Fix lib path

Author: antoyo

compiler/rustc_codegen_gcc/src/lib.rs

@@ -97,6 +97,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_middle::util::Providers;
 use rustc_session::Session;
 use rustc_session::config::{OptLevel, OutputFilenames};
+use rustc_session::filesearch::make_target_lib_path;
 use rustc_span::Symbol;
 use rustc_target::spec::{Arch, RelocModel};
 use tempfile::TempDir;
@@ -186,9 +187,8 @@ fn load_libgccjit_if_needed(sysroot_path: &Path, target_triple: &str) {
         return;
     }
 
-    let sysroot_lib_dir = sysroot_path.join("lib").join("rustlib");
     let libgccjit_target_lib_file =
-        sysroot_lib_dir.join(target_triple).join("lib").join("libgccjit.so");
+        make_target_lib_path(sysroot_path, target_triple).join("libgccjit.so");
     let path = libgccjit_target_lib_file.to_str().expect("libgccjit path");
 
     let string = CString::new(path).expect("string to libgccjit path");