[c++] Visual Studio Code includePath

I'm trying to build C/C++ in Visual Studio Code. I installed C/C++ and all the relevant extensions.

#include <stdio.h>
int main() {
    printf("Test C now\n");
    return 0;
}

But there's a green line under #include <stdio.h> saying "Add include path to settings". When I click it, it moves over to "c_cpp_properties.json".

How and where can I add include paths in the configurations below?

"configurations": [
    {
        "name": "Mac",
        "includePath": ["/usr/include"]
    }
]

In your user settings add:

"C_Cpp.default.includePath":["path1","path2"]

My c_cpp_properties.json config-

{
    "configurations": [
        {
            "name": "Win32",
            "compilerPath": "C:/MinGW/bin/g++.exe",
            "includePath": [
                "C:/MinGW/lib/gcc/mingw32/9.2.0/include/c++"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "windows-gcc-x64"
       }
    ],
    "version": 4
}

I tried this and now working Configuration for c_cpp_properties.json

{
"configurations": [
    {
        "name": "Win32",
        "compilerPath": "C:/MinGW/bin/g++.exe",
        "includePath": [
            "C:/MinGW/lib/gcc/mingw32/9.2.0/include/c++"
        ],
        "defines": [
            "_DEBUG",
            "UNICODE",
            "_UNICODE"
        ],
        "cStandard": "c17",
        "cppStandard": "c++17",
        "intelliSenseMode": "windows-gcc-x64"
    }
],
"version": 4
  }

task.json configuration File

{
"version": "2.0.0",
"tasks": [
    {
        "type": "cppbuild",
        "label": "C/C++: g++.exe build active file",
        "command": "C:\\MinGW\\bin\\g++.exe",
        "args": [
            "-g",
            "${file}",
            "-o",
            "${fileDirname}\\${fileBasenameNoExtension}.exe"
        ],
        "options": {
            "cwd": "C:\\MinGW\\bin"
        },
        "problemMatcher": [
            "$gcc"
        ],
        "group": {
            "kind": "build",
            "isDefault": true
        },
        "detail": "compiler: C:\\MinGW\\bin\\g++.exe"
    }
]}

The best way to configure the standard headers for your project is by setting the compilerPath property to the configurations in your c_cpp_properties.json file. It is not recommended to add system include paths to the includePath property.

Another option if you prefer not to use c_cpp_properties.json is to set the C_Cpp.default.compilerPath setting.

For everybody that falls off google, in here, this is the fix for VSCode 1.40 (2019):

Open the global settings.json: File > Preferences > Settings

Then select the tab 'User', open the section 'Extensions', click on 'C/C++'. Then scroll the right panel till you find a 'Edit in settings.json' button.

Last, you add the "C_Cpp.default.includePath" section. The code provided there is from my own system (Windows 7). You can use it as a base for your own libraries paths. (Remember to change the YOUR USERNAME to your correct system (my case windows) username)
(edit info: There is a problem with the recursion of my approach. VSCode doesn't like multiple definitions for the same thing. I solved it with "C_Cpp.intelliSenseEngine": "Tag Parser" )

the code before line 7, on the settings.json has nothing to do with arduino or includePath. You may not copy that...

JSON section to add to settings.json:

"C_Cpp.default.includePath": [
        "C:/Program Files (x86)/Arduino/libraries/**",
        "C:/Program Files (x86)/Arduino/hardware/arduino/avr/cores/arduino/**",
        "C:/Program Files (x86)/Arduino/hardware/tools/avr/avr/include/**",
        "C:/Program Files (x86)/Arduino/hardware/tools/avr/lib/gcc/avr/5.4.0/include/**",
        "C:/Program Files (x86)/Arduino/hardware/arduino/avr/variants/standard/**",
        "C:/Users/<YOUR USERNAME>/.platformio/packages/framework-arduinoavr/**",
        "C:/Users/<YOUR USERNAME>/Documents/Arduino/libraries/**",
        "{$workspaceFolder}/libraries/**",
        "{$workspaceFolder}/**"
    ],
"C_Cpp.intelliSenseEngine": "Tag Parser"

For Mac users who only have Command Line Tools instead of Xcode, check the /Library/Developer/CommandLineTools directory, for example::

"configurations": [{
    "name": "Mac",
    "includePath": [
            "/usr/local/include",
            // others, e.g.: "/usr/local/opt/ncurses/include",
            "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include",
            "${workspaceFolder}/**"
    ]
}]

You probably need to adjust the path if you have different version of Command Line Tools installed.

Note: You can also open/generate the c_cpp_properties.json file via the C/Cpp: Edit Configurations command from the Command Palette (??P).

I solved this issue by uninstalling Visual Studio that I had installed recently.

This answer maybe late but I just happened to fix the issue. Here is my c_cpp_properties.json file:

{
"configurations": [
    {
        "name": "Linux",
        "includePath": [
            "${workspaceFolder}/**",                
            "/usr/include/c++/5.4.0/",
            "usr/local/include/",
            "usr/include/"
        ],
        "defines": [],
        "compilerPath": "/usr/bin/gcc",
        "cStandard": "c11",
        "cppStandard": "c++14",
        "intelliSenseMode": "clang-x64"
    }
],
"version": 4

}