Bootstrapping Buck2

Buck2 can be built with cargo or buck2. The source repository includes DotSlash files for buck2 itself, so that you can quickly self-bootstrap the build. This is particularly useful if you're writing patches and need to test both builds.

For dependencies on Rust crates from crates.io, we use reindeer to automatically generate BUCK files.

Note that the resulting binary will be compiled without optimisations or jemalloc, so we recommend using the Cargo-produced binary in further development.

First, install dotslash with Cargo:

cargo install --locked dotslash

Next, use reindeer to buckify dependencies:

cd buck2/
./bootstrap/reindeer --third-party-dir shim/third-party/rust buckify

Build a copy of buck2 with buck2:

./bootstrap/buck2 build //:buck2