[try with Homebrew clang]

Author: kinke

.github/actions/1-setup/action.yml

@@ -49,19 +49,14 @@ runs:
           sudo ln -sf $tool-19 /usr/bin/$tool
           $tool --version
         done
-    - name: 'macOS arm64: Install clang 19 from GitHub' # see mimalloc comment in ../3-build-native/action.yml
+    - name: 'macOS arm64: Install clang 19' # see mimalloc comment in ../3-build-native/action.yml
       if: runner.os == 'macOS' && inputs.arch == 'arm64'
       shell: bash
       run: |
         set -eux
         cd ..
-        curl -fL --retry 3 --max-time 300 -o clang.tar.xz \
-          https://github.com/llvm/llvm-project/releases/download/llvmorg-19.1.7/LLVM-19.1.7-macOS-ARM64.tar.xz
-        mkdir clang
-        tar -xf clang.tar.xz --strip 1 -C clang
-        rm clang.tar.xz
         # also upgrade CMake to v4
-        brew install cmake
+        brew install llvm@19 cmake
         cmake --version
     - name: 'Windows: Install clang v19.1.3 from GitHub'
       if: runner.os == 'Windows'

.github/workflows/main.yml

@@ -85,8 +85,8 @@ jobs:
             os: macos-14
             arch: arm64
             extra_cmake_flags: >-
-              -DCMAKE_C_COMPILER=$PWD/../clang/bin/clang
-              -DCMAKE_CXX_COMPILER=$PWD/../clang/bin/clang++
+              -DCMAKE_C_COMPILER=$(brew --prefix llvm@19)/bin/clang
+              -DCMAKE_CXX_COMPILER=$(brew --prefix llvm@19)/bin/clang++
               -DD_COMPILER_FLAGS="-O -flto=full -defaultlib=phobos2-ldc-lto,druntime-ldc-lto -L-exported_symbol '-L__*' -L-w"
               -DEXTRA_CXXFLAGS=-flto=full
             with_pgo: true