Add opt-for-size core lib feature flag) - rust-lang#125218 (Migrate `run-make/no-intermediate-extras` to new `rmake.rs`) - rust-lang#125225 (Use functions from `crt_externs.h` on iOS/tvOS/watchOS/visionOS) - rust-lang#125266 (compiler: add simd_ctpop intrinsic) - rust-lang#125348 (Small fixes to `std::path::absolute` docs) Failed merges: - rust-lang#125296 (Fix `unexpected_cfgs` lint on std) r? `@ghost` `@rustbot` modify labels: rollup

bors · 2024-05-21T16:18:34Z

☔ The latest upstream changes (presumably #125358) made this pull request unmergeable. Please resolve the merge conflicts.

michaelwoerister · 2024-05-21T18:51:46Z

@bors r=Nilstrieb,michaelwoerister

bors · 2024-05-21T18:51:48Z

📌 Commit 30e0ab8 has been approved by Nilstrieb,michaelwoerister

It is now in the queue for this repository.

Rollup of 5 pull requests Successful merges: - rust-lang#124896 (miri: rename intrinsic_fallback_checks_ub to intrinsic_fallback_is_spec) - rust-lang#125015 (Pattern types: Prohibit generic args on const params) - rust-lang#125049 (Disallow cast with trailing braced macro in let-else) - rust-lang#125259 (An async closure may implement `FnMut`/`Fn` if it has no self-borrows) - rust-lang#125296 (Fix `unexpected_cfgs` lint on std) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#125296 - tesuji:checkcfg-buildstd, r=Nilstrieb,michaelwoerister Fix `unexpected_cfgs` lint on std closes rust-lang#125291 r? rust-lang/compiler

fmease · 2024-05-22T21:49:55Z

bors sleepy @bors r-

bjorn3 · 2024-05-23T12:40:43Z

I'm still getting

warning: unexpected `cfg` condition value: `restricted-std`
   --> library/std/src/lib.rs:216:17
    |
216 | #![cfg_attr(not(feature = "restricted-std"), stable(feature = "rust1", since = "1.0.0"))]
    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: expected values for `feature` are: `addr2line`, `as_crate`, `backtrace`, `compiler-builtins-c`, `compiler-builtins-mangled-names`, `compiler-builtins-mem`, `compiler-builtins-no-asm`, `compiler-builtins-weak-intrinsics`, `llvm-libunwind`, `miniz_oxide`, `object`, `optimize_for_size`, `panic-unwind`, `panic_immediate_abort`, `panic_unwind`, `profiler`, `profiler_builtins`, `std`, `std_detect_dlsym_getauxval`, `std_detect_env_override`, `std_detect_file_io`, and `system-llvm-libunwind`
    = help: consider adding `restricted-std` as a feature in `Cargo.toml`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
    = note: requested on the command line with `-W unexpected-cfgs`

warning: unexpected `cfg` condition value: `restricted-std`
   --> library/std/src/lib.rs:218:5
    |
218 |     feature = "restricted-std",
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: expected values for `feature` are: `addr2line`, `as_crate`, `backtrace`, `compiler-builtins-c`, `compiler-builtins-mangled-names`, `compiler-builtins-mem`, `compiler-builtins-no-asm`, `compiler-builtins-weak-intrinsics`, `llvm-libunwind`, `miniz_oxide`, `object`, `optimize_for_size`, `panic-unwind`, `panic_immediate_abort`, `panic_unwind`, `profiler`, `profiler_builtins`, `std`, `std_detect_dlsym_getauxval`, `std_detect_env_override`, `std_detect_file_io`, and `system-llvm-libunwind`
    = help: consider adding `restricted-std` as a feature in `Cargo.toml`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration

warning: `std` (lib) generated 2 warnings

Urgau · 2024-05-23T12:43:36Z

@bjorn3 that's #125296 (comment), I think it would make sense to switch to restricted_std, if it's not supposed to be a Cargo feature.

… r=bjorn3 Cleanup check-cfg handling in core and std Follow-up to rust-lang#125296 where we: - expect any feature cfg in std, due to `#[path]` imports - move some check-cfg args inside the `build.rs` as per Cargo recommendation - and replace the fake Cargo feature `"restricted-std"` by the custom cfg `restricted_std` Fixes rust-lang#125296 (comment) r? `@bjorn3` (maybe, feel free to re-roll)

Rollup merge of rust-lang#125452 - Urgau:check-cfg-libraries-cleanup, r=bjorn3 Cleanup check-cfg handling in core and std Follow-up to rust-lang#125296 where we: - expect any feature cfg in std, due to `#[path]` imports - move some check-cfg args inside the `build.rs` as per Cargo recommendation - and replace the fake Cargo feature `"restricted-std"` by the custom cfg `restricted_std` Fixes rust-lang#125296 (comment) r? `@bjorn3` (maybe, feel free to re-roll)

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 19, 2024

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matthiaskrgr mentioned this pull request May 21, 2024

Rollup of 7 pull requests #125358

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fmease mentioned this pull request May 21, 2024

Rollup of 6 pull requests #125372

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bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 21, 2024

tesuji added 5 commits May 21, 2024 18:17

Update check-cfg lists for core

63fe640

Update check-cfg lists for alloc

0734ae2

Update check-cfg lists for std

73602bf

addresss reviews

c7d2f45

tidy alphabetica

df3a320

maybe replace check-cfg values in bootstrap with ones in Cargo.toml

30e0ab8

tesuji force-pushed the checkcfg-buildstd branch from 68a594c to 30e0ab8 Compare May 21, 2024 18:19

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fmease mentioned this pull request May 22, 2024

Rollup of 5 pull requests #125415

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Urgau mentioned this pull request May 22, 2024

Tons of unexpected_cfgs failures in portable-simd and backtrace doctests #124740

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Cleanup check-cfg handling in core and std #125452

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Cleanup bootstrap check-cfg #127026

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Fix `unexpected_cfgs` lint on std #125296

Fix `unexpected_cfgs` lint on std #125296

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Fix unexpected_cfgs lint on std #125296

Fix unexpected_cfgs lint on std #125296

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Fix `unexpected_cfgs` lint on std #125296

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