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Replace README.md with an archival announcement.

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Blueprint Build System
======================
[![build](https://github.com/danw/blueprint/workflows/build/badge.svg)](https://github.com/google/blueprint/actions)
Blueprint is a meta-build system that reads in Blueprints files that describe
modules that need to be built, and produces a
[Ninja](https://ninja-build.org/) manifest describing the commands that
need to be run and their dependencies. Where most build systems use built-in
rules or a domain-specific language to describe the logic for converting module
descriptions to build rules, Blueprint delegates this to per-project build
logic written in Go. For large, heterogenous projects this allows the inherent
complexity of the build logic to be maintained in a high-level language, while
still allowing simple changes to individual modules by modifying easy to
understand Blueprints files.
Blueprint is being archived on 2021 May 3.
On 2021 May 3, we will be archiving the Blueprint project. This means it will
not be possible to file new issues or open new pull requests for this GitHub
project. As the project is being archived, patches -- including security
patches -- will not be applied after May 3. The source tree will remain
available, but changes to Blueprint in AOSP will not be merged here and
Blueprint's source tree in AOSP will eventually stop being usable outside of
Android.
Whereas there are no meta-build systems one can use as a drop-in replacement for
Blueprint, there are a number of build systems that can be used:
* [Bazel](https://bazel.build), Google's multi-language build tool to build and
test software of any size, quickly and reliably
* [Soong](https://source.android.com/setup/build), for building the Android
operating system itself
* [CMake](https://cmake.org), an open-source, cross-platform family of tools
designed to build, test and package software
* [Buck](https://buck.build), a fast build system that encourages the creation
of small, reusable modules over a variety of platforms and languages
* The venerable [GNU Make](https://www.gnu.org/software/make/)