Add matrix build with santizers

.github/workflows/sanitizers.yml

@@ -0,0 +1,56 @@
+name: Build sanitizers
+
+on: [push, pull_request]
+
+jobs:
+  sanitizers:
+    strategy:
+      matrix:
+        include:
+          - sanitizer: address
+          - sanitizer: memory
+          - sanitizer: undefined
+          - sanitizer: cfi
+    runs-on: ubuntu-20.04
+    steps:
+
+    - uses: actions/checkout@v2
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install g++ gperf build-essential bison flex libreadline-dev gawk tcl-dev libffi-dev git graphviz xdot pkg-config python python3 libboost-system-dev libboost-python-dev libboost-filesystem-dev zlib1g-dev
+
+    - name: Setup environment
+      run: |
+        echo "procs=$(nproc)" >> $GITHUB_ENV
+
+    - name: Get iverilog
+      run: |
+        git clone git://github.com/steveicarus/iverilog.git
+
+    - name: Cache iverilog
+      id: cache-iverilog
+      uses: actions/cache@v2
+      with:
+        path: iverilog-bin
+        key: ${{ hashFiles('iverilog/.git/refs/heads/master') }}
+
+    - name: Build iverilog
+      if: steps.cache-iverilog.outputs.cache-hit != 'true'
+      run: |
+        mkdir iverilog-bin
+        cd iverilog
+        autoconf
+        CC=gcc CXX=g++ ./configure --prefix=$PWD/../iverilog-bin
+        make -j${{ env.procs }}
+        make install
+
+    - name: Build yosys
+      run: |
+        make config-clang
+        make -j${{ env.procs }} SANITIZER=${{ matrix.sanitizer }}
+
+    - name: Run tests with sanitizers
+      run: |
+        PATH=$PWD/iverilog-bin/bin:$PATH make -j${{ env.procs }} test