gflags 下载，编译，安装，使用

gflags下载，安装，使用
下载地址：
官方主页：https://github.com/gflags/gflags
当前最新下载地址

wget https://github.com/gflags/gflags/archive/refs/tags/v2.2.2.tar.gz
tar xvf v2.2.2.tar.gz
cd gflags-2.2.2/
mkdir build
cd build
cmake -DBUILD_SHARED_LIBS=ON -DBUILD_STATIC_LIBS=ON -DINSTALL_HEADERS=ON -DINSTALL_SHARED_LIBS=ON -DINSTALL_STATIC_LIBS=ON -DCMAKE_INSTALL_PREFIX=$(pwd)/../../install ..

不指定安装目录，就直接安装到系统里面了。
示例代码

#include "bits/stdc++.h"
using namespace std;
#include <gflags/gflags.h>
DEFINE_bool(big_menu, true, "Include 'advanced' options in the menu listing");
DEFINE_string(languages, "english,french,german",
        "comma-separated list of languages to offer in the 'lang' menu");
int main(int argc, char* argv[])
{
    google::SetVersionString("V1.0.0@const.net.cn");
    google::SetUsageMessage("-help ");
    google::ParseCommandLineFlags(&argc, &argv, true);
    std::cout << FLAGS_big_menu << std::endl;
    std::cout << FLAGS_languages << std::endl;
    return 0;
}

g++ test_gflags.cpp -o test_gflags -I ./install/include -L ./install/lib -lgflags

运行

./test_gflags -version

test_gflags version V1.0.0@const.net.cn

./test_gflags -helpshort

test_gflags: -help

Flags from test_gflags.cpp:

-big_menu (Include 'advanced' options in the menu listing) type: bool
  default: true
-languages (comma-separated list of languages to offer in the 'lang' menu)
  type: string default: "english,french,german"

./test_gflags -big_menu=false
0
english,french,german

./test_gflags -big_menu=true

1
english,french,german

./test_gflags -big_menu=true -languages=zh-cn

1
zh-cn

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