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 +1,20 @@
+// test that directories get created when emitting llvm bitcode and IR
+
+use run_make_support::{cwd, run_in_tmpdir, rustc};
+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());
+}