rewrite metadata-dep-info to rmake

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -98,7 +98,6 @@ run-make/lto-smoke-c/Makefile
 run-make/macos-deployment-target/Makefile
 run-make/macos-fat-archive/Makefile
 run-make/manual-link/Makefile
-run-make/metadata-dep-info/Makefile
 run-make/min-global-align/Makefile
 run-make/mingw-export-call-convention/Makefile
 run-make/mismatching-target-triples/Makefile

tests/run-make/metadata-dep-info/rmake.rs

@@ -0,0 +1,20 @@
+// Emitting dep-info alongside metadata would present subtle discrepancies
+// in the output file, such as the filename transforming underscores_ into hyphens-.
+// After the fix in #114750, this test checks that the emitted files are identical
+// to the expected output.
+// See https://github.com/rust-lang/rust/issues/68839
+
+use run_make_support::{diff, rustc};
+
+fn main() {
+    rustc()
+        .emit("metadata,dep-info")
+        .crate_type("lib")
+        .input("dash-separated.rs")
+        .extra_filename("_something-extra")
+        .run();
+    diff()
+        .expected_file("dash-separated_something-extra.expected.d")
+        .actual_file("dash-separated_something-extra.d")
+        .run();
+}