Run compilers interactively from your web browser and interact with the assembly
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.idea Upgrade config settings files syntax Dec 2, 2018
c-preload Whitelist /dev/null for writing and creation. Fixes #1076 Sep 23, 2018
d Update yarn.lock + d/.gitignore Jun 15, 2018
docs documentation Nov 8, 2018
etc icc 19.0.1 for C Dec 13, 2018
examples bugfix clean example file Oct 13, 2018
haskell New attempt at running the haskell demangler Oct 26, 2017
lib Merge pull request #1194 from vcabbage/go-labels Dec 13, 2018
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.eslintignore Move to ESLint Feb 13, 2018
.eslintrc Enforce max-statement/line & further unify UI Mar 24, 2018
.gitattributes Attempt two at specifying linguist config Feb 17, 2018
.gitignore ignore f.out Nov 18, 2018
.istanbul.yml Separate compiler search from app.js Apr 12, 2018
.travis.yml fix #1145 Nov 1, 2018 * Added "Analysis" pseudo-language which lets arbitrary text be analy… May 5, 2018
CODEOWNERS Improve small details Apr 12, 2018 Improve docs (Wording & raw and stylized visuals) Mar 19, 2018 Support Visual C++ and Windows well Jul 28, 2018 Add me to contributors Dec 9, 2018
LICENSE New year, new date Jan 1, 2018
Makefile Add a git_hash into the distribution. Fixes #1213 Dec 7, 2018 Fix comment tag Jun 14, 2018 API doc move and update Oct 31, 2018 Updated roadmap Apr 23, 2018 Don't attempt to pack monaco-editor. Jan 15, 2017
app.js Move to newer sentry library (hopefully fixes any sentry log issues) Dec 7, 2018
package.json update morgan lib Dec 13, 2018
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Compiler Explorer

Compiler Explorer

Compiler Explorer is an interactive compiler. The left-hand pane shows editable C, C++, Rust, Go, D, Haskell, Swift and Pascal 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). There is also an ispc compiler ? for a C variant with extensions for SPMD.

Try out at

You can support this project on Patreon.

Compiler Explorer follows a Code of Conduct which aims to foster an open and welcoming environment.

Contact us

For general discussion, please join the mailing list at!forum/compiler-explorer-discussion or the cpplang slack channel #compiler_explorer.

If you are interested in developing, or want to see the discussions between existing developers, feel free to join the mailing list at!forum/compiler-explorer-development or the cpplang slack channel #ce_implementation.

Feel free to raise an issue on github or email Matt directly for more help.


Compiler Explorer is written in Node.js.

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 node version (v8) 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 yarn to install server-side and client side components.

The config system leaves a lot to be desired. Work has been done on porting CCS to Javascript and then something more rational can be used.

A Road map 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/ or else make a new one with the name, subsituting LANG as needed. * 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 to avoid leaking source code outside of the organization. This is done by adding a new module in static/urlshorten-myservice.js and setting the urlShortenService variable in configuration. This module should export a single function, see the google module for an example. urlShortenService can also be set to none to disable url shortening altogether.


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.


Compiler Explorer is maintained by the awesome people listed in the AUTHORS file.

We would like to thank the contributors listed in the CONTRIBUTORS file, who have helped shape Compiler Explorer.

We would also like to specially thank these people for their contributions to Compiler Explorer:

We would like to thank JetBrains for their support and for donating licenses to their excellent products to develop Compiler Explorer.