| [](https://github.com/compiler-explorer/compiler-explorer/actions?query=workflow%3A%22Compiler+Explorer%22) |
| [](https://codecov.io/gh/compiler-explorer/compiler-explorer) |
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|  |
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| # Compiler Explorer |
| |
| **Compiler Explorer** is an interactive compiler exploration website. Edit code in C, C++, Rust, Go, D, Haskell, Swift, Pascal, [ispc](https://ispc.github.io/), Python, Java |
| or in any of the other [31 supported languages](https://godbolt.org/api/languages), and see how that code looks after being compiled in real time. |
| Multiple compilers are supported for each language, many different tools and visualisations are available, and the UI layout |
| is configurable (thanks to [GoldenLayout](https://www.golden-layout.com/)). |
| |
| Try out at [godbolt.org](https://godbolt.org), or [run your own local instance](#running-a-local-instance). |
| |
| **Compiler Explorer** follows a [Code of Conduct](CODE_OF_CONDUCT.md) which |
| aims to foster an open and welcoming environment. |
| |
| **Compiler Explorer** was started in 2012 to show how C++ constructs translated to assembly code. It started out as a |
| `tmux` session with `vi` running in one pane and `watch gcc -S foo.cc -o -` running in the other. |
| |
| Since then, it has become a public website serving around [2,250,000 compilations per week](https://www.stathat.com/cards/Tk5csAWI0O7x). |
| |
| You can financially support [this project on Patreon](https://patreon.com/mattgodbolt), |
| [GitHub](https://github.com/sponsors/mattgodbolt/), [Paypal](https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=KQWQZ7GPY2GZ6&item_name=Compiler+Explorer+development¤cy_code=USD&source=url), or by |
| buying cool gear on the [Compiler Explorer store](https://shop.spreadshirt.com/compiler-explorer/). |
| |
| ## Using Compiler Explorer |
| |
| ### FAQ |
| |
| There is now a FAQ section [in the repository wiki](https://github.com/compiler-explorer/compiler-explorer/wiki/FAQ). |
| If your question is not present, please contact us as described below, so we can help you. |
| If you find that the FAQ is lacking some important point, please free to contribute to it and/or ask us to clarify it. |
| |
| ### Videos |
| |
| There are a number of videos that showcase some features of Compiler Explorer: |
| |
| * [Presentation for CppCon 2019 about the project](https://www.youtube.com/watch?v=kIoZDUd5DKw) |
| * [Older 2 part series of videos](https://www.youtube.com/watch?v=4_HL3PH4wDg) which go into a bit more detail |
| into the more obscure features. |
| * [Playlist: Compiler Explorer](https://www.youtube.com/playlist?list=PL2HVqYf7If8dNYVN6ayjB06FPyhHCcnhG): A collection of videos discussing Compiler Explorer; using it, installing it, what it's for, etc. |
| |
| A [Road map](docs/Roadmap.md) is available which gives a little insight into |
| the future plans for **Compiler Explorer**. |
| |
| ## Developing |
| |
| **Compiler Explorer** is written in [Node.js](https://nodejs.org/). |
| |
| Assuming you have a compatible version of `node` installed, on Linux simply running |
| `make` ought to get you up and running with an Explorer running on port 10240 |
| on your local machine: [http://localhost:10240/](http://localhost:10240/). If this doesn't work for you, please contact |
| us, as we consider it important you can quickly and easily get running. |
| Currently, **Compiler Explorer** |
| requires [at least `node` 12 _(LTS version)_](CONTRIBUTING.md#node-version) installed, either on the path or at `NODE_DIR` |
| (an environment variable or `make` parameter). |
| |
| Running with `make EXTRA_ARGS='--language LANG'` will allow you to load |
| `LANG` exclusively, where `LANG` is one for the language ids/aliases defined |
| in `lib/languages.js`. For example, to only run **Compiler Explorer** with C++ support, you'd run |
| `make EXTRA_ARGS='--language c++'`. The `Makefile` will automatically install all the |
| third party libraries needed to run; using `npm` to install server-side and |
| client side components. |
| |
| For development, we suggest using `make dev` to enable some useful features, |
| such as automatic reloading on file changes and shorter startup times. |
| |
| You can also use `npm run dev` to run if `make dev` doesn't work on your machine. |
| |
| Some languages need extra tools to demangle them, e.g. `rust`, `d`, or `haskell`. |
| Such tools are kept separately in the |
| [tools repo](https://github.com/compiler-explorer/compiler-explorer-tools). |
| |
| Configuring compiler explorer is achieved via configuration files in the `etc/config` directory. Values are |
| `key=value`. Options in a `{type}.local.properties` file (where `{type}` is `c++` or similar) override anything in the |
| `{type}.defaults.properties` file. There is a `.gitignore` file to ignore `*.local.*` files, so these won't be checked |
| into git, and you won't find yourself fighting with updated versions when you `git pull`. For more information see |
| [Adding a Compiler](docs/AddingACompiler.md). |
| |
| Check [CONTRIBUTING.md](./CONTRIBUTING.md) for detailed information about how you can contribute to **Compiler Explorer**, |
| and the [docs](./docs) folder for specific details regarding various things you might want to do, |
| such as how to add new compilers or languages to the site. |
| |
| ### Running a local instance |
| |
| If you want to point it at your own GCC or similar binaries, either edit the |
| `etc/config/LANG.defaults.properties` or else make a new one with |
| the name `LANG.local.properties`, substituting `LANG` as needed. |
| `*.local.properties` files have the highest priority when loading properties. |
| |
| When running in a corporate setting the URL shortening service can be replaced |
| by an internal one if the default storage driver isn't appropriate for your |
| environment. To do this, add a new module in `lib/shortener/myservice.js` and |
| set the `urlShortenService` variable in configuration. This module should |
| export a single function, see the [tinyurl module](lib/shortener/tinyurl.js) |
| for an example. |
| |
| ### RESTful API |
| |
| There's a simple restful API that can be used to do compiles to asm and to |
| list compilers. |
| |
| You can find the API documentation [here](docs/API.md). |
| |
| ## Contact us |
| |
| We run a [Compiler Explorer Discord](https://discord.gg/B5WacA7), which is a place to discuss using or developing |
| Compiler Explorer. We also have a presence on the [cpplang](https://cppalliance.org/slack/) Slack channel |
| `#compiler_explorer` and we have [a public mailing list](https://groups.google.com/forum/#!forum/compiler-explorer-discussion). |
| |
| There's a development channel on the discord, and also a |
| [development mailing list](https://groups.google.com/forum/#!forum/compiler-explorer-development). |
| |
| Feel free to raise an issue on [github](https://github.com/compiler-explorer/compiler-explorer/issues) or |
| [email Matt directly](mailto:matt@godbolt.org) for more help. |
| |
| ## Credits |
| |
| **Compiler Explorer** is maintained by the awesome people listed in the |
| [AUTHORS](AUTHORS.md) file. |
| |
| We would like to thank the contributors listed in the |
| [CONTRIBUTORS](CONTRIBUTORS.md) file, who have helped shape **Compiler Explorer**. |
| |
| We would also like to specially thank these people for their contributions to |
| **Compiler Explorer**: |
| - [Gabriel Devillers](https://github.com/voxelf) |
| (_while working for [Kalray](http://www.kalrayinc.com/)_) |
| - [Johan Engelen](https://github.com/JohanEngelen) |
| - [Joshua Sheard](https://github.com/jsheard) |
| - [Marc Poulhiès](https://github.com/dkm) |
| - [Andrew Pardoe](https://github.com/AndrewPardoe) |
| |
| A number of [amazing sponsors](https://godbolt.org/#sponsors), both individuals and companies, have helped fund and |
| promote Compiler Explorer. |