Update emsdk version from 4bfdde80 to fc776de7 This is an automatic change generated by tools/maint/rebaseline_tests.py --update-emsdk. emsdk version updated: 4bfdde80 => fc776de7 The following revisions were included in this update: ``` - fc776de7 Roll emscripten from 2e023432d3a1 to 487a3725b6f1 (2 revisions) - 3bd25e67 Roll llvm-project from 598f15297528 to 8a119310dae2 (6 revisions) - 7bd228ce Roll emscripten from c9cdff6c4179 to 2e023432d3a1 (1 revision) - cd3c9f6e Roll v8 from 0747938f5c0d to b51643fca971 (1 revision) - d5ca679f Roll emscripten from cf1becd9a80b to c9cdff6c4179 (1 revision) - b19002b8 Roll llvm-project from 32819927e0c0 to 598f15297528 (4 revisions) - ad22ce30 Roll llvm-project from cd9963782109 to 32819927e0c0 (9 revisions) - 26ece008 Roll emscripten from 91f02346bdc3 to cf1becd9a80b (1 revision) - f66a17b7 Roll llvm-project from ee62806354aa to cd9963782109 (6 revisions) - b0233f1b Roll llvm-project from 81ed4d01aa58 to ee62806354aa (6 revisions) - 0cefe6fc Roll llvm-project from d89537dd93f6 to 81ed4d01aa58 (9 revisions) - d8b6753e Roll v8 from 40466fbf711d to 0747938f5c0d (1 revision) - dd3324a7 Roll llvm-project from be68a8829d6d to d89537dd93f6 (9 revisions) - 3cb92574 Roll llvm-project from 8c2d7cc3a998 to be68a8829d6d (15 revisions) - 9d013471 Roll llvm-project from 6a33b69d8bae to 8c2d7cc3a998 (5 revisions) ``` Full log: https://chromium.googlesource.com/emscripten-releases/+log/4bfdde80..fc776de7
Main project page: https://emscripten.org
GitHub CI status: 
Chromium builder status: emscripten-releases
Emscripten compiles C and C++ to WebAssembly using LLVM and Binaryen. Emscripten output can run on the Web, in Node.js, and in wasm runtimes.
Emscripten provides Web support for popular portable APIs such as OpenGL and SDL2, allowing complex graphical native applications to be ported, such as the Unity game engine and Google Earth. It can probably port your codebase, too!
While Emscripten mostly focuses on compiling C and C++ using Clang, it can be integrated with other LLVM-using compilers (for example, Rust has Emscripten integration, with the wasm32-unknown-emscripten target).
For detailed instructions and tutorials, visit the Emscripten Website.
There are two primary ways to install Emscripten:
Using the Emscripten SDK (emsdk) (Recommended) The easiest way to get started is by using the Emscripten SDK. Follow the instructions on the downloads page to install it.
From a Git Checkout (Manual Installation) If you have cloned the repository from Git, you can install the dependencies manually and then run the bootstrap script:
./bootstrap.py
For more details, see the developer guide.
Run emcc like you would gcc or clang:
$ emcc hello.c -o hello.js $ node hello.js Hello, world!
Emscripten will compile your code into a WebAssembly module along with a JavaScript file that can load and run it. You can then run the resulting JavaScript in your browser or under Node.js (or Deno or Bun).
Emscripten can also generate a sample HTML page that then loads the JavaScript:
$ emcc hello.c -o hello.html
You can then serve the generated hello.html using the emrun tool, or a web server of your choosing.
For information on how to contribute to the project, see CONTRIBUTING.md and the Contributing section on the website.
Emscripten is available under 2 licenses, the MIT license and the University of Illinois/NCSA Open Source License.
Both are permissive open source licenses, with little if any practical difference between them.
The reason for offering both is that (1) the MIT license is well-known and suitable for a compiler toolchain, while (2) LLVM‘s original license, the University of Illinois/NCSA Open Source License, was also offered to allow Emscripten’s code to be integrated upstream into LLVM. The second reason became less important after Emscripten switched to the LLVM wasm backend, at which point there isn't any code we expect to move back and forth between the projects; also, LLVM relicensed to Apache 2.0 + exceptions meanwhile. In practice you can just consider Emscripten as MIT licensed (which allows you to do pretty much anything you want with a compiler, including commercial and non-commercial use).
See LICENSE for the full content of the licenses.