CMake 编译 Log4cplus

1.从官方下载源码：
git clone --recurse https://github.com/log4cplus/log4cplus.git
log4cplus 依赖 catch 和 threadpool, 如果其中一个失败, 可以删除源码根目录对应的文件, 单独下载即可
举个例子:
rm -rf threadpool
git clone https://github.com/log4cplus/ThreadPool.git threadpool
rm -rf catch
git clone https://github.com/philsquared/Catch.git catch

2.编译 msvc 版本库

(1).切换到源码根目录, 创建一个临时文件夹, 用于 cmake 缓存
mkdir .build_msvc
cd .build_msvc

(2).编译 release 版本, 执行如下命令, 其中 CMAKE_INSTALL_PREFIX 指定库及文件输出路径, 本例中将输出到与源码同级目录
# cmake -DCMAKE_INSTALL_PREFIX=../../thirdparties/log4cplus/msvc -DCMAKE_DEBUG_POSTFIX=d ..
cmake -DCMAKE_INSTALL_PREFIX=../../thirdparties/log4cplus/msvc ..
cmake --build . --config release -j8
cmake --install .

如果编译成功, 该目录中有三个子目录, 如下所示：
-- thirdparties/log4cplus/msvc
-- bin
-- include
-- lib

(3).编译 debug 版本, 执行如下命令
# cmake -DCMAKE_INSTALL_PREFIX=../../thirdparties/log4cplus/msvc -DCMAKE_DEBUG_POSTFIX=d -DCMAKE_BUILD_TYPE=Debug ..
# cmake -DCMAKE_INSTALL_PREFIX=../../thirdparties/log4cplus/msvc -DCMAKE_DEBUG_POSTFIX=d ..
cmake --build . --config debug -j8
cmake --install . --config debug

3.编译 mingw32 版本库
(1).添加 mingw32/bin 目录到环境变量
PATH=D:/Qt/Qt5.15.2/Tools/mingw810_32/bin/;%PATH%

(2).切换到源码根目录, 创建一个临时文件夹, 用于 cmake 缓存
mkdir .mingw32
cd .mingw32

(3).编译 release 版本, 执行如下命令, 其中 CMAKE_INSTALL_PREFIX 指定库及文件输出路径
cmake.exe -G "MinGW Makefiles" "-DCMAKE_INSTALL_PREFIX:STRING=../../thirdparties/log4cplus/mingw32" "-DCMAKE_MAKE_PROGRAM=mingw32-make.exe" "-DCMAKE_C_COMPILER:STRING=gcc.exe" "-DCMAKE_CXX_COMPILER:STRING=g++.exe" ..
cmake --build . -j8
cmake --install .

(4).编译 debug 版本, 执行如下命令
cmake.exe -G "MinGW Makefiles" "-DCMAKE_BUILD_TYPE:STRING=Debug" "-DCMAKE_INSTALL_PREFIX:STRING=../../thirdparties/log4cplus/mingw32" "-DCMAKE_MAKE_PROGRAM=mingw32-make.exe" "-DCMAKE_C_COMPILER:STRING=gcc.exe" "-DCMAKE_CXX_COMPILER:STRING=g++.exe" ..
cmake --build . --config debug -j8
cmake --install . --config debug

4.Qt 中使用 log4cplus
(1).可以直接通过 Qt creator 添加一个环境变量, 其路径为编译时指定的输出路径, 也可以将编译时的整个文件夹拷贝到项目的第三方库路径下
qt creator add env:
LOG4CPLUS_DIR 值为 ../../thirdparties/log4cplus/msvc
或者在 CMakeLists.txt 中添加 cmake 文件路径:
set(log4cplus_DIR ../thirdparties/msvc/lib/cmake/log4cplus)

(2).添加 log4plus 库
find_package(log4cplus REQUIRED)
target_link_libraries(TestLog4cplus log4cplus::log4cplusU)

cmake_minimum_required(VERSION 3.14)

project(TestLog4cplus LANGUAGES CXX)

set(CMAKE_INCLUDE_CURRENT_DIR ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

if (${MSVC})
    message("MSVC")
    set(log4cplus_DIR ../thirdparties/msvc/lib/cmake/log4cplus)
endif()

if (${MINGW})
    message("MINGW")
    if (not ${CMAKE_CL_64})
    else()
        set(log4cplus_DIR ../thirdparties/mingw32/lib/cmake/log4cplus)
    endif()
endif()

find_package(log4cplus REQUIRED)

add_executable(TestLog4cplus
    main.cpp
)

target_link_libraries(TestLog4cplus log4cplus::log4cplusU)

　　

#include <map>
#include <string>
#include <log4cplus/logger.h>
#include <log4cplus/configurator.h>
#include <log4cplus/loggingmacros.h>
#include <log4cplus/log4cplus.h>


int main(int argc, char *argv[])
{
    (void)(argc);
    (void)(argv);

    using namespace log4cplus;
    const int LOOP_COUNT = 20;

    Initializer initializer;

    Logger logger = Logger::getInstance(LOG4CPLUS_TEXT("test"));
    // logger.setLogLevel(INFO_LOG_LEVEL);
    logger.setLogLevel(ALL_LOG_LEVEL);

    tstring pattern = LOG4CPLUS_TEXT("%D{%Y-%m-%d %H:%M:%S.%q} %t %p %l %m%n");

    SharedAppenderPtr consoleAppender(new ConsoleAppender);
    consoleAppender->setName(LOG4CPLUS_TEXT("console"));
    // consoleAppender->setLayout(std::unique_ptr<Layout>(new SimpleLayout));
    consoleAppender->setLayout(std::unique_ptr<Layout>(new PatternLayout(pattern)));
    logger.addAppender(consoleAppender);

    // 创建最大为200K，最多缓存5个日志文件的对象(总共是6个文件)
    SharedFileAppenderPtr fileAppender(new RollingFileAppender(LOG4CPLUS_TEXT("logs/Test.log"), 200 * 1024, 5, false, true));
    fileAppender->setName(LOG4CPLUS_TEXT("FirstFile"));
    // fileAppender->setLayout( std::unique_ptr<Layout>(new TTCCLayout()));
    fileAppender->setLayout(std::unique_ptr<Layout>(new PatternLayout(pattern)));
    // fileAppender->getloc();
    logger.addAppender(SharedAppenderPtr(fileAppender.get()));

    for (int i = 0; i < LOOP_COUNT; ++i) {
        LOG4CPLUS_DEBUG(logger, "Entering loop #" << i);
    }

    LOG4CPLUS_TRACE(logger, ("Hello trace"));
    LOG4CPLUS_DEBUG(logger, ("Hello debug"));
    LOG4CPLUS_INFO(logger, ("Hello info"));
    LOG4CPLUS_WARN(logger, ("Hello warn"));
    LOG4CPLUS_ERROR(logger, ("Hello error"));
    LOG4CPLUS_FATAL(logger, ("Hello fatal"));
    LOG4CPLUS_ASSERT(logger, ("Hello assert"));

    std::string str("Hello std::string info");
    LOG4CPLUS_INFO(logger, str.data());

    return 0;
}