CI/CD for C++ Projects: GitHub Actions from A to Z

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Introduction: Why Do C++ Projects Need CI/CD?

C++ development has traditionally been associated with manual builds, running tests, and meticulous version control. However, in modern development, especially when working in a team, this approach becomes a bottleneck. CI/CD (Continuous Integration / Continuous Deployment) is a practice that automates the processes of building, testing, and deploying code. For C++ projects, where compilation or linking errors may only appear on certain platforms, CI/CD is critically important.

GitHub Actions is a powerful and flexible tool built into GitHub that allows you to create pipelines directly in your repository. In this article, we will walk through how to set up CI/CD for a C++ project from scratch using GitHub Actions. You will learn how to automate builds with CMake, run unit tests, check code quality, and even publish releases.

By the end of this article, you will be able to independently configure a pipeline that will save hours of manual work and increase the reliability of your project.

Main Part: Step-by-Step Guide to GitHub Actions for C++

1. GitHub Actions Basics: Workflow, Jobs, and Steps

Before writing code, let's understand the terminology. GitHub Actions is based on workflows, which are described in YAML files inside the .github/workflows/ directory. Each workflow consists of one or more jobs that run in parallel or sequentially. Each job consists of steps — individual commands or actions.

For a C++ project, a typical workflow includes:

Build: Compiling the project using CMake and Make/Ninja.
Test: Running unit tests (e.g., using Google Test or Catch2).
Lint: Checking code with static analyzers (Clang-Tidy, Cppcheck).
Deploy: Publishing artifacts or releases.

The first workflow is usually created for a basic build on Ubuntu, but C++ requires testing on different OSes (Linux, macOS, Windows). GitHub Actions supports all three platforms.

2. Creating Your First Workflow: Build and Test

Create a file .github/workflows/ci.yml in the root of your repository. Below is an example for a project using CMake and Google Test.

name: C++ CI/CD Pipeline

on:  push:    branches: [ main, develop ]  pull_request:    branches: [ main ]

jobs:  build:    strategy:      matrix:        os: [ubuntu-latest, windows-latest, macos-latest]        build_type: [Debug, Release]    runs-on: ${{ matrix.os }}        steps:    - name: Checkout repository      uses: actions/checkout@v4          - name: Install dependencies (Linux)      if: runner.os == 'Linux'      run: sudo apt-get update && sudo apt-get install -y cmake g++ ninja-build          - name: Install dependencies (macOS)      if: runner.os == 'macOS'      run: brew install cmake ninja          - name: Install dependencies (Windows)      if: runner.os == 'Windows'      run: choco install cmake ninja -y          - name: Configure CMake      run: cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}          - name: Build      run: cmake --build build --config ${{ matrix.build_type }}          - name: Run tests      working-directory: build      run: ctest --output-on-failure -C ${{ matrix.build_type }}

This workflow: