From 3ebef32c43ca3def79c16a04b10adb5360ccbf4e Mon Sep 17 00:00:00 2001
From: Eliza Weisman <eliza@buoyant.io>
Date: Thu, 10 Nov 2022 11:09:52 -0800
Subject: [PATCH] fix(kernel): ensure build script is rerun on changes (#372)

This ensures that the build script is re-run if the hello world wasm or
the target spec change.
---
 build.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/build.rs b/build.rs
index 0472e80a..3619dded 100644
--- a/build.rs
+++ b/build.rs
@@ -7,6 +7,9 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     // Build our helloworld.wast into binary.
     let binary = wat::parse_file("src/helloworld.wast")?;
-    fs::write(out_dir.join("helloworld.wasm"), binary)?;
+    fs::write(out_dir.join("helloworld.wasm"), &binary)?;
+
+    println!("cargo:rerun-if-changed=src/helloworld.wast");
+    println!("cargo:rerun-if-changed=x86_64-mycelium.json");
     Ok(())
 }