Merge pull request #501 from gummif/gfa/actions3

Use older gcc with older libzmq

.github/workflows/linux.yml

@@ -3,38 +3,49 @@ name: Linux
 on: [push, pull_request]
 
 jobs:
-  gcc10:
-    runs-on: ubuntu-latest
+  tests:
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        os: ["ubuntu-latest"]
         cppstd: ["98", "11", "20"]
-        buildtype: ["cmake"]
+        cc: ["gcc-10"]
+        cxx: ["g++-10"]
         drafts: ["ON"]
         libzmq: ["4.3.4"]
+        libzmqbuild: ["cmake"]
         include:
-          - cppstd: 11
-            buildtype: "pkgconfig"
+          - os: "ubuntu-18.04"
+            cppstd: 11
+            cc: "gcc-7"
+            cxx: "g++-7"
+            drafts: "OFF"
+            libzmq: "4.2.0"
+            libzmqbuild: "pkgconfig"
+          - os: "ubuntu-latest"
+            cppstd: 20
+            cc: "gcc-10"
+            cxx: "g++-10"
             drafts: "OFF"
             libzmq: "4.3.4"
-          - cppstd: 20
-            buildtype: "cmake"
-            drafts: "OFF"
+            libzmqbuild: "cmake"
+          - os: "ubuntu-latest"
+            cppstd: 17
+            cc: "clang-12"
+            cxx: "clang++-12"
+            drafts: "ON"
             libzmq: "4.3.4"
+            libzmqbuild: "cmake"
 
     steps:
-    - uses: actions/checkout@v1
-    - name: install_deps
-      run: |
-        sudo apt update
-        sudo apt install gcc-10 g++-10
-      shell: bash
+    - uses: actions/checkout@v2
     - name: build
       run: ./ci_build.sh
       env:
-        CC: gcc-10
-        CXX: g++-10
+        CC: ${{ matrix.cc }}
+        CXX: ${{ matrix.cxx }}
         CMAKE_CPP_STD: -DCMAKE_CXX_STANDARD=${{ matrix.cppstd }}
-        BUILD_TYPE: ${{ matrix.buildtype }}
         ENABLE_DRAFTS: ${{ matrix.drafts }}
         ZMQ_VERSION: ${{ matrix.libzmq }}
+        BUILD_TYPE: ${{ matrix.libzmqbuild }}
         VERBOSE: 1