Clone this repo:


  1. cd52896 Revert "xvfb: Wait for ReparentNotify before executing tests." by Martin Šrámek · 2 days ago master
  2. 5b3f6a3 xvfb: Wait for ReparentNotify before executing tests. by Maksim Sisov · 2 days ago
  3. 2699214 [code coverage] Set partial instrumentation iOS coverage try builder. by zhaoyangli · 4 days ago
  4. b0a4157 Remove android_cronet_tester. by Erik Staab · 5 days ago
  5. 4cba157 Remove src-side configs for fyi cros VM & HW test bots. by Ben Pastene · 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: