Clone this repo:


  1. 20e5aa2 Remove fyi related config for chromeos-betty-chrome in mb by Qijiang Fan · 5 hours ago main
  2. d55750c Adds mb config for betty try job. by Qijiang Fan · 6 hours ago
  3. 553093a Add builder config for betty-arc-t by Qijiang Fan · 4 days ago
  4. ec19154 mb: Fix explicit android_{high,low}_end configs by Peter Wen · 8 days ago
  5. e3bb26a PA: Remove PGO bot carveout by Kalvin Lee · 8 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: