Set proper linker flags for each version of macOS

Author: simonlegrand

.github/workflows/full-openmpi.yml

@@ -80,7 +80,6 @@ jobs:
     runs-on: macos-${{ matrix.version }}
 
     env:
-      CXX: "g++ -Wl,-ld_classic -Wl,-commons,use_dylibs -Wno-unused-command-line-argument"
       MPIRUN: mpirun
       MPICC: mpicc
       MPICXX: mpicxx
@@ -99,7 +98,17 @@ jobs:
 
       # - name: Setup tmate session
       #   uses: mxschmitt/action-tmate@v3
-        
+      
+      - name: Set linker flags based on macOS version
+        run: |
+          if [ "${{ matrix.version }}" == "13" ]; then
+            echo "CXX=g++ -Wl,-ld_classic -Wno-unused-command-line-argument" >> $GITHUB_ENV
+          elif [ "${{ matrix.version }}" == "14" ]; then
+            echo "CXX=g++ -Wl,-ld_classic -Wl,-commons,use_dylibs -Wno-unused-command-line-argument" >> $GITHUB_ENV
+          elif [ "${{ matrix.version }}" == "15" ]; then
+            echo "CXX=g++ -Wl,-commons,use_dylibs -Wno-unused-command-line-argument" >> $GITHUB_ENV
+          fi
+         
       - name: Configure
         run: |
           autoreconf -i