How to make VS Code IntelliSense work with `.mm` file extentions?

Question

When I change the file extension from .cpp to .mm IntelliSense and Go to definition stops working. How can I set it up to with .mm files as well?

Answer 1

If all you want to do is association of .mm files with C++, you merely need to add this association in .vscode/settings.json file of your project:

{
    ...
    "files.associations": {
        "*.mm": "cpp",
        ...
    },
}

Be advised that VSCode is actually able to differentiate Objective-C and Objective-C++ languages. And if you alter the default association, VSCode will drop (possible) support for the language. (however to my knowledge there is no a viable language-server extension for Objective-C/Objective-C++)