add safety comment

Eclips4 · Eclips4 · commit bc026f5919f1 · 2026-03-24T18:11:10.000+02:00
diff --git a/Modules/cpython-sys/build.rs b/Modules/cpython-sys/build.rs
@@ -70,7 +70,8 @@ fn prefer_newest_libclang() {
     }
     if let Some((ver, lib_dir)) = best {
         eprintln!("cpython-sys: using libclang from llvm-{ver}");
-        env::set_var("LIBCLANG_PATH", &lib_dir);
+        // SAFETY: build scripts are single-threaded.
+        unsafe { env::set_var("LIBCLANG_PATH", &lib_dir) };
     }
 }
 

Original file line number	Diff line number	Diff line change
`@@ -70,7 +70,8 @@ fn prefer_newest_libclang() {`
`70`	`70`	`}`
`71`	`71`	`if let Some((ver, lib_dir)) = best {`
`72`	`72`	`eprintln!("cpython-sys: using libclang from llvm-{ver}");`
`73`		`- env::set_var("LIBCLANG_PATH", &lib_dir);`
	`73`	`+ // SAFETY: build scripts are single-threaded.`
	`74`	`+ unsafe { env::set_var("LIBCLANG_PATH", &lib_dir) };`
`74`	`75`	`}`
`75`	`76`	`}`
`76`	`77`