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Auto merge of rust-lang#118071 - Urgau:check-cfg-cargo-feature, r=petrochenkov
Remove `feature` from the list of well known check-cfg name This PR removes `feature` from the list of well known check-cfg. This is done for multiple reasons: - Cargo is the source of truth, rustc shouldn't have any knowledge of it - It creates a conflict between Cargo and rustc when there are no features defined. In this case Cargo won't pass any `--check-cfg` for `feature` since no feature will ever be passed, but rustc by having in it's list adds a implicit `cfg(feature, values(any()))` which is completely wrong. Having any cfg `feature` is unexpected not allow any `feature` value. While doing this, I took the opportunity to specialise the diagnostic a bit for the case above. r? `@petrochenkov`
2 parents cc4bb0d + 54c122e commit 855c683

15 files changed

+80
-19
lines changed

‎compiler/rustc_lint/src/context.rs‎

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@@ -739,6 +739,8 @@ pub trait LintContext {
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} else {
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db.span_suggestion(name_span, "there is a config with a similar name", best_match, Applicability::MaybeIncorrect);
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}
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} else if name == sym::feature && std::env::var_os("CARGO").is_some() {
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db.help("consider defining some features in `Cargo.toml`");
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} else if !possibilities.is_empty() {
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let mut possibilities = possibilities.iter()
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.map(Symbol::as_str)

‎compiler/rustc_session/src/config.rs‎

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@@ -1443,9 +1443,8 @@ impl CheckCfg {
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let relocation_model_values = RelocModel::all();
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// Unknown possible values:
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// - `feature`
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// - `target_feature`
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for name in [sym::feature, sym::target_feature] {
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for name in [sym::target_feature] {
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self.expecteds.entry(name).or_insert(ExpectedValues::Any);
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}
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‎src/bootstrap/src/bin/rustc.rs‎

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@@ -114,7 +114,7 @@ fn main() {
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{
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cmd.arg("-Ztls-model=initial-exec");
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}
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} else {
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} else if std::env::var("MIRI").is_err() {
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// Find any host flags that were passed by bootstrap.
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// The flags are stored in a RUSTC_HOST_FLAGS variable, separated by spaces.
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if let Ok(flags) = std::env::var("RUSTC_HOST_FLAGS") {

‎tests/ui/check-cfg/allow-same-level.stderr‎

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@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `FALSE`
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LL | #[cfg(FALSE)]
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| ^^^^^
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|
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= note: `#[warn(unexpected_cfgs)]` on by default
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warning: 1 warning emitted

‎tests/ui/check-cfg/cargo-feature.rs‎

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@@ -0,0 +1,14 @@
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// This test checks that when no features are passed by Cargo we
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// suggest adding some in the Cargo.toml instead of vomitting a
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// list of all the expected names
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//
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// check-pass
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// rustc-env:CARGO=/usr/bin/cargo
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// compile-flags: --check-cfg=cfg() -Z unstable-options
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// error-pattern:Cargo.toml
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#[cfg(feature = "serde")]
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//~^ WARNING unexpected `cfg` condition name
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fn ser() {}
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fn main() {}

‎tests/ui/check-cfg/cargo-feature.stderr‎

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@@ -0,0 +1,11 @@
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warning: unexpected `cfg` condition name: `feature`
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--> $DIR/cargo-feature.rs:10:7
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|
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LL | #[cfg(feature = "serde")]
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| ^^^^^^^^^^^^^^^^^
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|
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= help: consider defining some features in `Cargo.toml`
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= note: `#[warn(unexpected_cfgs)]` on by default
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warning: 1 warning emitted
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‎tests/ui/check-cfg/compact-names.stderr‎

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@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `target_architecture`
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LL | #[cfg(target(os = "linux", architecture = "arm"))]
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| ^^^^^^^^^^^^^^^^^^^^
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|
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= note: `#[warn(unexpected_cfgs)]` on by default
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warning: 1 warning emitted

‎tests/ui/check-cfg/exhaustive-names-values.empty_cfg.stderr‎

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@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
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LL | #[cfg(unknown_key = "value")]
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| ^^^^^^^^^^^^^^^^^^^^^
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|
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= note: `#[warn(unexpected_cfgs)]` on by default
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warning: unexpected `cfg` condition value: `value`
@@ -17,5 +17,17 @@ LL | #[cfg(test = "value")]
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|
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= note: no expected value for `test`
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warning: 2 warnings emitted
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warning: unexpected `cfg` condition name: `feature`
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--> $DIR/exhaustive-names-values.rs:19:7
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|
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LL | #[cfg(feature = "unk")]
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| ^^^^^^^^^^^^^^^
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warning: unexpected `cfg` condition name: `feature`
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--> $DIR/exhaustive-names-values.rs:26:7
28+
|
29+
LL | #[cfg(feature = "std")]
30+
| ^^^^^^^^^^^^^^^
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warning: 4 warnings emitted
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‎tests/ui/check-cfg/exhaustive-names-values.empty_names_values.stderr‎

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@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
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LL | #[cfg(unknown_key = "value")]
55
| ^^^^^^^^^^^^^^^^^^^^^
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|
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= help: expected names are: `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `unix`, `windows`
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= note: `#[warn(unexpected_cfgs)]` on by default
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1010
warning: unexpected `cfg` condition value: `value`
@@ -17,5 +17,17 @@ LL | #[cfg(test = "value")]
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|
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= note: no expected value for `test`
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warning: 2 warnings emitted
20+
warning: unexpected `cfg` condition name: `feature`
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--> $DIR/exhaustive-names-values.rs:19:7
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|
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LL | #[cfg(feature = "unk")]
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| ^^^^^^^^^^^^^^^
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warning: unexpected `cfg` condition name: `feature`
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--> $DIR/exhaustive-names-values.rs:26:7
28+
|
29+
LL | #[cfg(feature = "std")]
30+
| ^^^^^^^^^^^^^^^
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warning: 4 warnings emitted
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‎tests/ui/check-cfg/exhaustive-names-values.rs‎

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@@ -17,11 +17,15 @@ pub fn f() {}
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pub fn f() {}
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1919
#[cfg(feature = "unk")]
20-
//[feature]~^ WARNING unexpected `cfg` condition value
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//[full]~^^ WARNING unexpected `cfg` condition value
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//[empty_names_values]~^ WARNING unexpected `cfg` condition name
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//[empty_cfg]~^^ WARNING unexpected `cfg` condition name
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//[feature]~^^^ WARNING unexpected `cfg` condition value
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//[full]~^^^^ WARNING unexpected `cfg` condition value
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pub fn feat() {}
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#[cfg(feature = "std")]
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//[empty_names_values]~^ WARNING unexpected `cfg` condition name
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//[empty_cfg]~^^ WARNING unexpected `cfg` condition name
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pub fn feat() {}
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#[cfg(windows)]

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