build: Use build.rs instead of dynamic command.

examples/proxy_wasmtime_example/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["Langyo <langyo.china@gmail.com>"]
 edition = "2021"
 publish = false
+build = "build.rs"
 
 [workspace]
 members = [".", "module"]

examples/proxy_wasmtime_example/README.md

@@ -3,5 +3,6 @@
 Run this demo by [wasmtime](https://wasmtime.dev/) with the following command:
 
 ```bash
+cargo build --target wasm32-wasi --package module --release
 cargo run
 ```

examples/proxy_wasmtime_example/build.rs

@@ -0,0 +1,16 @@
+use std::{env, path::Path, process::Command};
+
+fn main() {
+    // Build the wasm component binary
+    let pwd = Path::new(env!("CARGO_MANIFEST_DIR")).to_path_buf();
+    Command::new("cargo")
+        .current_dir(pwd.clone())
+        .arg("build")
+        .arg("--target")
+        .arg("wasm32-wasi")
+        .arg("--package")
+        .arg("module")
+        .arg("--release")
+        .status()
+        .unwrap();
+}

examples/proxy_wasmtime_example/src/main.rs

@@ -14,21 +14,9 @@ use {
 };
 
 fn main() -> Result<()> {
-    // Build the wasm component binary
-    let pwd = Path::new(env!("CARGO_MANIFEST_DIR")).to_path_buf();
-    Command::new("cargo")
-        .current_dir(pwd.clone())
-        .arg("build")
-        .arg("--target")
-        .arg("wasm32-wasi")
-        .arg("--package")
-        .arg("module")
-        .arg("--release")
-        .status()
-        .unwrap();
-
     // Transfer the wasm binary to wasm component binary
     let adapter = include_bytes!("../res/wasi_snapshot_preview1.command.wasm");
+    let pwd = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).to_path_buf();
     let component = pwd.join("target/wasm32-wasi/release/module.wasm");
     let component = std::fs::read(component)?;
     let component = &ComponentEncoder::default()