Building C++ Projects with Emscripten on Windows

This guide will walk you through the process of setting up and building a C++ project with Emscripten on a Windows system. We'll use CMake for project configuration and Emscripten to compile our C++ code into WebAssembly format for web deployment.

Prerequisites

Before getting started, make sure you have the following installed on your system:

• Emscripten: You can download and install Emscripten from the official website.
• CMake: You can download and install CMake from the official website.

Step-by-Step Guide

1. Set up Emscripten

Ensure Emscripten is properly installed on your Windows system. You can follow the instructions provided on the Emscripten Installation Guide.

2. Prepare Your Project

Create a new directory for your project and add the necessary files:

• CMakeLists.txt: Main CMake configuration file.
• Your C++ source files (calc.cpp, calc.hpp, test.cpp, etc.).

3. Configure CMakeLists.txt

Inside your project directory, create a CMakeLists.txt file with the following contents:

cmake_minimum_required(VERSION 3.0)
project(my_project)

# Add your source files here
set(SOURCES
    calc.cpp
    calc.hpp
    test.cpp
)

# Set the output directory for the build
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

# Create the executable
add_executable(my_project ${SOURCES})

# Set C++ standard to C++17
target_compile_features(my_project PUBLIC cxx_std_17)

4. Build Your Project with Emscripten

• Open a command prompt or terminal window and navigate to your project directory.
• Activate the latest installed version of Emscripten using the command:

4. Build Your Project with Emscripten

• Open a command prompt or terminal window and navigate to your project directory.

• Activate the latest installed version of Emscripten using the command: emsdk activate latest

• Set up the environment variables for using Emscripten: emsdk_env.bat

• Generate the build files using CMake:

mkdir build
cd build
emcmake cmake ..

• Build your project: emmake make

This will compile your C++ code into WebAssembly format using Emscripten. The resulting sample3.wasm can be found in build/bin.

Additional Notes

• You can customize the project structure and CMake configuration to suit your specific requirements.
• Emscripten provides various options and optimizations for building WebAssembly applications. Refer to the official documentation for more details.

Feel free to reach out if you encounter any issues or have any questions!