use clang18 on macos

Author: ozguronsoy

.github/workflows/tests.yaml

@@ -100,15 +100,18 @@ jobs:
         if: runner.os == 'macOS'
         shell: bash
         run: |
-          brew install llvm
-          LLVM_PREFIX=$(brew --prefix llvm)
+          brew install llvm@18
+          
+          LLVM_PREFIX=$(brew --prefix llvm@18)
           CLANG_LIB_DIR="$LLVM_PREFIX/lib"
           QT_LIB_DIR=$(qtpaths --query QT_INSTALL_LIBS)
-          
-          echo "Detected Clang Root: $LLVM_PREFIX"
+
+          echo "Detected LLVM Root: $LLVM_PREFIX"
+          echo "LLVM_INSTALL_DIR=$LLVM_PREFIX" >> $GITHUB_ENV
           echo "CLANG_INSTALL_DIR=$LLVM_PREFIX" >> $GITHUB_ENV
-          echo "DYLD_LIBRARY_PATH=$CLANG_LIB_DIR:$QT_LIB_DIR:$DYLD_LIBRARY_PATH" >> $GITHUB_ENV
+          echo "SDKROOT=$(xcrun --show-sdk-path)" >> $GITHUB_ENV
           echo "$LLVM_PREFIX/bin" >> $GITHUB_PATH
+          echo "DYLD_LIBRARY_PATH=$CLANG_LIB_DIR:$QT_LIB_DIR:$DYLD_LIBRARY_PATH" >> $GITHUB_ENV
 
       - name: Install Bindings
         shell: bash