将 libpqxx 库添加到 cmake

Question

我正在处理我的 C++ 简单项目，我在 CMakelists.txt 中遇到了一个关键问题，我无法以错误的方式链接 libpqxx 库，我花了两天时间来解决这个问题。我正在使用 C++ 2017， cmake 版本 3.10， OS ubuntu 16.04, 克里昂这是我的 CMakelists.txt

cmake_minimum_required(VERSION 3.10)
project(myserver)

set(CMAKE_CXX_STANDARD 17)

find_package(Boost)
IF (Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIR})
endif()

link_directories(/usr/local/lib)
include_directories(/usr/local/include)

file(GLOB_RECURSE SOURCE_FILES "src/*.cpp")


add_executable(myserver ${SOURCE_FILES})


TARGET_LINK_LIBRARIES(myserver  ${LIBRARIES})

提前致谢

Answer 1

我找到了解决方案。

   cmake_minimum_required(VERSION 3.10)

    project(myserver)

    set(CMAKE_CXX_STANDARD 17)

    find_package(Boost)
    IF (Boost_FOUND)
    include_directories(${Boost_INCLUDE_DIR})
endif()

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lpqxx -lpq")

set(PQXX /usr/local/include/pqxx)

find_library(PQXX_LIB pqxx)
find_library(PQ_LIB pq)

file(GLOB_RECURSE SOURCE_FILES "src/*.cpp")


add_executable(myserver ${SOURCE_FILES})




TARGET_LINK_LIBRARIES(myserver  ${PQXX_LIB} ${PQ_LIB})

谢谢

Answer 2

没有在 cmake 中构建 libpqxx 的带有 cmake 示例的 libpqxx

设置环境

1.安装 CMake

cd ~
wget https://github.com/Kitware/CMake/releases/download/v3.14.5/cmake-3.14.5.tar.gz
tar xf cmake-3.14.5.tar.gz
cd cmake-3.14.5
./bootstrap --parallel=10
make -j4
sudo make -j4 install

2。安装 libpqxx

cd ~
git clone https://github.com/jtv/libpqxx.git
./configure
make -j4
sudo make install

如何建造

mkdir build
cd build
cmake ..
cmake --build .

如何运行

./main

Opened database successfully: postgres

项目

CMakeLists.txt

cmake_minimum_required (VERSION 3.10)
project(example VERSION 1.0.0 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

add_executable(main main.cpp)

target_link_libraries(main -lpqxx -lpq)

main.cpp

#include <iostream>
#include <pqxx/pqxx>

using namespace std;
using namespace pqxx;

int main(int argc, char *argv[])
{
    try
    {
        connection C("dbname = postgres user = postgres password = mysecretpassword \
      hostaddr = 127.0.0.1 port = 5433");
        if (C.is_open())
        {
            cout << "Opened database successfully: " << C.dbname() << endl;
        }
        else
        {
            cout << "Can't open database" << endl;
            return 1;
        }
    }
    catch (const std::exception &e)
    {
        cerr << e.what() << std::endl;
        return 1;
    }
}

libpqxx with cmake 示例，在 cmake 中构建 libpqxx

设置环境

1.安装 CMake

cd ~
wget https://github.com/Kitware/CMake/releases/download/v3.14.5/cmake-3.14.5.tar.gz
tar xf cmake-3.14.5.tar.gz
cd cmake-3.14.5
./bootstrap --parallel=10
make -j4
sudo make -j4 install

如何建造

mkdir build
cd build
cmake ..
cmake --build .

如何运行

./main

Opened database successfully: postgres

项目

CMakeLists.txt

include(FetchContent)

cmake_minimum_required (VERSION 3.10)
project(example VERSION 1.0.0 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

FetchContent_Declare(
  libpqxx
  GIT_REPOSITORY https://github.com/jtv/libpqxx.git
  GIT_TAG a6b1d60e74c1427c8ac2324b85cd4a0dc2068332
)
set(PQXX_LIBRARIES pqxx_static)

FetchContent_MakeAvailable(libpqxx)

add_executable(main main.cpp)

target_link_libraries(main "${PQXX_LIBRARIES}")

main.cpp

#include <iostream>
#include <pqxx/pqxx>

using namespace std;
using namespace pqxx;

int main(int argc, char *argv[])
{
    try
    {
        connection C("dbname = postgres user = postgres password = mysecretpassword \
      hostaddr = 127.0.0.1 port = 5433");
        if (C.is_open())
        {
            cout << "Opened database successfully: " << C.dbname() << endl;
        }
        else
        {
            cout << "Can't open database" << endl;
            return 1;
        }
    }
    catch (const std::exception &e)
    {
        cerr << e.what() << std::endl;
        return 1;
    }
}

源代码：libpqxx with cmake example

将 libpqxx 库添加到 cmake

Add libpqxx library to cmake

libpqxx

没有在 cmake 中构建 libpqxx 的带有 cmake 示例的 libpqxx

设置环境

如何建造

如何运行

项目

CMakeLists.txt

main.cpp

libpqxx with cmake 示例，在 cmake 中构建 libpqxx

设置环境

如何建造

如何运行

项目

CMakeLists.txt

main.cpp