VS Code can't find header files In Linux VSCode

Question

My workspace is :

├── README.md
└── sim
   ├── Makefile
   ├── include
   │   ├── add.cpp
   │   └── add.h
   │   
   └── src
       └── main.cpp
       

My main.cpp is :

// main.cpp
#include <iostream>
#include "Add.h"

using namespace std;

int main()
{

    int a = 10;
    int b = 20;
    int c;
    c = add(a, b);
    cout << a << " + " << b << " = " << c << endl;
    return 0;
}

My add.h is:

// Add.h
#include <iostream>
#include "main.cpp"
using namespace std;

int add(int a, int b);

My add.cpp is:

//add.cpp
#include <iostream>
#include "Add.h"

using namespace std;

int add(int a, int b)
{
    return a + b;
}

My c_cpp_properties.json is:

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**",
                "${workspaceFolder}/sim/include/**"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c17",
            "cppStandard": "gnu++17",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}

My launch.json is:

{
    "version": "0.2.0",
    "configurations": [
        {
            "miDebuggerArgs": "-q -ex quit; wait() { fg >/dev/null; }; /bin/gdb -q --interpreter=mi",
            "name": "C/C++",
            "type": "cppdbg",
            "request": "launch",
            "program": "${fileDirname}/${fileBasenameNoExtension}",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "preLaunchTask": "compile",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ]
        }
    ]
}

My tasks.json is:

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "compile",
            "command": "g++",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}",
                "-I${workspaceFolder}/sim/include/**"
            ],
            "problemMatcher": {
                "owner": "cpp",
                "fileLocation": [
                    "relative",
                    "${workspaceRoot}"
                ],
                "pattern": {
                    "regexp": "^(.*):(\\d+):(\\d+):\\s+(warning|error):\\s+(.*)$",
                    "file": 1,
                    "line": 2,
                    "column": 3,
                    "severity": 4,
                    "message": 5
                }
            },
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

And I encountered an error when I pressed F5 in main.cpp :

enter image description here

 *  Executing task: g++ -g /home/chris/Code/graduation-project/sim/src/main.cpp -o /home/chris/Code/graduation-project/sim/src/main -I/home/chris/Code/graduation-project/sim/include/** 

/home/chris/Code/graduation-project/sim/src/main.cpp:3:10: fatal error: Add.h: No such file or directory
    3 | #include "Add.h"
      |          ^~~~~~~
compilation terminated.

 *  The terminal process "g++ '-g', '/home/chris/Code/graduation-project/sim/src/main.cpp', '-o', '/home/chris/Code/graduation-project/sim/src/main', '-I/home/chris/Code/graduation-project/sim/include/**'" failed to launch (exit code: 1). 
 *  Terminal will be reused by tasks, press any key to close it. 

What should I do ?

How can I get my main.cpp and its header files to work together when they are in different folders? I am using Ubuntu 22.04 under WSL2 and connecting remotely via VSCode.

Answer 1

I had a similar problem as is described by the first question. Based on the discussion here I was able to get mine working.

What I find disconcerting (and confusing) is that the Intellisense Include path is maintained separately from the compiler's Include path. The Include path in the c_cpp_properties.json seems to only affect Intellisense, whereas the compiler option -I is maintained in the tasks.json; the GUI interface doesn't automatically keep the two coordinated. (Unless mine is broken.) Also, there seems to be a difference in convention, where the /** works to recursively specify the include directory for the Intellisense, /* shuts off the recursion for the compiler option. Or, at least that is what it appears for me.