Clone this repo:


  1. 60223ac Reland "Don't build seed corpora in most configs and delete duplicated config" by Jonathan Metzman · 3 days ago master
  2. 89489b8 [AFL] Link builds dynamically by Jonathan Metzman · 3 days ago
  3. 9f0698a Remove use_dawn=true from gpu fyi bots by Austin Eng · 3 days ago
  4. 136a4ef Remove src-side configs for non-swarming Android testers on by Ben Pastene · 3 days ago
  5. a058b5f [libFuzzer] Switch Mac build config to component build and rename the config. by Max Moroz · 4 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: