Clone this repo:
  1. 1ab6fa2 Attempt to unbreak build with MSVC 15.8.4 by Nico Weber · 25 hours ago master
  2. 082fbe3 Pass -lpthread when linking instead of -pthread by Tom Anderson · 2 days ago
  3. d69a9c3 [help] Fixing help issues. by Julie Hockett · 3 weeks ago
  4. 04685d6 Add --dump-json-tree option for format subcommand. by Tatsuhisa Yamaguchi · 5 days ago
  5. 57586fd Suppress warning on VS2017. by Jamie Madill · 8 days ago


GN is a meta-build system that generates build files for Ninja. There is documentation in docs/ and a presentation on it.

Getting started

You can download the latest version of GN binary for Linux, macOS and Windows.

Alternatively, you can build GN from source:

git clone
cd gn
python build/
ninja -C out
# To run tests:

On Windows, it is expected that cl.exe, link.exe, and lib.exe can be found in PATH, so you'll want to run from a Visual Studio command prompt, or similar.

On Linux and Mac, the default compiler is clang++, a recent version is expected to be found in PATH. This can be overridden by setting CC, CXX, and AR.

Reporting bugs

If you find a bug, you can see if it is known or report it in the bug database.

Sending patches

GN uses Gerrit for code review. The short version of how to patch is:

Register at

... edit code ...
ninja -C out && out/gn_unittests

Then, to upload a change for review:

git commit
git cl upload --gerrit

When revising a change, use:

git commit --amend
git cl upload --gerrit

which will add the new changes to the existing code review, rather than creating a new one.

We ask that all contributors sign Google's Contributor License Agreement (either individual or corporate as appropriate, select ‘any other Google project’).


You may ask questions and follow along w/ GN‘s development on Chromium’s gn-dev@ Google Group.