a7f592a026
The WebAssembly spec interpreter is written in OCaml and the new crate uses `ocaml-interop` along with a small OCaml wrapper to interpret Wasm modules in-process. The build process for this crate is currently Linux-specific: it requires several OCaml packages (e.g. `apt install -y ocaml-nox ocamlbuild`) as well as `make`, `cp`, and `ar`.
55 lines
1.9 KiB
Rust
55 lines
1.9 KiB
Rust
/// Build the OCaml code and statically link it into the Rust library; see the
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/// [ocaml-interop
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/// example](https://github.com/tezedge/ocaml-interop/blob/master/testing/rust-caller/build.rs)
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/// for more details. After playing with this a bit, I discovered that the best
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/// approach to avoid missing symbols was to imitate `dune`: I observed `rm -rf
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/// _build && dune build ./ocaml/interpret.exe.o --display=verbose` and used
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/// that as a pattern, now encoded in `ocaml/Makefile` for easier debugging.
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use std::{env, process::Command};
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const LIB_NAME: &'static str = "interpret";
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const OCAML_DIR: &'static str = "ocaml";
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fn main() {
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if cfg!(feature = "build-libinterpret") {
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build();
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}
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}
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fn build() {
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let out_dir = &env::var("OUT_DIR").unwrap();
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// Re-run if changed.
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println!("cargo:rerun-if-changed={}/{}.ml", OCAML_DIR, LIB_NAME);
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println!("cargo:rerun-if-changed={}/Makefile", OCAML_DIR);
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if let Some(other_dir) = env::var_os("FFI_LIB_DIR") {
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// Link with a library provided in the `FFI_LIB_DIR`.
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println!("cargo:rustc-link-search={}", other_dir.to_str().unwrap());
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println!("cargo:rustc-link-lib=static={}", LIB_NAME);
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} else {
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// Build the library to link to.
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build_lib(out_dir, OCAML_DIR);
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println!("cargo:rustc-link-search={}", out_dir);
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println!("cargo:rustc-link-lib=static={}", LIB_NAME);
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}
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// Enabling this feature alerts the compiler to use the `with_library`
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// module.
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println!("cargo:rustc-cfg=feature=\"has-libinterpret\"");
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}
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// Build the OCaml library into Cargo's `out` directory.
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fn build_lib(out_dir: &str, ocaml_dir: &str) {
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let status = Command::new("make")
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.arg(format!("BUILD_DIR={}", out_dir))
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.current_dir(ocaml_dir)
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.status()
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.expect("Failed to execute 'make' command to build OCaml library");
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assert!(
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status.success(),
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"Failed to build the OCaml library using 'make'."
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)
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}
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