Trying -j core-count to speed things up

This approach is more multiplatform portable than Linux oriented

getconf _NPROCESSORS_ONLN || sysctl -n hw.ncpu || nproc --all 2>/dev/null

Author: nciric

.github/workflows/cmake-multi-platform.yml

@@ -45,7 +45,7 @@ jobs:
       run: |
         echo "project-root-dir=${{ github.workspace }}/inflection" >> "$GITHUB_OUTPUT"
         echo "build-output-dir=${{ github.workspace }}/inflection/build" >> "$GITHUB_OUTPUT"
-        
+
     - name: Configure CMake
       # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
       # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
@@ -56,10 +56,14 @@ jobs:
         -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
         -S ${{ steps.strings.outputs.project-root-dir }}
 
+    - name: Get number of CPU cores
+      uses: SimenB/github-actions-cpu-cores@v2
+      id: cpu-cores
+
     - name: Build
       # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
-      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }}
+      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }} -j ${{ steps.cpu-cores.outputs.count }}
 
     - name: Test
       working-directory: ${{ steps.strings.outputs.build-output-dir }}
-      run: cmake --build . -t check
+      run: cmake --build . -t check -j ${{ steps.cpu-cores.outputs.count }}