Want to run your C++ code in a browser? Check out this project that converts LLVM bitcode to JavaScript™. From the project homepage:

Emscripten is an LLVM to JavaScript™ compiler. It takes LLVM bitcode (which can be generated from C/C++ using Clang, or any other language that can be converted into LLVM bitcode) and compiles that into JavaScript™, which can be run on the web (or anywhere else JavaScript™ can run).

Using Emscripten, you can

• Compile C and C++ code into JavaScript™ and run that on the web
• Run code in languages like Python as well, by compiling CPython from C to JavaScript™ and interpreting code in that on the web

They even have Qt demos running!

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