Reduce symbol level for win-official to 1.

win-official builder is generating ~300GB while compiling with current
config and running out of disk space. By reducing the symbol level it's
now using 100GB disk space.
win-official is a compile only builder with no child test builder. That
reducing the symbol level shouldn't make much difference.

Bug: 1337665
Change-Id: Id3eb447b97ea79ce242adf78d77d90a0ce8495e2
Commit-Queue: Kuan Huang <>
Reviewed-by: Stephanie Kim <>
Cr-Commit-Position: refs/heads/main@{#1019283}
GitOrigin-RevId: 286cd152238c5952245c4870ddad0af360ac2cdb
2 files changed
tree: 81f9c7da320a4932e06ec1d2b8adbb254d3262f2
  1. docs/
  2. lib/
  3. mb_config_expectations/
  6. mb
  7. mb.bat
  9. mb_config.pyl
  12. OWNERS
  16. rts_banned_suites.json

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: