Update `unexpected_cfgs` lint for Cargo new `check-cfg` config

4 files changed, 57 insertions, 27 deletions

diff --git a/compiler/rustc_lint/src/context/diagnostics/check_cfg.rs b/compiler/rustc_lint/src/context/diagnostics/check_cfg.rs
index 3c423b4e2aa..72cb1dac938 100644
--- a/compiler/rustc_lint/src/context/diagnostics/check_cfg.rs
+++ b/compiler/rustc_lint/src/context/diagnostics/check_cfg.rs
@@ -164,13 +164,14 @@ pub(super) fn unexpected_cfg_name(
 
     if is_from_cargo {
         if !is_feature_cfg {
-            diag.help(format!("consider using a Cargo feature instead or adding `println!(\"cargo::rustc-check-cfg={inst}\");` to the top of the `build.rs`"));
+            diag.help(format!("consider using a Cargo feature instead"));
+            diag.help(format!("or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:\n [lints.rust]\n unexpected_cfgs = {{ level = \"warn\", check-cfg = [\"{inst}\"] }}"));
+            diag.help(format!("or consider adding `println!(\"cargo::rustc-check-cfg={inst}\");` to the top of the `build.rs`"));
         }
-        diag.note("see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration");
     } else {
         diag.help(format!("to expect this configuration use `--check-cfg={inst}`"));
-        diag.note("see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration");
     }
+    diag.note("see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration");
 }
 
 pub(super) fn unexpected_cfg_value(
@@ -266,13 +267,14 @@ pub(super) fn unexpected_cfg_value(
                 diag.help("consider defining some features in `Cargo.toml`");
             }
         } else if !is_cfg_a_well_know_name {
-            diag.help(format!("consider using a Cargo feature instead or adding `println!(\"cargo::rustc-check-cfg={inst}\");` to the top of the `build.rs`"));
+            diag.help(format!("consider using a Cargo feature instead"));
+            diag.help(format!("or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:\n [lints.rust]\n unexpected_cfgs = {{ level = \"warn\", check-cfg = [\"{inst}\"] }}"));
+            diag.help(format!("or consider adding `println!(\"cargo::rustc-check-cfg={inst}\");` to the top of the `build.rs`"));
         }
-        diag.note("see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration");
     } else {
         if !is_cfg_a_well_know_name {
             diag.help(format!("to expect this configuration use `--check-cfg={inst}`"));
         }
-        diag.note("see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration");
     }
+    diag.note("see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration");
 }
diff --git a/tests/ui/check-cfg/cargo-feature.none.stderr b/tests/ui/check-cfg/cargo-feature.none.stderr
index 627f03ddf55..8523274d329 100644
--- a/tests/ui/check-cfg/cargo-feature.none.stderr
+++ b/tests/ui/check-cfg/cargo-feature.none.stderr
@@ -6,7 +6,7 @@ LL | #[cfg(feature = "serde")]
    |
    = note: no expected values for `feature`
    = help: consider adding `serde` as a feature in `Cargo.toml`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: (none)
@@ -17,7 +17,7 @@ LL | #[cfg(feature)]
    |
    = note: no expected values for `feature`
    = help: consider defining some features in `Cargo.toml`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `tokio_unstable`
   --> $DIR/cargo-feature.rs:22:7
@@ -26,8 +26,12 @@ LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
    = help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `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`, `ub_checks`, `unix`, `windows`
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(tokio_unstable)");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(tokio_unstable)"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(tokio_unstable)");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `CONFIG_NVME`
   --> $DIR/cargo-feature.rs:26:7
@@ -35,8 +39,12 @@ warning: unexpected `cfg` condition name: `CONFIG_NVME`
 LL | #[cfg(CONFIG_NVME = "m")]
    |       ^^^^^^^^^^^^^^^^^
    |
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(CONFIG_NVME, values(\"m\"))");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(CONFIG_NVME, values(\"m\"))"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(CONFIG_NVME, values(\"m\"))");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: 4 warnings emitted
 
diff --git a/tests/ui/check-cfg/cargo-feature.some.stderr b/tests/ui/check-cfg/cargo-feature.some.stderr
index 9cc5fb6aca0..67aab27fc6e 100644
--- a/tests/ui/check-cfg/cargo-feature.some.stderr
+++ b/tests/ui/check-cfg/cargo-feature.some.stderr
@@ -6,7 +6,7 @@ LL | #[cfg(feature = "serde")]
    |
    = note: expected values for `feature` are: `bitcode`
    = help: consider adding `serde` as a feature in `Cargo.toml`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value: (none)
@@ -17,7 +17,7 @@ LL | #[cfg(feature)]
    |
    = note: expected values for `feature` are: `bitcode`
    = help: consider defining some features in `Cargo.toml`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `tokio_unstable`
   --> $DIR/cargo-feature.rs:22:7
@@ -26,8 +26,12 @@ LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
    = help: expected names are: `CONFIG_NVME`, `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `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`, `ub_checks`, `unix`, `windows`
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(tokio_unstable)");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(tokio_unstable)"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(tokio_unstable)");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition value: `m`
   --> $DIR/cargo-feature.rs:26:7
@@ -38,8 +42,12 @@ LL | #[cfg(CONFIG_NVME = "m")]
    |                     help: there is a expected value with a similar name: `"y"`
    |
    = note: expected values for `CONFIG_NVME` are: `y`
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(CONFIG_NVME, values(\"m\"))");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(CONFIG_NVME, values(\"m\"))"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(CONFIG_NVME, values(\"m\"))");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: 4 warnings emitted
 
diff --git a/tests/ui/check-cfg/diagnotics.cargo.stderr b/tests/ui/check-cfg/diagnotics.cargo.stderr
index 1b7505682da..79a4a30d091 100644
--- a/tests/ui/check-cfg/diagnotics.cargo.stderr
+++ b/tests/ui/check-cfg/diagnotics.cargo.stderr
@@ -5,7 +5,7 @@ LL | #[cfg(featur)]
    |       ^^^^^^ help: there is a config with a similar name: `feature`
    |
    = help: expected values for `feature` are: `foo`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition name: `featur`
@@ -14,7 +14,7 @@ warning: unexpected `cfg` condition name: `featur`
 LL | #[cfg(featur = "foo")]
    |       ^^^^^^^^^^^^^^
    |
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 help: there is a config with a similar name and value
    |
 LL | #[cfg(feature = "foo")]
@@ -27,7 +27,7 @@ LL | #[cfg(featur = "fo")]
    |       ^^^^^^^^^^^^^
    |
    = help: expected values for `feature` are: `foo`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 help: there is a config with a similar name and different values
    |
 LL | #[cfg(feature = "foo")]
@@ -39,8 +39,12 @@ warning: unexpected `cfg` condition name: `no_value`
 LL | #[cfg(no_value)]
    |       ^^^^^^^^ help: there is a config with a similar name: `no_values`
    |
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(no_value)");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(no_value)"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(no_value)");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: unexpected `cfg` condition name: `no_value`
   --> $DIR/diagnotics.rs:27:7
@@ -48,8 +52,12 @@ warning: unexpected `cfg` condition name: `no_value`
 LL | #[cfg(no_value = "foo")]
    |       ^^^^^^^^^^^^^^^^
    |
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(no_value, values(\"foo\"))");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(no_value, values(\"foo\"))"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(no_value, values(\"foo\"))");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 help: there is a config with a similar name and no value
    |
 LL | #[cfg(no_values)]
@@ -64,8 +72,12 @@ LL | #[cfg(no_values = "bar")]
    |                help: remove the value
    |
    = note: no expected value for `no_values`
-   = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(no_values, values(\"bar\"))");` to the top of the `build.rs`
-   = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
+   = help: consider using a Cargo feature instead
+   = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
+            [lints.rust]
+            unexpected_cfgs = { level = "warn", check-cfg = ["cfg(no_values, values(\"bar\"))"] }
+   = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(no_values, values(\"bar\"))");` to the top of the `build.rs`
+   = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 
 warning: 6 warnings emitted