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  1. 64bc84e add a Mac Builder using Python2 less bot by Takuto Ikuta · 5 hours ago main
  2. 133a698 Set up linux-rel-orchestrator-pool experimental try builder by Stephanie Kim · 27 hours ago
  3. d6249c0 Add no_fieldtrial builders for android. by Hao Wu · 2 days ago
  4. e244cca [infra] Remove use-st arg from mb and filter files for removed buidler by Struan Shrimpton · 3 days ago
  5. 34a9fd4 [infra]Create experimental builder for the ml rts experiment by Struan Shrimpton · 3 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: