rewrite lto-smoke to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -145,7 +145,6 @@ run-make/lto-linkage-used-attr/Makefile
 run-make/lto-no-link-whole-rlib/Makefile
 run-make/lto-readonly-lib/Makefile
 run-make/lto-smoke-c/Makefile
-run-make/lto-smoke/Makefile
 run-make/macos-deployment-target/Makefile
 run-make/macos-fat-archive/Makefile
 run-make/manual-crate-name/Makefile

tests/run-make/lto-smoke/Makefile

@@ -0,0 +1,13 @@
+// A simple smoke test to check that link time optimization
+// (LTO) works as intended, with its various flags turned on.
+// See https://github.com/rust-lang/rust/issues/10741
+
+//@ ignore-cross-compile
+
+fn main() {
+    let lto_flags = ["-Clto", "-Clto=yes", "-Clto=off", "-Clto=thin", "-Clto=fat"];
+    for flag in lto_flags {
+        rustc().input(lib.rs).run();
+        rustc().input(main.rs).arg(flag).run();
+    }
+}