项目的github网址：
https://github.com/gabime/spdlog

下载、编译源码:
$ git clone https://github.com/gabime/spdlog.git
$ cd spdlog && mkdir build && cd build
$ cmake ..  && make -j16
$ ls
发现有 libspdlog.a 
红色字的操作可以加快应用程序编译速度，但是不此处不make也不影响使用。

应用：

在任意开发练习目录中创建源文件  helloSpdlog.cc,文件内容如下：

//helloSpdlog.cc
#include "spdlog/spdlog.h"

int main() 
{
    spdlog::info("Welcome to spdlog!");
    spdlog::error("Some error message with arg: {}", 1);
    
    spdlog::warn("Easy padding in numbers like {:08d}", 12);
    spdlog::critical("Support for int: {0:d};  hex: {0:x};  oct: {0:o}; bin: {0:b}", 42);
    spdlog::info("Support for floats {:03.2f}", 1.23456);
    spdlog::info("Positional args are {1} {0}..", "too", "supported");
    spdlog::info("{:<30}", "left aligned");
    
    spdlog::set_level(spdlog::level::debug); // Set global log level to debug
    spdlog::debug("This message should be displayed..");    
    
    // change log pattern
    spdlog::set_pattern("[%H:%M:%S %z] [%n] [%^---%L---%$] [thread %t] %v");
    
    // Compile time log levels
    // define SPDLOG_ACTIVE_LEVEL to desired level
    SPDLOG_TRACE("Some trace message with param {}", 42);
    SPDLOG_DEBUG("Some debug message");
}

在开发目录中编译：

$ g++ helloSpdlog.cc -o helloSpdlog  -std=c++11 -I /home/xiaoming/github/spdlog/include  -lspdlog

或者加上 -L选项：
$ g++ helloSpdlog.cc -o helloSpdlog  -std=c++11 -I /home/xiaoming/github/spdlog/include -L /home/xiaoming/github/spd -lspdlog

运行程序：
$ ./helloSpdlog
输出如下内容：

[2022-02-14 13:49:37.300] [info] Welcome to spdlog!
[2022-02-14 13:49:37.300] [error] Some error message with arg: 1
[2022-02-14 13:49:37.300] [warning] Easy padding in numbers like 00000012
[2022-02-14 13:49:37.300] [critical] Support for int: 42;  hex: 2a;  oct: 52; bin: 101010
[2022-02-14 13:49:37.300] [info] Support for floats 1.23
[2022-02-14 13:49:37.300] [info] Positional args are supported too..
[2022-02-14 13:49:37.300] [info] left aligned
[2022-02-14 13:49:37.300] [debug] This message should be displayed..

关于 spdlog 输出格式控制：

1. QuickStart · gabime/spdlog Wiki · GitHub

GitHub - fmtlib/fmt: A modern formatting library

Format String Syntax — fmt 8.1.1 documentation