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  1. 9b04f81 Create and hook up Chrome ARM build for Perf waterfall by Ryan Heise · 3 days ago master
  2. 5a3923a Remove code coverage for experimental CI builders by Stephanie Kim · 3 days ago
  3. eef787e Fix "mb validate" failing for //clank commits by Andrew Grieve · 4 days ago
  4. f130b1c Experimental beefy CI builders by Stephanie Kim · 4 days ago
  5. 257204a Disable thinlto for Cronet builds by Andrew Grieve · 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: