Merge commit '6ba33f5e1189a5ae58fb96ce3546e76b13d090f5' into subtree-update_cg_gcc_2025-05-14

compiler/rustc_codegen_gcc/build_system/src/main.rs

@@ -60,7 +60,9 @@ pub enum Command {
 
 fn main() {
     if env::var("RUST_BACKTRACE").is_err() {
-        env::set_var("RUST_BACKTRACE", "1");
+        unsafe {
+            env::set_var("RUST_BACKTRACE", "1");
+        }
     }
 
     let command = match env::args().nth(1).as_deref() {

compiler/rustc_codegen_gcc/build_system/src/utils.rs

@@ -10,7 +10,7 @@ use std::path::{Path, PathBuf};
 use std::process::{Command, ExitStatus, Output};
 
 #[cfg(unix)]
-extern "C" {
+unsafe extern "C" {
     fn raise(signal: c_int) -> c_int;
 }