tree: 98d77a67222c1f8189eb02dfd4cbdd5a80e93f5e [path history] [tgz]
  1. DIR_METADATA
  2. OWNERS
  3. PRESUBMIT.py
  4. README.md
  5. __init__.py
  6. docs/
  7. lib/
  8. mb
  9. mb.bat
  10. mb.py
  11. mb_config.pyl
  12. mb_config_expectations/
  13. mb_unittest.py
  14. mb_validation_unittest.py
tools/mb/README.md

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: