force usage brew llvm and omp on macos

.github/workflows/MacOS.yml

@@ -20,7 +20,7 @@ jobs:
         submodules: recursive
     - name: Install dependencies
       run: |
-        brew install libomp cgal xerces-c
+        brew install llvm libomp cgal xerces-c
         npm install -g appdmg
     - name: Cache Qt
       id: cache-qt
@@ -45,7 +45,7 @@ jobs:
     - name: Configure and Build
       shell: bash
       run: |
-        bash scripts/${{ runner.os }}/1_build.sh --${{ matrix.precision }} --nightly
+        bash scripts/${{ runner.os }}/1_build.sh --${{ matrix.precision }} --nightly --use_brew_llvm
     - name: Deploy
       shell: bash
       run: |

scripts/macOS/1_build.sh

@@ -20,6 +20,7 @@ INSTALL_PATH=$SOURCE_PATH/../install
 CORES="-j4"
 DOUBLE_PRECISION_OPTION=""
 NIGHTLY_OPTION=""
+USE_BREW_LLVM=false
 QT_DIR=""
 
 #check parameters
@@ -50,6 +51,10 @@ case $i in
         QT_DIR=${i#*=}
         shift # past argument=value
         ;;
+    --use_brew_llvm)
+        USE_BREW_LLVM=true
+        shift # past argument=value
+        ;;
     *)
         # unknown option
         ;;
@@ -68,6 +73,16 @@ then
     mkdir -p $INSTALL_PATH
 fi
 
+if [ "$USE_BREW_LLVM" = true ] ; then
+    export PATH="$(brew --prefix llvm)/bin:$PATH";
+    export CC=/usr/local/opt/llvm/bin/clang
+    export CXX=/usr/local/opt/llvm/bin/clang++
+    export COMPILER=${CXX}
+    export CFLAGS="-I /usr/local/include -I/usr/local/opt/llvm/include"
+    export CXXFLAGS="-I /usr/local/include -I/usr/local/opt/llvm/include"
+    export LDFLAGS="-L /usr/local/lib -L/usr/local/opt/llvm/lib"
+fi
+
 cd $BUILD_PATH
 cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$INSTALL_PATH $DOUBLE_PRECISION_OPTION $NIGHTLY_OPTION $SOURCE_PATH
 make $CORES