1 下载安装glog

1 Git clone https://github.com/google/glog.git
2 cd glog
3 ./autogen.sh
4 ./configure  --prefix=path(install)
5 make
6 make install

2 在CMakeLists.txt中添加glog

find_package(Glog REQUIRED)

include_directories(
  ${GLOG_INCLUDE_DIRS}
)

## 把glog链接到库${PROJECT_LIB_NAME}中
target_link_libraries(${PROJECT_LIB_NAME} glog)

3. 在C++ main函数中初始化配置glog

// 扑捉到程序崩溃或者中断时，把相应的信息打印到log文件和输出到屏幕。
void SignalHandler(const char *data, int size) {
  std::string glog_file = "./log/error.log";
  std::ofstream fs(glog_file, std::ios::app);
  std::string str = std::string(data, size);
  fs << str;
  fs.close();
  LOG(INFO) << str;
}



int main(int argc, char **argv) {
  FLAGS_colorlogtostderr = true;   // log信息区分颜色
  FLAGS_logtostderr = 1;           // 允许log信息打印到屏幕
  google::SetStderrLogging(google::GLOG_INFO);  // 输出log的最低等级是 INFO (可以设置为WARNING或者更高)
  google::InstallFailureSignalHandler();     // 配置安装程序崩溃失败信号处理器
  google::InstallFailureWriter(&SignalHandler);  // 安装配置程序失败信号的信息打印过程，设置回调函数
  google::InitGoogleLogging((const char *)argv[0]);  // 用当前可执行程序初始化glog


  // 下面测试glog
  LOG(INFO) << "this is info.";
  LOG(WARNING) << "this is warning.";
  LOG(ERROR) <<"this is error.";


  google::SetStderrLogging(google::GLOG_WARNING);  // 提高log输出等级为WARNING
  LOG(INFO) << "this is info.";
  LOG(WARNING) << "this is warning.";
  LOG(ERROR) <<"this is error.";
  
  
  // test 
  int i = 0;
  int k = 10/i;

}

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