only store uncompiled wast in tree

Cargo.toml

@@ -30,6 +30,9 @@ branch = "mycelium"
 default-features = false
 features = ["core"]
 
+[build-dependencies]
+wat = "1.0"
+
 [package.metadata.bootimage]
 default-target = "x86_64-mycelium.json"
 

build.rs

@@ -0,0 +1,12 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+fn main() -> Result<(), Box<std::error::Error>> {
+    let out_dir = PathBuf::from(env::var("OUT_DIR")?);
+
+    // Build our helloworld.wast into binary.
+    let binary = wat::parse_file("src/helloworld.wast")?;
+    fs::write(out_dir.join("helloworld.wasm"), &binary)?;
+    Ok(())
+}

src/lib.rs

@@ -10,7 +10,7 @@ use alloc::vec::Vec;
 
 mod wasm;
 
-const HELLOWORLD_WASM: &[u8] = include_bytes!("helloworld.wasm");
+const HELLOWORLD_WASM: &[u8] = include_bytes!(concat!(env!("OUT_DIR"), "/helloworld.wasm"));
 
 pub fn kernel_main<A>(bootinfo: &impl BootInfo<Arch = A>) -> !
 where