Hello Rust 範例

以下範例說明如何建構依附於 Rust 程式庫的 Rust 二進位檔。

目前 Rust 模組僅限於 build/soong/rust/config/allowed_list.go 中定義的特定目錄。下列 helloWorld 模組使用 external/rust 目錄，避免修改這個清單。

從 Android 開放原始碼計畫來源根目錄

mkdir -p external/rust/hello_rust/src/
mkdir -p external/rust/libsimple_printer/src/

建立 external/rust/hello_rust/src/hello_rust.rs，並加入以下內容：

use simple_printer;
fn main() {
 simple_printer::print_hello_rust();
}

建立 external/rust/libsimple_printer/src/lib.rs 檔案，並加入以下內容：

pub fn print_hello_rust() {
  println!("Hello Rust!");
}

建立 external/rust/hello_rust/Android.bp 檔案，並加入以下內容：

rust_binary {
    name: "hello_rust",

    // srcs must contain a single source file, the entry point source.
    srcs: ["src/hello_rust.rs"],

    // rustlibs are Rust library dependencies. The type, rlib (static) or dylib
    // (dynamic), are chosen automatically based on module type and target
    // to avoid linkage issues.
    rustlibs: ["libsimple_printer"],

    // define any additional compilation flags
    flags: [
        "-C debug-assertions=yes",
    ],

    // cc libraries can be linked in to rust binaries and libraries through the
    // shared_libs and static_libs properties. These are not needed for this
    // simple example, so they are not included.
}

建立 external/rust/libsimple_printer/Android.bp 檔案，並加入以下內容：

// rust_library provides dylib and rlib variants.
rust_library {
    //name or stem properties must be of the form lib<crate_name><any_suffix>
    name: "libsimple_printer",

    //crate_name must match the name used in source (e.g. extern crate <name>)
    crate_name: "simple_printer",

    //srcs must contain a single source file, the entry point source
    srcs: ["src/lib.rs"],
}

最後，建構 hello_rust 模組：

source build/envsetup.sh
lunch aosp_arm64-eng
m hello_rust