Oracle Linux 启用 gcc toolset 14

https://www.cnblogs.com/knight-monkey/p/cpp_learn_20220820.html

https://blog.csdn.net/JasonZhao7/article/details/128159650

yum list | grep gcc-toolset

yum install  gcc-toolset-14

scl enable gcc-toolset-14 bash

source /opt/rh/gcc-toolset-14/enable

CMakeLists.txt

手动添加到 .bash_profile 或 .bashrc

如果你想手动确保每次登录都自动启用 gcc-toolset-14，你可以在你的家目录下的 .bash_profile 或 .bashrc 文件中添加以下行：

source scl_source enable gcc-toolset-14

CMakeLists.txt:

cmake_minimum_required(VERSION 3.26)

project(testapp CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

add_executable(testapp main.cpp)

--------------------------------------------------------------------------

main.cpp

#include <format>
#include <iostream>
#include <optional>
#include <utility> //make_pair

using namespace std;
extern "C"
{
#include <assert.h>
}
int main()
{

    std::optional<int> op = make_optional(20);

    std::pair<string, string> person = make_pair("man", "jason");
    string fmtmsg = std::format("sex:{0},name:{1},op ={2}", person.first, person.second, op.value());

    cout << "format string is: " << fmtmsg << endl;
    system("read");
    exit(EXIT_SUCCESS);
}