rewrite libs-through-symlinks to rmake

Author: Oneirical

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -8,7 +8,6 @@ run-make/extern-fn-reachable/Makefile
 run-make/incr-add-rust-src-component/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile
 run-make/jobserver-error/Makefile
-run-make/libs-through-symlinks/Makefile
 run-make/libtest-json/Makefile
 run-make/libtest-junit/Makefile
 run-make/libtest-thread-limit/Makefile

tests/run-make/libs-through-symlinks/Makefile

@@ -0,0 +1,14 @@
+// The rust compiler searches by default for libraries in its current directory,
+// but used to have difficulty following symlinks leading to required libraries
+// if the real ones were located elsewhere. After this was fixed in #13903, this test
+// checks that compilation succeeds through use of the symlink.
+// See https://github.com/rust-lang/rust/issues/13890
+
+use run_make_support::{cwd, path, rfs, rust_lib_name, rustc};
+
+fn main() {
+    rfs::create_dir("outdir");
+    rustc().input("foo.rs").output(path("outdir").join(rust_lib_name("foo"))).run();
+    rfs::create_symlink(path("outdir").join(rust_lib_name("foo")), rust_lib_name("foo"));
+    rustc().env("RUSTC_LOG", "rustc_metadata::loader").input("bar.rs").run();
+}