Update CI

.github/workflows/ccpp.yml

@@ -4,12 +4,14 @@ on: [push]
 
 jobs:
   build:
-
+    strategy:
-    runs-on: ubuntu-latest
+      matrix:
+        platform: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.platform }}
     
     steps:
     - uses: actions/checkout@v1
     - name: make
       run: make
-    - name: make check
+    - name: make checkall
-      run: make check
+      run: make checkall