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rust三方库使用cargo编译,配置为Cargo.toml。集成到OpenHarmony上需要转换成BUILD.gn规则。为了满足这个需求,需要提供一个cargo2gn转换工具。当需要引入rust三方crate时使用cargo2gn转换工具来把三方库的Cargo.toml转换成BUILD.gn规则。cargo2gn可以单个库进行转换,也可以多个库进行批量转换。
进入到需要转化的rust三方库的目录下,比如需要转化bindgen。
cd openharmony/third_party/rust/bindgen
创建配置文件cargo2gn.json,可以参考如下配置。
{
"copy-out": true,
"run": true,
"add-workspace": true,
"cargo-bin": "/mnt/xxx/openharmony/prebuilts/rustc/linux-x86_64/current/bin"
}
执行以下命令进行转换。
python3 /mnt/xxx/openharmony/build/scripts/cargo2gn.py --config cargo2gn.json
转换结果
import("//build/templates/rust/ohos_cargo_crate.gni")
ohos_cargo_crate("lib") {
crate_name = "bindgen"
crate_type = "rlib"
crate_root = "./lib.rs"
sources = ["./lib.rs"]
edition = "2018"
cargo_pkg_version = "0.64.0"
cargo_pkg_authors = "Jyun-Yan You <jyyou.tw@gmail.com>, Emilio Cobos Álvarez <emilio@crisal.io>, Nick Fitzgerald <fitzgen@gmail.com>, The Servo project developers"
cargo_pkg_name = "bindgen"
cargo_pkg_description = "Automatically generates Rust FFI bindings to C and C++ libraries."
deps = [
"//third_party/rust/bitflags:lib",
"//third_party/rust/cexpr:lib",
"//third_party/rust/clang-sys:lib",
"//third_party/rust/lazy_static:lib",
"//third_party/rust/lazycell:lib",
"//third_party/rust/log:lib",
"//third_party/rust/peeking_take_while:lib",
"//third_party/rust/proc-macro2:lib",
"//third_party/rust/quote:lib",
"//third_party/rust/regex:lib",
"//third_party/rust/rustc-hash:lib",
"//third_party/rust/shlex:lib",
"//third_party/rust/syn:lib",
"//third_party/rust/which:lib",
]
features = [
"default",
"log",
"logging",
"static",
"which",
"which-rustfmt",
]
build_root = "build.rs"
build_sources = ["build.rs"]
build_script_outputs = ["host-target.txt"]
}
进入到rust目录下。
cd openharmony/third_party/rust
把所有需要转换的rust三方库添加到rust目录下的Cargo.toml的[workspace]里,如下所示。
[workspace]
members = [
"aho-corasick",
"memchr",
]
执行单个库转换操作步骤的2和3。
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