global: per crate build.rs

crates/brk/Cargo.toml

@@ -7,7 +7,7 @@ homepage.workspace = true
 repository.workspace = true
 edition.workspace = true
 version.workspace = true
-build = "../../build.rs"
+build = "build.rs"
 
 [features]
 full = [

crates/brk/build.rs

@@ -0,0 +1,8 @@
+fn main() {
+    let profile = std::env::var("PROFILE").unwrap_or_default();
+
+    if profile == "release" {
+        println!("cargo:rustc-flag=-C");
+        println!("cargo:rustc-flag=target-cpu=native");
+    }
+}