Auto merge of #109335 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum 1.68.1

[stable] 1.68.1 release

This packages up a set of release notes, version bump, and backports of:

* Don't eagerly convert principal to string #108162
*  Revert "enable ThinLTO for rustc on x86_64-pc-windows-msvc dist builds" #109094
*  Create dirs for build_triple #109111
*  Fix linker detection for clang with prefix #109156
*  ci: use apt install --download-only for solaris debs #108951

The last of those is not yet stable-accepted but I expect it to be, we will drop it and rebuild artifacts if we don't actually approve it.

r? `@Mark-Simulacrum`

4 files changed, 12 insertions, 5 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index b148e4185a6..34e042376c1 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -1237,7 +1237,7 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     .and_then(|(lhs, rhs)| rhs.chars().all(char::is_numeric).then_some(lhs))
                     .unwrap_or(stem);
 
-                // GCC can have an optional target prefix.
+                // GCC/Clang can have an optional target prefix.
                 let flavor = if stem == "emcc" {
                     LinkerFlavor::EmCc
                 } else if stem == "gcc"
@@ -1245,7 +1245,9 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) {
                     || stem == "g++"
                     || stem.ends_with("-g++")
                     || stem == "clang"
+                    || stem.ends_with("-clang")
                     || stem == "clang++"
+                    || stem.ends_with("-clang++")
                 {
                     LinkerFlavor::from_cli(LinkerFlavorCli::Gcc, &sess.target)
                 } else if stem == "wasm-ld" || stem.ends_with("-wasm-ld") {
diff --git a/compiler/rustc_lint/src/deref_into_dyn_supertrait.rs b/compiler/rustc_lint/src/deref_into_dyn_supertrait.rs
index dff5a645c17..a45d8156c24 100644
--- a/compiler/rustc_lint/src/deref_into_dyn_supertrait.rs
+++ b/compiler/rustc_lint/src/deref_into_dyn_supertrait.rs
@@ -78,7 +78,7 @@ impl<'tcx> LateLintPass<'tcx> for DerefIntoDynSupertrait {
             });
             cx.emit_spanned_lint(DEREF_INTO_DYN_SUPERTRAIT, cx.tcx.def_span(item.owner_id.def_id), SupertraitAsDerefTarget {
                 t,
-                target_principal: target_principal.to_string(),
+                target_principal,
                 label,
             });
         }
diff --git a/compiler/rustc_lint/src/lints.rs b/compiler/rustc_lint/src/lints.rs
index c997d8945d1..329ece28ef8 100644
--- a/compiler/rustc_lint/src/lints.rs
+++ b/compiler/rustc_lint/src/lints.rs
@@ -8,7 +8,7 @@ use rustc_errors::{
 };
 use rustc_hir::def_id::DefId;
 use rustc_macros::{LintDiagnostic, Subdiagnostic};
-use rustc_middle::ty::{Predicate, Ty, TyCtxt};
+use rustc_middle::ty::{PolyExistentialTraitRef, Predicate, Ty, TyCtxt};
 use rustc_session::parse::ParseSess;
 use rustc_span::{edition::Edition, sym, symbol::Ident, Span, Symbol};
 
@@ -556,8 +556,7 @@ pub struct BuiltinUnexpectedCliConfigValue {
 #[diag(lint_supertrait_as_deref_target)]
 pub struct SupertraitAsDerefTarget<'a> {
     pub t: Ty<'a>,
-    pub target_principal: String,
-    // pub target_principal: Binder<'a, ExistentialTraitRef<'b>>,
+    pub target_principal: PolyExistentialTraitRef<'a>,
     #[subdiagnostic]
     pub label: Option<SupertraitAsDerefTargetLabel>,
 }
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 6a7b23e40a7..91a7d5d38a1 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -931,6 +931,12 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
     }
 }
 
+impl rustc_errors::IntoDiagnosticArg for PolyExistentialTraitRef<'_> {
+    fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+        self.to_string().into_diagnostic_arg()
+    }
+}
+
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
 #[derive(HashStable)]
 pub enum BoundVariableKind {