Move dependencies in 'external' directory and pdate git submodules

external/Catch2/.github/workflows/linux-simple-builds.yml

@@ -0,0 +1,123 @@
+name: Linux builds (basic)
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: ${{matrix.cxx}}, C++${{matrix.std}}, ${{matrix.build_type}}
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        cxx:
+          - g++-5
+          - g++-6
+          - g++-7
+          - g++-8
+          - g++-9
+          - g++-10
+          - clang++-6.0
+          - clang++-7
+          - clang++-8
+          - clang++-9
+          - clang++-10
+        build_type: [Debug, Release]
+        std: [14]
+        include:
+          - cxx: g++-5
+            other_pkgs: g++-5
+          - cxx: g++-6
+            other_pkgs: g++-6
+          - cxx: g++-7
+            other_pkgs: g++-7
+          - cxx: g++-8
+            other_pkgs: g++-8
+          - cxx: g++-9
+            other_pkgs: g++-9
+          - cxx: g++-10
+            other_pkgs: g++-10
+          - cxx: clang++-6.0
+            other_pkgs: clang-6.0
+          - cxx: clang++-7
+            other_pkgs: clang-7
+          - cxx: clang++-8
+            other_pkgs: clang-8
+          - cxx: clang++-9
+            other_pkgs: clang-9
+          - cxx: clang++-10
+            other_pkgs: clang-10
+          # Clang 6 + C++17
+          # does not work with the default libstdc++ version thanks
+          # to a disagreement on variant implementation.
+          # - cxx: clang++-6.0
+          #   build_type: Debug
+          #   std: 17
+          #   other_pkgs: clang-6.0
+          # - cxx: clang++-6.0
+          #   build_type: Release
+          #   std: 17
+          #   other_pkgs: clang-6.0
+          # Clang 10 + C++17
+          - cxx: clang++-10
+            build_type: Debug
+            std: 17
+            other_pkgs: clang-10
+          - cxx: clang++-10
+            build_type: Release
+            std: 17
+            other_pkgs: clang-10
+          - cxx: clang++-10
+            build_type: Debug
+            std: 20
+            other_pkgs: clang-10
+          - cxx: clang++-10
+            build_type: Release
+            std: 20
+            other_pkgs: clang-10
+          - cxx: g++-10
+            build_type: Debug
+            std: 20
+            other_pkgs: g++-10
+          - cxx: g++-10
+            build_type: Release
+            std: 20
+            other_pkgs: g++-10
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Add repositories for older GCC
+      run: |
+        sudo apt-add-repository 'deb http://azure.archive.ubuntu.com/ubuntu/ bionic main'
+        sudo apt-add-repository 'deb http://azure.archive.ubuntu.com/ubuntu/ bionic universe'
+      if: ${{ matrix.cxx == 'g++-5' || matrix.cxx == 'g++-6' }}
+
+    - name: Prepare environment
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y ninja-build ${{matrix.other_pkgs}}
+
+    - name: Configure build
+      working-directory: ${{runner.workspace}}
+      env:
+        CXX: ${{matrix.cxx}}
+        CXXFLAGS: ${{matrix.cxxflags}}
+      # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
+      #       This is important
+      run: |
+        cmake -Bbuild -H$GITHUB_WORKSPACE \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_STANDARD_REQUIRED=ON \
+              -DCMAKE_CXX_EXTENSIONS=OFF \
+              -DCATCH_DEVELOPMENT_BUILD=ON \
+              -G Ninja
+
+    - name: Build tests + lib
+      working-directory: ${{runner.workspace}}/build
+      run: ninja
+
+    - name: Run tests
+      env:
+          CTEST_OUTPUT_ON_FAILURE: 1
+      working-directory: ${{runner.workspace}}/build
+      run: ctest -C ${{matrix.build_type}} -j `nproc`