rustbuild: Tighten dependencies of build scripts

Ensure that `rerun-if-changed` is printed for all build scripts to ensure that
they've all got the right list of dependencies.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/rustc/libc_shim/build.rs b/src/rustc/libc_shim/build.rs
index bc428d69082..546f60482e7 100644
--- a/src/rustc/libc_shim/build.rs
+++ b/src/rustc/libc_shim/build.rs
@@ -8,8 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deny(warnings)]
+
 // See comments in Cargo.toml for why this exists
 
 fn main() {
     println!("cargo:rustc-cfg=stdbuild");
+    println!("cargo:rerun-if-changed=build.rs");
 }