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Contributing to ELF

We want to make contributing to this project as easy and transparent as possible.


In addition to the project dependencies, you'll need the following if you'd like to contribute code to ELF2:

sudo apt-get install clang-format clang-tidy
conda install flake8 pytest
conda install -c conda-forge autopep8

Pull Requests

We actively welcome your pull requests.

  1. Fork the repo and create your branch from master.
  2. If you've added code that should be tested, add tests.
  3. If you've changed APIs, update the documentation.
  4. Ensure the test suite passes.
  5. Make sure your code lints (see the codetools/ directory).
  6. If you haven't already, complete the Contributor License Agreement ("CLA").

We have a continuous integration system that will double-check steps 4 and 5 for you.

Contributor License Agreement ("CLA")

In order to accept your pull request, we need you to submit a CLA. You only need to do this once to work on any of Facebook's open source projects.

Complete your CLA here.


We use GitHub issues to track public bugs. Please ensure your description is clear and has sufficient instructions to be able to reproduce the issue.

This project is still an extremely unstable prototype so we will be limited in the amount of support we're able to provide.

Coding Style

  • For C++, we use a style very similar to the HHVM style guide. This prescription is not formal, and our .clang-format file and existing code should eventually be a good source of truth. Due to a quirk of Python.h, all pybind includes must be first in the include order.
  • For Python, we use pep8.

We have tools to check your C++ and Python code in the codetools/ directory


By contributing to ELF, you agree that your contributions will be licensed under the LICENSE file in the root directory of this source tree.