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Description: refuse to build optimized on non-sse2 x86
Leads to unsound code due to a bug in LLVM.
Author: Jonas Smedegaard <dr@jones.dk>
Author: noisycoil@tutanota.com
Bug: https://github.com/Lokathor/wide/issues/174
Bug-Debian: https://bugs.debian.org/1078905
Bug-Rust: https://github.com/rust-lang/rust/issues/114479
Bug-LLVM: https://github.com/llvm/llvm-project/issues/44218
Last-Update: 2024-08-27
---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,15 @@
+use std::env::var;
+
+fn main() {
+ let target_arch = var("CARGO_CFG_TARGET_ARCH").unwrap();
+ let target_have_sse2 = var("CARGO_CFG_TARGET_FEATURE")
+ .map_or(false, |features| {
+ features.split(",").any(|feature| feature == "sse2")
+ });
+ let opt_level = var("OPT_LEVEL").unwrap_or_else(|_| "0".to_string());
+
+ if &target_arch == "x86" && !target_have_sse2 && opt_level != "0" {
+ println!("cargo:warning=Compiling optimized code on Debian non-SSE2 i686 architecture leads to unsound code. Build will be aborted.");
+ std::process::exit(1);
+ }
+}
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