Auto merge of #142770 - tgross35:rollup-w74w39t, r=tgross35

Rollup of 8 pull requests

Successful merges:

 - rust-lang/rust#138291 (rewrite `optimize` attribute to use new attribute parsing infrastructure)
 - rust-lang/rust#140920 (Extract some shared code from codegen backend target feature handling)
 - rust-lang/rust#141990 (Implement send_signal for unix child processes)
 - rust-lang/rust#142668 (vec_deque/fmt/vec tests: remove static mut)
 - rust-lang/rust#142687 (Reduce uses of `hir_crate`.)
 - rust-lang/rust#142699 (Update books)
 - rust-lang/rust#142714 (add comment to `src/bootstrap/build.rs`)
 - rust-lang/rust#142753 (Update library dependencies)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 0 insertions, 59 deletions

diff --git a/compiler/rustc_session/src/features.rs b/compiler/rustc_session/src/features.rs
deleted file mode 100644
index 70a088a236f..00000000000
--- a/compiler/rustc_session/src/features.rs
+++ /dev/null
@@ -1,59 +0,0 @@
-use rustc_target::target_features::Stability;
-
-use crate::Session;
-use crate::errors::{ForbiddenCTargetFeature, UnstableCTargetFeature};
-
-pub trait StabilityExt {
-    /// Returns whether the feature may be toggled via `#[target_feature]` or `-Ctarget-feature`.
-    /// Otherwise, some features also may only be enabled by flag (target modifier).
-    /// (It might still be nightly-only even if this returns `true`, so make sure to also check
-    /// `requires_nightly`.)
-    fn is_toggle_permitted(&self, sess: &Session) -> Result<(), &'static str>;
-
-    /// Check that feature is correctly enabled/disabled by command line flag (emits warnings)
-    fn verify_feature_enabled_by_flag(&self, sess: &Session, enable: bool, feature: &str);
-}
-
-impl StabilityExt for Stability {
-    fn is_toggle_permitted(&self, sess: &Session) -> Result<(), &'static str> {
-        match self {
-            Stability::Forbidden { reason } => Err(reason),
-            Stability::TargetModifierOnly { reason, flag } => {
-                if !sess.opts.target_feature_flag_enabled(*flag) { Err(reason) } else { Ok(()) }
-            }
-            _ => Ok(()),
-        }
-    }
-    fn verify_feature_enabled_by_flag(&self, sess: &Session, enable: bool, feature: &str) {
-        if let Err(reason) = self.is_toggle_permitted(sess) {
-            sess.dcx().emit_warn(ForbiddenCTargetFeature {
-                feature,
-                enabled: if enable { "enabled" } else { "disabled" },
-                reason,
-            });
-        } else if self.requires_nightly().is_some() {
-            // An unstable feature. Warn about using it. It makes little sense
-            // to hard-error here since we just warn about fully unknown
-            // features above.
-            sess.dcx().emit_warn(UnstableCTargetFeature { feature });
-        }
-    }
-}
-
-pub fn retpoline_features_by_flags(sess: &Session, features: &mut Vec<&str>) {
-    // -Zretpoline without -Zretpoline-external-thunk enables
-    // retpoline-indirect-branches and retpoline-indirect-calls target features
-    let unstable_opts = &sess.opts.unstable_opts;
-    if unstable_opts.retpoline && !unstable_opts.retpoline_external_thunk {
-        features.push("+retpoline-indirect-branches");
-        features.push("+retpoline-indirect-calls");
-    }
-    // -Zretpoline-external-thunk (maybe, with -Zretpoline too) enables
-    // retpoline-external-thunk, retpoline-indirect-branches and
-    // retpoline-indirect-calls target features
-    if unstable_opts.retpoline_external_thunk {
-        features.push("+retpoline-external-thunk");
-        features.push("+retpoline-indirect-branches");
-        features.push("+retpoline-indirect-calls");
-    }
-}