From 7320db98d1e31e5f3c0770052cf651c308e7e24e Mon Sep 17 00:00:00 2001
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Tue, 5 Jul 2022 17:27:51 +0200
Subject: [PATCH] Add rerun-if-changed to fiber/build.rs (#4377)

Not having rerun-if-changed leads to including nanosecond-precision
mtimes in fingerprints and unnecessary rebuilds in docker [1].

[1] https://github.com/rust-lang/cargo/blob/0.63.1/src/cargo/core/compiler/fingerprint.rs#L1491
---
 crates/fiber/build.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/fiber/build.rs b/crates/fiber/build.rs
index 9e7b8b5a39..6bfc5c4b9d 100644
--- a/crates/fiber/build.rs
+++ b/crates/fiber/build.rs
@@ -5,13 +5,16 @@ fn main() {
     let arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
     let os = env::var("CARGO_CFG_TARGET_OS").unwrap();
     if os == "windows" {
+        println!("cargo:rerun-if-changed=src/windows.c");
         build.file("src/windows.c");
     } else if arch == "s390x" {
+        println!("cargo:rerun-if-changed=src/unix/s390x.S");
         build.file("src/unix/s390x.S");
     } else {
         // assume that this is included via inline assembly in the crate itself,
         // and the crate will otherwise have a `compile_error!` for unsupported
         // platforms.
+        println!("cargo:rerun-if-changed=build.rs");
         return;
     }
     build.define(&format!("CFG_TARGET_OS_{}", os), None);