Updated macOS and Linux tests to include explicit compiler definition

.github/workflows/macOS.yml

@@ -14,7 +14,13 @@ jobs:
     - uses: actions/checkout@v2
     - name: make setup
       run: make setup
+      
     - name: make compile
       run: make compile
+    - name: make clean
+      run: make clean
+
+    - name: make compile CXX=g++
+      run: make compile CXX=g++
     - name: make clean
       run: make clean

.github/workflows/ubuntu.yml

@@ -18,7 +18,13 @@ jobs:
       run: sudo apt install libasound2-dev mesa-common-dev libx11-dev libxrandr-dev libxi-dev xorg-dev libgl1-mesa-dev libglu1-mesa-dev
     - name: make setup
       run: make setup
+
     - name: make compile
       run: make compile
+    - name: make clean
+      run: make clean
+      
+    - name: make compile CXX=g++
+      run: make compile CXX=g++
     - name: make clean
       run: make clean