| [](https://github.com/compiler-explorer/compiler-explorer/actions?query=workflow%3A%22Compiler+Explorer%22) |
| [](https://codecov.io/gh/compiler-explorer/compiler-explorer) |
| |
|  |
| |
| # Compiler Explorer |
| |
| **Compiler Explorer** is an interactive compiler. The left-hand pane shows |
| editable C, C++, Rust, Go, D, Haskell, Swift, Pascal (and some more!) code. |
| The right, the assembly output of having compiled the code with a given |
| compiler and settings. Multiple compilers are supported, and the UI layout |
| is configurable (thanks to [GoldenLayout](https://www.golden-layout.com/)). |
| There is also an ispc compiler _[?](https://ispc.github.io/)_ for a C variant |
| with extensions for SPMD. |
| |
| Try out at [godbolt.org](https://godbolt.org). |
| |
| You can support [this project on Patreon](https://patreon.com/mattgodbolt). |
| |
| **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 serve my needs at [my previous employer](https://drw.com) 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 [2,000,000 compilations per week](https://www.stathat.com/cards/Tk5csAWI0O7x). |
| |
| ## 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 of the 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. |
| |
| ## Developing |
| |
| **Compiler Explorer** is written in [Node.js](https://nodejs.org/). |
| |
| Assuming you have a compatible version of `node` installed, simply running |
| `make` ought to get you up and running with an Explorer running on port 10240 |
| on your local machine: http://localhost:10240/. |
| Currently **Compiler Explorer** |
| [requires the latest LTS](CONTRIBUTING.md#node-version) `node` version |
| (_v12_) 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`. 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. |
| |
| 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). |
| |
| The config system leaves a lot to be desired. This is something we want to improve. |
| |
| |
| A [Road map](Roadmap.md) is available which gives a little insight into |
| the future plans for **Compiler Explorer**. |
| |
| ### 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. We would also like to thank [JetBrains](https://www.jetbrains.com/) for their support |
| and for donating licenses to their excellent products to develop **Compiler Explorer**. |
| |
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