Feature/add ccache

.github/workflows/build_and_test.yml

@@ -117,34 +117,36 @@ jobs:
       run: cmd /c "curl -fsSL https://raw.githubusercontent.com/tudat-team/tudat-resources-feedstock/master/recipe/post-link.bat | cmd"
 
 
-    - name: Set reusable strings
-      # Turn repeated input strings (such as the build output directory) into step outputs. These step outputs can be used throughout the workflow file.
-      id: strings
-      shell: bash -l {0}
-      run: |
-        echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
+    - name: Setup ccache 
+      # This third party action will setup ccache on the runner and restore any previously saved cache. Caches are saved automatically by the action after a build.
+      uses: hendrikmuhs/[email protected]
+      with:
+        key: ${{ matrix.os }}-${{ matrix.type }}
 
 
     - 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
       shell: bash -l {0}
       run: >
-        cmake -B "${{ steps.strings.outputs.build-output-dir }}"
+        cmake -B "${{ github.workspace }}/build"
+        -S "${{ github.workspace }}"
+        -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
         -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
+        -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
         -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
-        -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
-        -S "${{ github.workspace }}"
+        -DCMAKE_C_COMPILER_LAUNCHER=ccache
+        -DTUDAT_BUILD_GITHUB_ACTIONS=ON
 
 
     - 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). Use multiple cpu cores available in the runner.
       shell: bash -l {0}
-      run: cmake --build "${{ steps.strings.outputs.build-output-dir }}" --config "${{ matrix.build_type }}" -j4
+      run: cmake --build "${{ github.workspace }}/build" --config "${{ matrix.build_type }}" -j4
 
 
     - name: Test
-      working-directory: ${{ steps.strings.outputs.build-output-dir }}
+      working-directory: "${{ github.workspace }}/build"
       # Execute tests defined by the CMake configuration. Note that --build-config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       # Prevent the action from failing if any of the tests fail by using `|| true`. This is placed temporarily because currently, some tests fail on MacOS, and if the action fails, the cache is not updated, which prevents testing of the cache feature on MacOS.

CMakeLists.txt

@@ -86,6 +86,31 @@ else()
     option(TUDAT_BUILD_WITH_EXTENDED_PRECISION_PROPAGATION_TOOLS "Build tudat with extended precision propagation tools." OFF)
 endif()
 
+# Build as part of a GitHub Actions workflow
+# Option enables the use of ccache by MSVC
+# see https://github.com/ccache/ccache/wiki/MS-Visual-Studio
+option(TUDAT_BUILD_GITHUB_ACTIONS "Build as part of GitHub Actions workflow." OFF)
+if (TUDAT_BUILD_GITHUB_ACTIONS AND MSVC)
+    find_program(ccache_exe ccache)
+    if(ccache_exe)
+        message(STATUS "CONFIGURING MSVC FOR CCACHE")
+        file(COPY_FILE ${ccache_exe} ${CMAKE_BINARY_DIR}/cl.exe ONLY_IF_DIFFERENT)
+
+        # By default Visual Studio generators will use /Zi which is not compatible
+        # with ccache, so tell Visual Studio to use /Z7 instead.
+        message(STATUS "Setting MSVC debug information format to 'Embedded'")
+        set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>")
+
+        set(CMAKE_VS_GLOBALS
+        "CLToolExe=cl.exe"
+        "CLToolPath=${CMAKE_BINARY_DIR}"
+        "TrackFileAccess=false"
+        "UseMultiToolTask=true"
+        "DebugInformationFormat=OldStyle"
+        )
+    endif()
+endif()
+
 message(STATUS "******************** BUILD CONFIGURATION ********************")
 message(STATUS "TUDAT_BUILD_TESTS                                     ${TUDAT_BUILD_TESTS}")
 message(STATUS "TUDAT_BUILD_WITH_PROPAGATION_TESTS                    ${TUDAT_BUILD_WITH_PROPAGATION_TESTS}")