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//build contains:

Core GN templates and configuration
Core Python build scripts

Since this directory is DEPS'ed in by some other repositories (webrtc, pdfium, v8, etc), it should be kept as self-contained as possible by not referring to files outside of it. Some exceptions exist (//testing, select //third_party subdirectories), but new dependencies tend to break these other projects, and so should be avoided.

Changes to //build should be landed in the Chromium repo. They will then be replicated to the stand-alone build repo by the gsubtreed tool. Note: You can find all directories already available through gsubtreed in the list of all chromium repos.

//build/config - Common templates via .gni files.
//build/toolchain - GN toolchain definitions.
Other .py files - Some are used by GN/Ninja. Some by gclient hooks, some are just random utilities.

Files referenced by //.gn:

//build/BUILDCONFIG.gn - Included by all BUILD.gn files.
//build/secondary - An overlay for BUILD.gn files. Enables adding BUILD.gn to directories that live in sub-repositories.
//build_overrides - Refer to //build_overrides/README.md.

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