In this tutorial, you configure Visual Studio Code on macOS to use the Clang/LLVM compiler and debugger.

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After configuring VS Code, you will compile and debug a simple C++ program in VS Code. This tutorial does not teach you about Clang or the C++ language. For those subjects, there are many good resources available on the Web.

If you have any trouble, feel free to file an issue for this tutorial in the VS Code documentation repository.

Prerequisites

To successfully complete this tutorial, you must do the following:

Install Visual Studio Code on macOS.
Install the C++ extension for VS Code. You can install the C/C++ extension by searching for 'c++' in the Extensions view (⇧⌘X (Windows, Linux Ctrl+Shift+X)).

Ensure Clang is installed

Clang may already be installed on your Mac. To verify that it is, open a macOS Terminal window and enter the following command:

If Clang isn't installed, enter the following command to install the command line developer tools:

Create Hello World

From the macOS Terminal, create an empty folder called projects where you can store all your VS Code projects, then create a subfolder called helloworld, navigate into it, and open VS Code in that folder by entering the following commands:

The code . command opens VS Code in the current working folder, which becomes your 'workspace'. As you go through the tutorial, you will create three files in a .vscode folder in the workspace:

tasks.json (compiler build settings)
launch.json (debugger settings)
c_cpp_properties.json (compiler path and IntelliSense settings)

Add hello world source code file

In the File Explorer title bar, select New File and name the file helloworld.cpp.

Paste in the following source code:

Now press ⌘S (Windows, Linux Ctrl+S) to save the file. Notice that your files are listed in the File Explorer view (⇧⌘E (Windows, Linux Ctrl+Shift+E)) in the side bar of VS Code:

You can also enable Auto Save to automatically save your file changes, by checking Auto Save in the main File menu.

The Activity Bar on the edge of Visual Studio Code lets you open different views such as Search, Source Control, and Run. You'll look at the Run view later in this tutorial. You can find out more about the other views in the VS Code User Interface documentation.

Note: When you save or open a C++ file, you may see a notification from the C/C++ extension about the availability of an Insiders version, which lets you test new features and fixes. You can ignore this notification by selecting the X (Clear Notification).

Explore IntelliSense

In the helloworld.cpp file, hover over vector or string to see type information. After the declaration of the msg variable, start typing msg. as you would when calling a member function. You should immediately see a completion list that shows all the member functions, and a window that shows the type information for the msg object:

You can press the Tab key to insert the selected member. Then, when you add the opening parenthesis, you'll see information about arguments that the function requires.

Build helloworld.cpp

Next, you'll create a tasks.json file to tell VS Code how to build (compile) the program. This task will invoke the Clang C++ compiler to create an executable file from the source code.

It's important to have helloworld.cpp open in the editor because the next step uses the active file in the editor as context to create the build task in the next step.

From the main menu, choose Terminal > Configure Default Build Task. A dropdown will appear listing various predefined build tasks for the compilers that VS Code found on your machine. Choose C/C++ clang++ build active file to build the file that is currently displayed (active) in the editor.

This will create a tasks.json file in the .vscode folder and open it in the editor.

Replace the contents of that file with the following:

The JSON above differs from the default template JSON in the following ways:

'args' is updated to compile with C++17 because our helloworld.cpp uses C++17 language features.
Changes the current working directory directive ('cwd') to the folder where helloworld.cpp is.

The command setting specifies the program to run. In this case, 'clang++' is the driver that causes the Clang compiler to expect C++ code and link against the C++ standard library.

The args array specifies the command-line arguments that will be passed to clang++. These arguments must be specified in the order expected by the compiler.

This task tells the C++ compiler to compile the active file (${file}), and create an output file (-o switch) in the current directory (${fileDirname}) with the same name as the active file (${fileBasenameNoExtension}), resulting in helloworld for our example.

The label value is what you will see in the tasks list. Name this whatever you like.

The problemMatcher value selects the output parser to use for finding errors and warnings in the compiler output. For clang++, you'll get the best results if you use the $gcc problem matcher.

The 'isDefault': true value in the group object specifies that this task will be run when you press ⇧⌘B (Windows, Linux Ctrl+Shift+B). This property is for convenience only; if you set it to false, you can still build from the Terminal menu with Terminal > Run Build Task.

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Note: You can learn more about tasks.json variables in the variables reference.

Running the build

Go back to helloworld.cpp. Because we want to build helloworld.cpp it is important that this file be the one that is active in the editor for the next step.
To run the build task that you defined in tasks.json, press ⇧⌘B (Windows, Linux Ctrl+Shift+B) or from the Terminal main menu choose Run Build Task.
When the task starts, you should see the Integrated Terminal window appear below the code editor. After the task completes, the terminal shows output from the compiler that indicates whether the build succeeded or failed. For a successful Clang build, the output looks something like this:
Create a new terminal using the + button and you'll have a new terminal with the helloworld folder as the working directory. Run ls and you should now see the executable helloworld along with the debugging file (helloworld.dSYM).
You can run helloworld in the terminal by typing ./helloworld.

Modifying tasks.json

You can modify your tasks.json to build multiple C++ files by using an argument like '

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