linking mongocxx using cmakelists file in Linux - linux

Question

i am new to cmake and also to mongocxx. I have installed the mongocxx using the instructions given on the site http://mongocxx.org/mongocxx-v3/. My installatio is fine. Now I am trying to connect with mongodb using cmake in my project. When i write the following cmakelists.txt file
cmake_minimum_required(VERSION 3.15)
project(PROJECT_NAME)
set(CMAKE_CXX_STANDARD 14)
add_executable(PROJECT_NAME main.cpp)
find_package(libmongocxx REQUIRED)
find_package(libbsoncxx REQUIRED)
include_directories(${LIBMONGOCXX_INCLUDE_DIR})
include_directories(${LIBBSONCXX_INCLUDE_DIR})
include_directories("/usr/local/include/mongocxx/v_noabi")
include_directories("/usr/local/include/bsoncxx/v_noabi")
include_directories("/usr/local/include/libmongoc-1.0")
include_directories("/usr/local/include/libbson-1.0")
include_directories("/usr/local/lib")
target_link_libraries(PROJECT_NAME ${LIBMONGOCXX_LIBRARIES})
target_link_libraries(PROJECT_NAME ${LIBBSONCXX_LIBRARIES})
it gives me following error :
CMake Error at CMakeLists.txt:8 (find_package):
By not providing "Findlibmongocxx.cmake" in CMAKE_MODULE_PATH this project
has asked CMake to find a package configuration file provided by
"libmongocxx", but CMake did not find one.
Could not find a package configuration file provided by "libmongocxx" with
any of the following names:
libmongocxxConfig.cmake
libmongocxx-config.cmake
Add the installation prefix of "libmongocxx" to CMAKE_PREFIX_PATH or set
"libmongocxx_DIR" to a directory containing one of the above files. If
"libmongocxx" provides a separate development package or SDK, be sure it
has been installed.
-- Configuring incomplete, errors occurred!
See also "/home/fedora/testmongo/build/CMakeFiles/CMakeOutput.log".
I also tried to run my cpp file with this method given on above website.
code of my cpp file is
#include <cstdint>
#include <iostream>
#include <vector>
#include <bsoncxx/json.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/stdx.hpp>
#include <mongocxx/uri.hpp>
#include <mongocxx/instance.hpp>
#include <bsoncxx/builder/stream/helpers.hpp>
#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/builder/stream/array.hpp>
using bsoncxx::builder::stream::close_array;
using bsoncxx::builder::stream::close_document;
using bsoncxx::builder::stream::document;
using bsoncxx::builder::stream::finalize;
using bsoncxx::builder::stream::open_array;
using bsoncxx::builder::stream::open_document;
mongocxx::instance instance{}; // This should be done only once.
int main() {
std::cout << "Hello, World!" << std::endl;
mongocxx::client conn{ mongocxx::uri{ "mongodb://localhost:27017" } };
auto coll = conn["test"]["coll"];
std::vector<bsoncxx::document::value> documents;
for(int i = 0; i < 100; i++) {
documents.push_back(bsoncxx::builder::stream::document{} << "i" << i
<< finalize);
}
coll.insert_many(documents);
return 0;
}
and im trying to compile it with this command. its not giving any error
c++ --std=c++11 .cpp
-I/usr/local/include/mongocxx/v_noabi -I/usr/local/include/libmongoc-1.0
-I/usr/local/include/bsoncxx/v_noabi -I/usr/local/include/libbson-1.0
-L/usr/local/lib -lmongocxx -lbsoncxx
It complies without any errors and also generate output file a.out, but i don't know how to run that output file. its not running with
./a.out
gives following error
./a.out: error while loading shared libraries:
libmongocxx.so._noabi: cannot open shared object file: No such file
or directory """" This is the exact error i got
what should i do to correct this error or run the below executable file?

Answer 1

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/mongo-cxx-driver/lib64
These step resolved my problem

Answer 2

Use this as your CMakeLists.txt. Change $YOUR_PROJECT_NAME with your project's name.
cmake_minimum_required(VERSION 3.5)
if(POLICY CMP0025)
cmake_policy(SET CMP0025 NEW)
endif()
project($YOUR_PROJECT_NAME CXX)
if(NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 11)
endif()
set(CMAKE_CXX_EXTENSIONS OFF)
if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror")
endif()
find_package(mongocxx REQUIRED)
add_executable(${PROJECT_NAME} main.cpp)
# Visual Studio pre 2017 requires boost polyfill.
if (CMAKE_CXX_COMPILER_ID STREQUAL "MSVC" AND CMAKE_CXX_STANDARD LESS 17)
find_package(Boost 1.56.0 REQUIRED)
if (CMAKE_VERSION VERSION_LESS 3.15.0)
target_include_directories(${PROJECT_NAME} PRIVATE ${Boost_INCLUDE_DIRS})
else()
target_link_libraries(${PROJECT_NAME} PRIVATE Boost::boost)
endif()
endif()
target_link_libraries(${PROJECT_NAME}
PRIVATE mongo::mongocxx_shared
)
add_custom_target(run
COMMAND ${PROJECT_NAME}
DEPENDS ${PROJECT_NAME}
WORKING_DIRECTORY ${CMAKE_PROJECT_DIR}
)
get_target_property(LIBMONGOCXX_DEFINITIONS mongo::mongocxx_shared INTERFACE_COMPILE_DEFINITIONS)
list(FIND LIBMONGOCXX_DEFINITIONS "BSONCXX_STATIC" LIST_IDX)
if (${LIST_IDX} GREATER -1)
message(FATAL_ERROR "Expected BSONCXX_STATIC to not be defined")
endif()
list(FIND LIBMONGOCXX_DEFINITIONS "MONGOCXX_STATIC" LIST_IDX)
if (${LIST_IDX} GREATER -1)
message(FATAL_ERROR "Expected MONGOCXX_STATIC to not be defined")
endif()