From 89a6cc1ee6ee3155513cbc6c105491e46e2ddfc9 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Wed, 29 Mar 2023 11:10:37 -0700 Subject: [PATCH] Remove some rerun-if-env-changed lines from build.rs. (#576) Now that we appear to have a known-working fix for #526, we can investigate relaxing the fix. If #526 reappears, we now have a known-working state we can quickly revert to. Reports in #562 and #575 are that having rerun-if-env-changed=RUSTC and rerun-if-env-changed=RUSTC_WRAPPER are triggering spurious rebuilds in some situations, so remove these. In theory, cargo should already be aware of these environment variables. In practice, there were reports of build failures which had the appearance of using an older version of rustc with build.rs output from a newer version of rustc, and it wasn't clear what was happening. But, it's possible that #563 fixes the issue properly. So let's try removing these rerun-if-env-changed lines, and see if the problem resurfaces. And, rerun-if-env-changed=TARGET is explicitly documented as being unnecessary [here]. [here]: https://doc.rust-lang.org/cargo/reference/build-scripts.html --- build.rs | 5 ----- 1 file changed, 5 deletions(-) diff --git a/build.rs b/build.rs index ef96dd0a3..d8d1c8bd6 100644 --- a/build.rs +++ b/build.rs @@ -147,11 +147,6 @@ fn main() { println!("cargo:rerun-if-env-changed=CARGO_FEATURE_USE_LIBC"); println!("cargo:rerun-if-env-changed=CARGO_FEATURE_RUSTC_DEP_OF_STD"); println!("cargo:rerun-if-env-changed=CARGO_CFG_MIRI"); - println!("cargo:rerun-if-env-changed=CARGO_ENCODED_RUSTFLAGS"); - println!("cargo:rerun-if-env-changed=RUSTC"); - println!("cargo:rerun-if-env-changed=TARGET"); - println!("cargo:rerun-if-env-changed=RUSTC_WRAPPER"); - println!("cargo:rerun-if-env-changed=PROFILE"); } /// Link in the desired version of librustix_outline_{arch}.a, containing the