Auto merge of #120055 - nikic:llvm-18, r=cuviper

Update to LLVM 18

LLVM 18 final is planned to be released on Mar 5th. Rust 1.78 is planned to be released on May 2nd.

Tested images: dist-x86_64-linux, dist-s390x-linux, dist-aarch64-linux, dist-riscv64-linux, dist-loongarch64-linux, dist-x86_64-freebsd, dist-x86_64-illumos, dist-x86_64-musl, x86_64-linux-integration, test-various, armhf-gnu, i686-msvc, x86_64-msvc, i686-mingw, x86_64-mingw, x86_64-apple-1, x86_64-apple-2, dist-aarch64-apple

r? `@ghost`

9 files changed, 16 insertions, 11 deletions

diff --git a/.gitmodules b/.gitmodules
index 9bb68b37081..802d61eea29 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -33,7 +33,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/17.0-2023-12-14
+	branch = rustc/18.0-2024-02-13
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book
diff --git a/Cargo.lock b/Cargo.lock
index d552bb655b4..d4b7253feb5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -747,9 +747,9 @@ checksum = "55b672471b4e9f9e95499ea597ff64941a309b2cdbffcc46f2cc5e2d971fd335"
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.105"
+version = "0.1.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3686cc48897ce1950aa70fd595bd2dc9f767a3c4cca4cd17b2cb52a2d37e6eb4"
+checksum = "d68bc55329711cd719c2687bb147bc06211b0521f97ef398280108ccb23227e9"
 dependencies = [
  "cc",
  "rustc-std-workspace-core",
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index a358a40f92b..5b1cc52f1f6 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -371,10 +371,10 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM,
 }
 
 extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
-#ifdef LLVM_RUSTLLVM
+#if LLVM_VERSION_GE(18, 0)
   const TargetMachine *Target = unwrap(TM);
   const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
-  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
+  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getAllProcessorFeatures();
   return FeatTable.size();
 #else
   return 0;
@@ -383,10 +383,10 @@ extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
 
 extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
                                          const char** Feature, const char** Desc) {
-#ifdef LLVM_RUSTLLVM
+#if LLVM_VERSION_GE(18, 0)
   const TargetMachine *Target = unwrap(TM);
   const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
-  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
+  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getAllProcessorFeatures();
   const SubtargetFeatureKV Feat = FeatTable[Index];
   *Feature = Feat.Key;
   *Desc = Feat.Desc;
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index afbbbb5bd26..836ac3de94d 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -412,9 +412,7 @@ impl Step for Llvm {
         }
 
         if target.is_msvc() {
-            cfg.define("LLVM_USE_CRT_DEBUG", "MT");
-            cfg.define("LLVM_USE_CRT_RELEASE", "MT");
-            cfg.define("LLVM_USE_CRT_RELWITHDEBINFO", "MT");
+            cfg.define("CMAKE_MSVC_RUNTIME_LIBRARY", "MultiThreaded");
             cfg.static_crt(true);
         }
 
diff --git a/src/ci/docker/host-x86_64/dist-various-1/Dockerfile b/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
index ea185cd582c..09fbbac466c 100644
--- a/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-various-1/Dockerfile
@@ -134,6 +134,8 @@ ENV CFLAGS_armv5te_unknown_linux_musleabi="-march=armv5te -marm -mfloat-abi=soft
     CFLAGS_riscv32imc_unknown_none_elf=-march=rv32imc -mabi=ilp32 \
     CC_riscv32imac_unknown_none_elf=riscv32-unknown-elf-gcc \
     CFLAGS_riscv32imac_unknown_none_elf=-march=rv32imac -mabi=ilp32 \
+    CC_riscv32imafc_unknown_none_elf=riscv32-unknown-elf-gcc \
+    CFLAGS_riscv32imafc_unknown_none_elf=-march=rv32imafc -mabi=ilp32 \
     CC_riscv64imac_unknown_none_elf=riscv64-unknown-elf-gcc \
     CFLAGS_riscv64imac_unknown_none_elf=-march=rv64imac -mabi=lp64 \
     CC_riscv64gc_unknown_none_elf=riscv64-unknown-elf-gcc \
diff --git a/src/ci/docker/host-x86_64/test-various/Dockerfile b/src/ci/docker/host-x86_64/test-various/Dockerfile
index 4fe66014c17..3fcf12dd9f2 100644
--- a/src/ci/docker/host-x86_64/test-various/Dockerfile
+++ b/src/ci/docker/host-x86_64/test-various/Dockerfile
@@ -59,6 +59,7 @@ ENV WASM_SCRIPT python3 /checkout/x.py --stage 2 test --host='' --target $WASM_T
   tests/codegen \
   tests/assembly \
   library/core
+ENV CC_wasm32_unknown_unknown=clang-11
 
 ENV NVPTX_TARGETS=nvptx64-nvidia-cuda
 ENV NVPTX_SCRIPT python3 /checkout/x.py --stage 2 test --host='' --target $NVPTX_TARGETS \
diff --git a/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile b/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile
index bec1c897337..c8c754914aa 100644
--- a/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile
+++ b/src/ci/docker/host-x86_64/x86_64-gnu-integration/Dockerfile
@@ -3,6 +3,7 @@ FROM ubuntu:22.04
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y --no-install-recommends \
   build-essential \
+  clang-15 \
   g++ \
   make \
   ninja-build \
@@ -46,6 +47,9 @@ ENV TARGETS=x86_64-fuchsia
 ENV TARGETS=$TARGETS,x86_64-unknown-linux-gnu
 ENV TARGETS=$TARGETS,wasm32-unknown-unknown
 
+# Fuchsia clang does not have wasm target enabled, use system clang.
+ENV CC_wasm32_unknown_unknown=clang-15
+
 COPY scripts/sccache.sh /scripts/
 RUN sh /scripts/sccache.sh
 
diff --git a/src/llvm-project b/src/llvm-project
-Subproject 700fbf978e6c5bb297d12963206f7487722de48
+Subproject 9ea7f739f257b049a65deeb1f2455bb2ea021cf
diff --git a/tests/codegen/iter-repeat-n-trivial-drop.rs b/tests/codegen/iter-repeat-n-trivial-drop.rs
index 0b08e578151..b052d339917 100644
--- a/tests/codegen/iter-repeat-n-trivial-drop.rs
+++ b/tests/codegen/iter-repeat-n-trivial-drop.rs
@@ -47,7 +47,7 @@ pub fn iter_repeat_n_next(it: &mut std::iter::RepeatN<NotCopy>) -> Option<NotCop
 #[no_mangle]
 // CHECK-LABEL: @vec_extend_via_iter_repeat_n
 pub fn vec_extend_via_iter_repeat_n() -> Vec<u8> {
-    // CHECK: %[[ADDR:.+]] = tail call noundef dereferenceable_or_null(1234) ptr @__rust_alloc(i64 noundef 1234, i64 noundef 1)
+    // CHECK: %[[ADDR:.+]] = tail call {{(noalias )?}}noundef dereferenceable_or_null(1234) ptr @__rust_alloc(i64 noundef 1234, i64 noundef 1)
     // CHECK: tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 1 dereferenceable(1234) %[[ADDR]], i8 42, i64 1234,
 
     let n = 1234_usize;