[SOLVED] How to set C++ standard in gcc compiler on Ubuntu VS Code

Issue

I'm running VS Code on freshly installed Ubuntu 22.04 LTS. Whatever I try, my language standard is stuck at c++17. I use gcc compiler. To check the issue I run the following code:

#include <iostream>

int main()
{
    if (__cplusplus == 201703L) std::cout << "C++17\n";
    return 0;
}

Output is always the same: C++17

1. I've set "cppStandard": "c++23", in c_cpp_proporties.json.
2. I've set C++ standard in C/C++ Configurations settings to c++23.
3. I've set compiler arguments to -std=c++23.

I've been resetting VS Code, creating new files, reinstalling extensions, nothing. Snippet from my tasks.json:

{
"tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++ build active file",
            "command": "/usr/bin/g++",
            "args": [
                "-fdiagnostics-color=always",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": "build",
            "detail": "Task generated by Debugger."
        }
    ],
    "version": "2.0.0"
}

Installed extensions:

• C/C++ by Microsoft
• C/C++ Extension Pack by Microsoft
• C/C++ Themes by Microsoft
• CMake Tools by Microsoft
• Better C++ Syntax by Jeff Hykin

Solution

As many of the commentators pointed out, tasks.json is used for compiling. @Some programmer dude correctly explained that I should put argument inside it. Updating task.json with the following code is the solution:

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++ build active file",
            "command": "/usr/bin/g++",
            "args": [
                "-std=c++23",
                "-fdiagnostics-color=always",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Task generated by Debugger."
        }
    ],
    "version": "2.0.0"
}

Answered By - kvrier

Answer Checked By - Terry (WPSolving Volunteer)