Clone this repo:


  1. 65be412 Add src-side configs for bionic CI+try mirrors of tsan bot. by Stephen Martinis · 6 hours ago master
  2. 9cfa22a [reclient] Adjust a few reclient shadow builders. by Michael Savigny · 9 hours ago
  3. 01b9d7a Add experimental CQ builder to test dual coverage by Prakhar · 33 hours ago
  4. 0d0dcca Create webview wpt builder using emulator by Weizhong Xia · 34 hours ago
  5. d5a5d84 Add src-side configs for bionic CI+try mirrors of Lsan bot. by Ben Pastene · 2 days ago

MB - The Meta-Build wrapper

MB is a simple wrapper around the GN build tool.

It was originally written as part of the GYP->GN migration, in order to provide a uniform interface to either GYP or GN, such that users and bots can call one script and not need to worry about whether a given bot was meant to use GN or GYP.

It eventually grew additional functionality and is now still used even though everything is GN-only.

It supports two main functions:

  1. “gen” - the main gn gen invocation that generates the Ninja files needed for the build.

  2. “analyze” - the step that takes a list of modified files and a list of desired targets and reports which targets will need to be rebuilt.

We also use MB as a forcing function to collect all of the different build configurations that we actually support for Chromium builds into one place, in //tools/mb/mb_config.pyl.

For more information, see: