split-dwarf: add documentation and test coverage

1 files changed, 7 insertions, 0 deletions

diff --git a/src/tools/run-make-support/src/external_deps/rustc.rs b/src/tools/run-make-support/src/external_deps/rustc.rs
index b74b1d5e166..b461a24a061 100644
--- a/src/tools/run-make-support/src/external_deps/rustc.rs
+++ b/src/tools/run-make-support/src/external_deps/rustc.rs
@@ -366,6 +366,13 @@ impl Rustc {
         self
     }
 
+    pub fn split_dwarf_out_dir(&mut self, out_dir: Option<&str>) -> &mut Self {
+        if let Some(out_dir) = out_dir {
+            self.cmd.arg(format!("-Zsplit-dwarf-out-dir={out_dir}"));
+        }
+        self
+    }
+
     /// Pass the `--verbose` flag.
     pub fn verbose(&mut self) -> &mut Self {
         self.cmd.arg("--verbose");