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| Main project page: <http://emscripten.org> |
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| GitHub CI status: [](https://circleci.com/gh/emscripten-core/emscripten/tree/master) |
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| Chromium builder status: [emscripten-releases](https://ci.chromium.org/p/emscripten-releases) |
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| Overview |
| -------- |
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| Emscripten compiles C and C++ to [WebAssembly](https://webassembly.org/) using |
| [LLVM](https://en.wikipedia.org/wiki/LLVM) and |
| [Binaryen](https://github.com/WebAssembly/binaryen/). Emscripten output can run |
| on the Web, in Node.js, and in |
| [wasm runtimes](https://v8.dev/blog/emscripten-standalone-wasm#running-in-wasm-runtimes). |
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| 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](https://docs.unity3d.com/Manual/webgl-gettingstarted.html) |
| and [Google Earth](https://blog.chromium.org/2019/06/webassembly-brings-google-earth-to-more.html). |
| It can probably port your codebase, too! |
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| While Emscripten mostly focuses on compiling C and C++ using |
| [Clang](https://clang.llvm.org/), it can be integrated with other LLVM-using |
| compilers (for example, Rust has Emscripten integration, with the |
| `wasm32-unknown-emscripten` and `asmjs-unknown-emscripten` targets). |
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| License |
| ------- |
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| Emscripten is available under 2 licenses, the MIT license and the |
| University of Illinois/NCSA Open Source License. |
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| Both are permissive open source licenses, with little if any |
| practical difference between them. |
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| 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. |
