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Mongo-cxx-driver bouwen met CMake ExternalProject_Add

inleidende opmerkingen

Terwijl we naar de details kijken, volgen hier enkele voorlopige opmerkingen:

  • Gebruik een andere map voor SOURCE_DIR en BINARY_DIR
  • In plaats van CMAKE_ARG , liever CMAKE_CACHE_ARGS
  • libbson-1.0_DIR moet NIET worden ingesteld op een bronmap, maar moet worden ingesteld op een bouwmap met een config-file pakket (link hieronder geeft meer details over dit concept)
  • Zorg ervoor dat u altijd het type CMake-argument specificeert (-DCMAKE_CXX_COMPILER:PATH=${CMAKE_CXX_COMPILER} in plaats van -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} )
  • Stel CMAKE_BUILD_TYPE niet in voor generator voor meerdere configuraties

Wat dit laatste punt betreft, betekent dit dat u het volgende moet doen:

set(EXTERNAL_PROJECT_OPTIONAL_CMAKE_CACHE_ARGS)
if(NOT DEFINED CMAKE_CONFIGURATION_TYPES)
  list(APPEND EXTERNAL_PROJECT_OPTIONAL_CMAKE_CACHE_ARGS
    -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
    )
endif()

In dit bericht kunt u leren hoe u uw project kunt structureren:Correcte manier om bibliotheken van derden te gebruiken in cmake-project

werkproject waarmee de mongocxx "test.cpp" kan worden gecompileerd

Hieronder vindt u de inhoud van CMakeLists.txt en test.cpp toestaan ​​om een ​​uitvoerbaar bestand te bouwen met de naam <build-dir>/Test-build/test_mongocxx :

  • CMakeLists.txt:

    cmake_minimum_required(VERSION 3.12)
    
    set(CMAKE_CXX_STANDARD 11) 
    
    project(Test)
    
    option(${PROJECT_NAME}_SUPERBUILD "Build ${PROJECT_NAME} and the projects it depends on." ON)
    
    if(${PROJECT_NAME}_SUPERBUILD)
    
        include(ExternalProject)
    
        set(common_cmake_cache_args
            -DCMAKE_CXX_COMPILER:PATH=${CMAKE_CXX_COMPILER}
        )
        if(NOT DEFINED CMAKE_CONFIGURATION_TYPES)
            list(APPEND common_cmake_cache_args
                -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
            )
        endif()
    
        ExternalProject_Add(libmongoc
            GIT_REPOSITORY  "https://github.com/mongodb/mongo-c-driver.git"
            GIT_TAG         "1.12.0"
            GIT_PROGRESS    1
            GIT_SHALLOW     1
            SOURCE_DIR      "${CMAKE_BINARY_DIR}/libmongoc"
            BINARY_DIR      "${CMAKE_BINARY_DIR}/libmongoc-build"
            INSTALL_DIR     "${CMAKE_BINARY_DIR}/libmongoc-install"
            CMAKE_CACHE_ARGS
                ${common_cmake_cache_args}
                -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}/libmongoc-install
                -DENABLE_TESTS:BOOL=OFF
                -DENABLE_STATIC:BOOL=OFF
                -DENABLE_EXAMPLES:BOOL=OFF
                -DENABLE_EXTRA_ALIGNMENT:BOOL=OFF
            #INSTALL_COMMAND ""
        )
        set(libmongoc-1.0_DIR "${CMAKE_BINARY_DIR}/libmongoc-install/lib/cmake/libmongoc-1.0/")
        set(libbson-1.0_DIR "${CMAKE_BINARY_DIR}/libmongoc-install/lib/cmake/libbson-1.0/")
    
        ExternalProject_Add(libmongocxx
            GIT_REPOSITORY  "https://github.com/mongodb/mongo-cxx-driver.git"
            GIT_TAG         "r3.3.1"
            GIT_PROGRESS    1
            GIT_SHALLOW     1
            SOURCE_DIR      "${CMAKE_BINARY_DIR}/libmongocxx"
            BINARY_DIR      "${CMAKE_BINARY_DIR}/libmongocxx-build"
            INSTALL_DIR     "${CMAKE_BINARY_DIR}/libmongocxx-install"
            CMAKE_CACHE_ARGS
                ${common_cmake_cache_args}
                -DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_BINARY_DIR}/libmongocxx-install
                -DBUILD_SHARED_LIBS:BOOL=ON
                -DENABLE_TESTS:BOOL=OFF
                -DENABLE_EXAMPLES:BOOL=OFF
                -DBSONCXX_POLY_USE_BOOST:BOOL=OFF
                -DBSONCXX_POLY_USE_MNMLSTC:BOOL=ON
                -DBSONCXX_POLY_USE_STD:BOOL=OFF
                -Dlibmongoc-1.0_DIR:PATH=${libmongoc-1.0_DIR}
                -Dlibbson-1.0_DIR:PATH=${libbson-1.0_DIR}
            DEPENDS
                libmongoc
        )
        set(libmongocxx_DIR "${CMAKE_BINARY_DIR}/libmongocxx-install/lib/cmake/libmongocxx-3.3.1/")
        set(libbsoncxx_DIR "${CMAKE_BINARY_DIR}/libmongocxx-install//lib/cmake/libbsoncxx-3.3.1/")
    
    
        function(ExternalProject_AlwaysConfigure proj)
          # This custom external project step forces the configure and later
          # steps to run.
          _ep_get_step_stampfile(${proj} "configure" stampfile)
          ExternalProject_Add_Step(${proj} forceconfigure
            COMMAND ${CMAKE_COMMAND} -E remove ${stampfile}
            COMMENT "Forcing configure step for '${proj}'"
            DEPENDEES build
            ALWAYS 1
            )
        endfunction()
    
        ExternalProject_Add(${PROJECT_NAME}
            SOURCE_DIR "${CMAKE_SOURCE_DIR}"
            BINARY_DIR "${CMAKE_BINARY_DIR}/${PROJECT_NAME}-build"
            DOWNLOAD_COMMAND ""
            UPDATE_COMMAND ""
            CMAKE_CACHE_ARGS
                ${common_cmake_cache_args}
                -D${PROJECT_NAME}_SUPERBUILD:BOOL=OFF
                -Dlibbsoncxx_DIR:PATH=${libbsoncxx_DIR}
                -Dlibmongocxx_DIR:PATH=${libmongocxx_DIR}
            INSTALL_COMMAND ""
            DEPENDS
                libmongocxx
        )
        ExternalProject_AlwaysConfigure(${PROJECT_NAME})
        return()
    endif()
    
    message(STATUS "Configuring inner-build")
    
    find_package(libmongocxx REQUIRED)
    
    add_executable(test_mongocxx test.cpp)
    target_link_libraries(test_mongocxx PUBLIC ${LIBMONGOCXX_LIBRARIES})
    target_include_directories(test_mongocxx PUBLIC ${LIBMONGOCXX_INCLUDE_DIRS})
    target_compile_definitions(test_mongocxx PUBLIC ${LIBMONGOCXX_DEFINITIONS})
    
  • test.cpp (gekopieerd van https://mongodb.github.io/mongo-cxx-driver/mongocxx-v3/installation/#step-6-test-your-installation):

    #include <iostream>
    
    #include <bsoncxx/builder/stream/document.hpp>
    #include <bsoncxx/json.hpp>
    
    #include <mongocxx/client.hpp>
    #include <mongocxx/instance.hpp>
    
    int main(int, char**) {
        mongocxx::instance inst{};
        mongocxx::client conn{mongocxx::uri{}};
    
        bsoncxx::builder::stream::document document{};
    
        auto collection = conn["testdb"]["testcollection"];
        document << "hello" << "world";
    
        collection.insert_one(document.view());
        auto cursor = collection.find({});
    
        for (auto&& doc : cursor) {
            std::cout << bsoncxx::to_json(doc) << std::endl;
        }
    }
    



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