1# About 2`//build` contains: 3 * Core GN templates and configuration 4 * Core Python build scripts 5 6Since this directory is DEPS'ed in by some other repositories (webrtc, pdfium, 7v8, etc), it should be kept as self-contained as possible by not referring 8to files outside of it. Some exceptions exist (`//testing`, select 9`//third_party` subdirectories), but new dependencies tend to break these other 10projects, and so should be avoided. 11 12Changes to `//build` should be landed in the Chromium repo. They will then be 13replicated to the stand-alone [build repo](https://chromium.googlesource.com/chromium/src/build) 14by the [gsubtreed tool.](https://chromium.googlesource.com/infra/infra/+/main/infra/services/gsubtreed) 15Note: You can find all directories already available through gsubtreed in the 16[list of all chromium repos](https://chromium.googlesource.com/). 17 18## Contents 19 * `//build/config` - Common templates via `.gni` files. 20 * `//build/toolchain` - GN toolchain definitions. 21 * `Other .py files` - Some are used by GN/Ninja. Some by gclient hooks, some 22 are just random utilities. 23 24Files referenced by `//.gn`: 25 * `//build/BUILDCONFIG.gn` - Included by all `BUILD.gn` files. 26 * `//build/secondary` - An overlay for `BUILD.gn` files. Enables adding 27 `BUILD.gn` to directories that live in sub-repositories. 28 * `//build_overrides` - 29 Refer to [//build_overrides/README.md](../build_overrides/README.md). 30 31## Docs 32 33* [Writing GN Templates](docs/writing_gn_templates.md) 34* [Debugging Slow Builds](docs/debugging_slow_builds.md) 35* [Mac Hermetic Toolchains](docs/mac_hermetic_toolchain.md) 36* [Android Build Documentation](android/docs/README.md) 37