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# MB - The Meta-Build wrapper
MB is a simple wrapper intended 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 is meant to use GN or GYP.
It supports two main functions:
1. "gen" - the main `gyp_chromium` / `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:
* [The User Guide](docs/user_guide.md)
* [The Design Spec](docs/design_spec.md)