Run tests under various sanitizers

This is in preparation for the next commit which will fix a very long
standing bug…

.github/workflows/ci.yml

@@ -65,3 +65,34 @@ jobs:
           #fail_ci_if_error: true
           verbose: true
           gcov: true
+
+  sanitizers:
+    name: Test with clang sanitizers
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        compiler: ['clang']
+        # These are the various sanitizers from https://github.com/google/sanitizers:
+        cflags:
+          - '-fsanitize=address -O1 -fno-omit-frame-pointer -g'
+          - '-fsanitize=undefined -fsanitize=memory -fsanitize-memory-track-origins -fPIE -pie -fno-omit-frame-pointer -g -O2'
+          - '-fsanitize=undefined'
+
+      fail-fast: false
+    env:
+      CC: ${{ matrix.compiler }}
+      CFLAGs: ${{ matrix.cflags }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build the code
+        run: make
+
+      - name: Install dependencies
+        run: sudo apt-get install -yy shelltestrunner
+
+      - name: Run tests
+        run: make check