feat: lints feature

src/cargo/core/compiler/fingerprint/mod.rs

@@ -75,6 +75,7 @@
 //! [`Lto`] flags                              | ✓           | ✓
 //! config settings[^5]                        | ✓           |
 //! is_std                                     |             | ✓
+//! `[lints]` table[^6]                        | ✓           |
 //!
 //! [^1]: Build script and bin dependencies are not included.
 //!
@@ -86,6 +87,8 @@
 //! [^5]: Config settings that are not otherwise captured anywhere else.
 //!       Currently, this is only `doc.extern-map`.
 //!
+//! [^6]: Via [`Manifest::lint_rustflags`][crate::core::Manifest::lint_rustflags]
+//!
 //! When deciding what should go in the Metadata vs the Fingerprint, consider
 //! that some files (like dylibs) do not have a hash in their filename. Thus,
 //! if a value changes, only the fingerprint will detect the change (consider,
@@ -1414,6 +1417,7 @@ fn calculate_normal(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<Finger
         unit.mode,
         cx.bcx.extra_args_for(unit),
         cx.lto[unit],
+        unit.pkg.manifest().lint_rustflags(),
     ));
     // Include metadata since it is exposed as environment variables.
     let m = unit.pkg.manifest().metadata();

src/cargo/core/compiler/mod.rs

@@ -762,6 +762,7 @@ fn rustdoc(cx: &mut Context<'_, '_>, unit: &Unit) -> CargoResult<Work> {
     add_error_format_and_color(cx, &mut rustdoc);
     add_allow_features(cx, &mut rustdoc);
 
+    rustdoc.args(unit.pkg.manifest().lint_rustflags());
     if let Some(args) = cx.bcx.extra_args_for(unit) {
         rustdoc.args(args);
     }
@@ -1040,10 +1041,6 @@ fn build_base_args(
         cmd.arg("-C").arg(&format!("opt-level={}", opt_level));
     }
 
-    if !rustflags.is_empty() {
-        cmd.args(&rustflags);
-    }
-
     if *panic != PanicStrategy::Unwind {
         cmd.arg("-C").arg(format!("panic={}", panic));
     }
@@ -1078,6 +1075,10 @@ fn build_base_args(
         cmd.arg("-C").arg(format!("debuginfo={}", debuginfo));
     }
 
+    cmd.args(unit.pkg.manifest().lint_rustflags());
+    if !rustflags.is_empty() {
+        cmd.args(&rustflags);
+    }
     if let Some(args) = cx.bcx.extra_args_for(unit) {
         cmd.args(args);
     }

src/cargo/core/features.rs

@@ -483,6 +483,9 @@ features! {
 
     // Allow specifying rustflags directly in a profile
     (stable, workspace_inheritance, "1.64", "reference/unstable.html#workspace-inheritance"),
+
+    // Allow specifying rustflags directly in a profile
+    (unstable, lints, "", "reference/unstable.html#lints"),
 }
 
 pub struct Feature {

src/cargo/core/manifest.rs

@@ -63,6 +63,7 @@ pub struct Manifest {
     default_run: Option<String>,
     metabuild: Option<Vec<String>>,
     resolve_behavior: Option<ResolveBehavior>,
+    lint_rustflags: Vec<String>,
 }
 
 /// When parsing `Cargo.toml`, some warnings should silenced
@@ -405,6 +406,7 @@ impl Manifest {
         original: Rc<TomlManifest>,
         metabuild: Option<Vec<String>>,
         resolve_behavior: Option<ResolveBehavior>,
+        lint_rustflags: Vec<String>,
     ) -> Manifest {
         Manifest {
             summary,
@@ -430,6 +432,7 @@ impl Manifest {
             default_run,
             metabuild,
             resolve_behavior,
+            lint_rustflags,
         }
     }
 
@@ -514,6 +517,11 @@ impl Manifest {
         self.resolve_behavior
     }
 
+    /// `RUSTFLAGS` from the `[lints]` table
+    pub fn lint_rustflags(&self) -> &[String] {
+        self.lint_rustflags.as_slice()
+    }
+
     pub fn map_source(self, to_replace: SourceId, replace_with: SourceId) -> Manifest {
         Manifest {
             summary: self.summary.map_source(to_replace, replace_with),