Rollup merge of #135927 - azhogin:azhogin/retpoline, r=davidtwco

retpoline and retpoline-external-thunk flags (target modifiers) to enable retpoline-related target features

`-Zretpoline` and `-Zretpoline-external-thunk` flags are target modifiers (tracked to be equal in linked crates).
* Enables target features for `-Zretpoline-external-thunk`:
`+retpoline-external-thunk`, `+retpoline-indirect-branches`, `+retpoline-indirect-calls`.
* Enables target features for `-Zretpoline`:
`+retpoline-indirect-branches`, `+retpoline-indirect-calls`.

It corresponds to clang -mretpoline & -mretpoline-external-thunk flags.

Also this PR forbids to specify those target features manually (warning).

Issue: rust-lang/rust#116852

1 files changed, 0 insertions, 17 deletions

diff --git a/compiler/rustc_codegen_llvm/src/errors.rs b/compiler/rustc_codegen_llvm/src/errors.rs
index eaafc680712..8bc74fbec7e 100644
--- a/compiler/rustc_codegen_llvm/src/errors.rs
+++ b/compiler/rustc_codegen_llvm/src/errors.rs
@@ -24,23 +24,6 @@ pub(crate) struct UnknownCTargetFeature<'a> {
     pub rust_feature: PossibleFeature<'a>,
 }
 
-#[derive(Diagnostic)]
-#[diag(codegen_llvm_unstable_ctarget_feature)]
-#[note]
-pub(crate) struct UnstableCTargetFeature<'a> {
-    pub feature: &'a str,
-}
-
-#[derive(Diagnostic)]
-#[diag(codegen_llvm_forbidden_ctarget_feature)]
-#[note]
-#[note(codegen_llvm_forbidden_ctarget_feature_issue)]
-pub(crate) struct ForbiddenCTargetFeature<'a> {
-    pub feature: &'a str,
-    pub enabled: &'a str,
-    pub reason: &'a str,
-}
-
 #[derive(Subdiagnostic)]
 pub(crate) enum PossibleFeature<'a> {
     #[help(codegen_llvm_possible_feature)]