Build script helpers used by the Vortex crates that own FlatBuffers (.fbs) or Protocol Buffers (.proto) schema definitions.

Each schema lives in the crate that owns the types it describes, and is compiled into OUT_DIR by that crate's build.rs. Schemas that include/import schemas from another crate declare that crate explicitly:

fn main() {
    vortex_build::flatbuffers()
        .depends_on("vortex-array")
        .compile(&["vortex-serde/message.fbs"]);
}

depends_on resolves the dependency's schema directory through Cargo's links metadata (DEP_<LINKS>_FLATBUFFERS / DEP_<LINKS>_PROTO), so it works identically for path dependencies in the workspace and for packages unpacked from a registry. The exporting crate only needs a links key in its manifest; vortex-build emits the metadata automatically.

• .proto compilation is pure Rust (via protox) and needs no external tooling.
• .fbs compilation shells out to the FlatBuffers compiler. flatc must be on PATH, or its location given in the FLATC environment variable.