migrate tests/run-make/llvm-outputs to use rmake.rs

part of #121876

src/tools/run-make-support/src/rustc.rs

@@ -107,6 +107,13 @@ impl Rustc {
         self
     }
 
+	/// Specify path to the output directory. Equivalent to `--out-dir`` in rustc.
+    pub fn out_dir<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+		self.cmd.arg("--out-dir");
+		self.cmd.arg(path.as_ref());
+		self
+	}
+
     /// This flag defers LTO optimizations to the linker.
     pub fn linker_plugin_lto(&mut self, option: &str) -> &mut Self {
         self.cmd.arg(format!("-Clinker-plugin-lto={option}"));

tests/run-make/llvm-outputs/rmake.rs

@@ -0,0 +1,22 @@
+// test that directories get created when emitting llvm bitcode and IR
+
+use run_make_support::{rustc, run_in_tmpdir, cwd};
+use std::path::PathBuf;
+
+fn main() {
+	let mut path_bc = PathBuf::new();
+	let mut path_ir = PathBuf::new();
+	run_in_tmpdir(|| {
+		let p = cwd();
+		path_bc = p.join("nonexistant_dir_bc");
+		path_ir = p.join("nonexistant_dir_ir");
+		rustc().input("-").stdin("fn main() {}")
+			.out_dir(&path_bc).arg("--emit=llvm-bc").run();
+		rustc().input("-").stdin("fn main() {}")
+			.out_dir(&path_ir).arg("--emit=llvm-ir").run();
+		assert!(path_bc.exists());
+		assert!(path_ir.exists());
+	});
+	assert!(!path_bc.exists());
+	assert!(!path_ir.exists());
+}