Use latest Rust version, Xcode 16 beta, LLVM 20-git on Linux

.bazelrc

@@ -35,6 +35,8 @@ build --incompatible_disallow_empty_glob
 # Prevents bazel cache invalidation when switching terminals
 build --incompatible_strict_action_env
 
+# build --@rules_rust//rust/toolchain/channel=nightly
+
 # Dawn tint build flags
 build --@dawn//src/tint:tint_build_glsl_writer=False
 build --@dawn//src/tint:tint_build_glsl_validator=False

.github/workflows/test.yml

@@ -19,9 +19,9 @@ jobs:
   fixup:
     if: github.event_name == 'pull_request'
     uses: ./.github/workflows/fixup.yml
-  labels:    
+  labels:
     if: github.event_name == 'pull_request'
-    uses: ./.github/workflows/labels.yml 
+    uses: ./.github/workflows/labels.yml
   test:
     strategy:
       matrix:
@@ -93,14 +93,14 @@ jobs:
           wget https://apt.llvm.org/llvm.sh
           sed -i '/apt-get install/d' llvm.sh
           chmod +x llvm.sh
-          sudo ./llvm.sh 19
-          sudo apt-get install -y --no-install-recommends clang-19 lld-19 libunwind-19 libc++abi1-19 libc++1-19 libc++-19-dev libclang-rt-19-dev llvm-19
-          echo "build:linux --action_env=CC=/usr/lib/llvm-19/bin/clang --action_env=CXX=/usr/lib/llvm-19/bin/clang++" >> .bazelrc
-          echo "build:linux --host_action_env=CC=/usr/lib/llvm-19/bin/clang --host_action_env=CXX=/usr/lib/llvm-19/bin/clang++" >> .bazelrc
+          sudo ./llvm.sh 20
+          sudo apt-get install -y --no-install-recommends clang-20 lld-20 libunwind-20 libc++abi1-20 libc++1-20 libc++-20-dev libclang-rt-20-dev llvm-20
+          echo "build:linux --action_env=CC=/usr/lib/llvm-20/bin/clang --action_env=CXX=/usr/lib/llvm-20/bin/clang++" >> .bazelrc
+          echo "build:linux --host_action_env=CC=/usr/lib/llvm-20/bin/clang --host_action_env=CXX=/usr/lib/llvm-20/bin/clang++" >> .bazelrc
           echo "build:linux --copt='-Werror'" >> .bazelrc
           echo "build:linux --copt='-Wno-error=#warnings'" >> .bazelrc
           echo "build:linux --copt='-Wno-error=deprecated-declarations'" >> .bazelrc
-          sed -i -e "s%llvm-symbolizer%/usr/lib/llvm-19/bin/llvm-symbolizer%" .bazelrc
+          sed -i -e "s%llvm-symbolizer%/usr/lib/llvm-20/bin/llvm-symbolizer%" .bazelrc
       - name: Setup macOS
         if: matrix.os.name == 'macOS'
         # TODO: We want to symbolize stacks for crashes on CI. Xcode is currently based on LLVM 16,
@@ -112,7 +112,9 @@ jobs:
         # runner.
         # Use latest available Xcode version – runner still defaults to 15.0.1.
         run: |
-          sudo xcode-select -s "/Applications/Xcode_15.3.app"
+          # sudo xcode-select -s "/Applications/Xcode_15.3.app"
+          # Evaluating Xcode 16.0 beta
+          sudo xcode-select -s "/Applications/Xcode_16_beta_6.app"
           # export LLVM_SYMBOLIZER=$(brew --prefix llvm@15)/bin/llvm-symbolizer
           # sed -i -e "s%llvm-symbolizer%${LLVM_SYMBOLIZER}%" .bazelrc
       - name: Setup Windows
@@ -121,7 +123,7 @@ jobs:
         run: |
           [System.IO.File]::WriteAllLines((Join-Path -Path $env:USERPROFILE -ChildPath '.bazelrc'), 'startup --output_user_root=C:/tmp')
           # TODO: Test that the build is still compatible with the latest LLVM release
-          choco upgrade llvm --version=18.1.6
+          # choco upgrade llvm --version=18.1.8
       - name: Configure download mirrors
         shell: bash
         run: |

WORKSPACE

@@ -355,7 +355,10 @@ rust_register_toolchains(
     edition = "2021",
     # Rust registers wasm targets by default which we don't need, workerd is only built for its native platform.
     extra_target_triples = [],
-    versions = ["1.77.0"],  # LLVM 17
+    versions = [
+        "1.81.0",
+        "nightly/2024-07-25",
+    ],  # LLVM 18
 )
 
 load("@rules_rust//crate_universe:repositories.bzl", "crate_universe_dependencies")