Auto merge of #109335 - Mark-Simulacrum:stable-next, r=Mark-Simulacrum1.68.1

[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`

11 files changed, 46 insertions, 14 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2071c46340c..349332f8cf5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -438,7 +438,7 @@ jobs:
             os: windows-latest-xl
           - name: dist-x86_64-msvc
             env:
-              RUST_CONFIGURE_ARGS: "--build=x86_64-pc-windows-msvc --host=x86_64-pc-windows-msvc --target=x86_64-pc-windows-msvc --enable-full-tools --enable-profiler --set rust.lto=thin"
+              RUST_CONFIGURE_ARGS: "--build=x86_64-pc-windows-msvc --host=x86_64-pc-windows-msvc --target=x86_64-pc-windows-msvc --enable-full-tools --enable-profiler"
               SCRIPT: PGO_HOST=x86_64-pc-windows-msvc src/ci/pgo.sh python x.py dist bootstrap --include-default-paths
               DIST_REQUIRE_ALL_TOOLS: 1
             os: windows-latest-xl
diff --git a/RELEASES.md b/RELEASES.md
index f418ab23d10..bc776ce2ac8 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -1,3 +1,15 @@
+Version 1.68.1 (2023-03-23)
+===========================
+
+- [Fix miscompilation in produced Windows MSVC artifacts](https://github.com/rust-lang/rust/pull/109094)
+  This was introduced by enabling ThinLTO for the distributed rustc which led
+  to miscompilations in the resulting binary. Currently this is believed to be
+  limited to the -Zdylib-lto flag used for rustc compilation, rather than a
+  general bug in ThinLTO, so only rustc artifacts should be affected.
+- [Fix --enable-local-rust builds](https://github.com/rust-lang/rust/pull/109111/)
+- [Treat `$prefix-clang` as `clang` in linker detection code](https://github.com/rust-lang/rust/pull/109156)
+- [Fix panic in compiler code](https://github.com/rust-lang/rust/pull/108162)
+
 Version 1.68.0 (2023-03-09)
 ==========================
 
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 {
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index d44b96cfb99..0474ab344fe 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -593,6 +593,7 @@ impl Build {
 
         // Make a symbolic link so we can use a consistent directory in the documentation.
         let build_triple = build.out.join(&build.build.triple);
+        t!(fs::create_dir_all(&build_triple));
         let host = build.out.join("host");
         if let Err(e) = symlink_dir(&build.config, &build_triple, &host) {
             if e.kind() != ErrorKind::AlreadyExists {
diff --git a/src/ci/docker/host-x86_64/dist-various-2/build-solaris-toolchain.sh b/src/ci/docker/host-x86_64/dist-various-2/build-solaris-toolchain.sh
index cf784a66ae4..3939b4b7c41 100755
--- a/src/ci/docker/host-x86_64/dist-various-2/build-solaris-toolchain.sh
+++ b/src/ci/docker/host-x86_64/dist-various-2/build-solaris-toolchain.sh
@@ -32,24 +32,22 @@ cd solaris
 
 dpkg --add-architecture $APT_ARCH
 apt-get update
-apt-get download $(apt-cache depends --recurse --no-replaces \
+apt-get install -y --download-only                           \
   libc:$APT_ARCH                                             \
-  liblgrp-dev:$APT_ARCH                                      \
   liblgrp:$APT_ARCH                                          \
   libm-dev:$APT_ARCH                                         \
   libpthread:$APT_ARCH                                       \
   libresolv:$APT_ARCH                                        \
   librt:$APT_ARCH                                            \
-  libsendfile-dev:$APT_ARCH                                  \
   libsendfile:$APT_ARCH                                      \
   libsocket:$APT_ARCH                                        \
   system-crt:$APT_ARCH                                       \
-  system-header:$APT_ARCH                                    \
-  | grep "^\w")
+  system-header:$APT_ARCH
 
-for deb in *$APT_ARCH.deb; do
+for deb in /var/cache/apt/archives/*$APT_ARCH.deb; do
   dpkg -x $deb .
 done
+apt-get clean
 
 # The -dev packages are not available from the apt repository we're using.
 # However, those packages are just symlinks from *.so to *.so.<version>.
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index df07d4fae71..743b57ed46e 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -675,7 +675,6 @@ jobs:
                 --target=x86_64-pc-windows-msvc
                 --enable-full-tools
                 --enable-profiler
-                --set rust.lto=thin
               SCRIPT: PGO_HOST=x86_64-pc-windows-msvc src/ci/pgo.sh python x.py dist bootstrap --include-default-paths
               DIST_REQUIRE_ALL_TOOLS: 1
             <<: *job-windows-xl
diff --git a/src/version b/src/version
index ee2f4ca9130..0944cc489c2 100644
--- a/src/version
+++ b/src/version
@@ -1 +1 @@
-1.68.0
+1.68.1
diff --git a/tests/ui/lint/issue-108155.rs b/tests/ui/lint/issue-108155.rs
new file mode 100644
index 00000000000..4ae0cbd92ff
--- /dev/null
+++ b/tests/ui/lint/issue-108155.rs
@@ -0,0 +1,15 @@
+// check-pass
+// check that `deref_into_dyn_supertrait` doesn't cause ICE by eagerly converting
+// a cancelled lint
+
+#![allow(deref_into_dyn_supertrait)]
+
+trait Trait {}
+impl std::ops::Deref for dyn Trait + Send + Sync {
+    type Target = dyn Trait;
+    fn deref(&self) -> &Self::Target {
+        self
+    }
+}
+
+fn main() {}