2 files changed, 4 insertions, 2 deletions
diff --git a/compiler/rustc_codegen_gcc/build_system/src/main.rs b/compiler/rustc_codegen_gcc/build_system/src/main.rs
index 39361718306..c70b00e09ae 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/main.rs
+++ b/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() {
diff --git a/compiler/rustc_codegen_gcc/build_system/src/utils.rs b/compiler/rustc_codegen_gcc/build_system/src/utils.rs
index 401c23948e5..ca177a5feb8 100644
--- a/compiler/rustc_codegen_gcc/build_system/src/utils.rs
+++ b/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;
 }