protoc-prebuilt

Protobuf compiler protoc pre-built binaries installer.

Installed binaries stored in OUT_DIR of the crate using the library.

Usage

Library export init function which takes version parameter. Version parameter should be a tag name from protobuf repository without v prefix, for example, "21.12" or "22.0-rc3" (see protobuf repository tags). Function return a tuple contains paths to protoc binary and include directory.

In next examples provided build.rs script content for different generators. For example, we have next simplified project structure with protobuf files:

src/
    proto/
          apple.proto
          orange.proto
build.rs

With prost-build

use prost_build::compile_protos;
use protoc_prebuilt::init;
use std::env::set_var;

fn main() {
  let (protoc_bin, _) = init("22.0").unwrap();
  set_var("PROTOC", protoc_bin);

  compile_protos(
    &["src/proto/apple.proto", "src/proto/orange.proto"],
    &["src/proto"]
  ).unwrap();
}

With protobuf-codegen

use protobuf_codegen::Codegen;
use protoc_prebuilt::init;
use std::env::set_var;

fn main() {
  let (protoc_bin, _) = init("22.0").unwrap();

  Codegen::new()
    .protoc()
    .protoc_path(&protoc_bin)
    .includes(&["src/proto"])
    .inputs(&["src/proto/apple.proto", "src/proto/orange.proto"])
    .cargo_out_dir("proto")
    .run_from_script();
}

Comparison with analogues

• protoc-bin-vendored store pre-built protobuf compiler in dependencies crates, so you can't use latest or specify version of compiler, if it's not provide by crate author
• protobuf-src build protobuf compiler from sources, it not support windows target and compilers versions hardcoded, so you can't use specify version