Rollup merge of #125674 - Oneirical:another-day-another-test, r=jieyouxu

Rewrite `symlinked-extern`, `symlinked-rlib` and `symlinked-libraries` `run-make` tests in `rmake.rs` format

Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).

try-job: x86_64-msvc

2 files changed, 28 insertions, 3 deletions

diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs
index b920f9a07db..9ec20bf8fd4 100644
--- a/src/tools/run-make-support/src/lib.rs
+++ b/src/tools/run-make-support/src/lib.rs
@@ -93,6 +93,34 @@ pub fn source_root() -> PathBuf {
     env_var("SOURCE_ROOT").into()
 }
 
+/// Creates a new symlink to a path on the filesystem, adjusting for Windows or Unix.
+#[cfg(target_family = "windows")]
+pub fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) {
+    if link.as_ref().exists() {
+        std::fs::remove_dir(link.as_ref()).unwrap();
+    }
+    use std::os::windows::fs;
+    fs::symlink_file(original.as_ref(), link.as_ref()).expect(&format!(
+        "failed to create symlink {:?} for {:?}",
+        link.as_ref().display(),
+        original.as_ref().display(),
+    ));
+}
+
+/// Creates a new symlink to a path on the filesystem, adjusting for Windows or Unix.
+#[cfg(target_family = "unix")]
+pub fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) {
+    if link.as_ref().exists() {
+        std::fs::remove_dir(link.as_ref()).unwrap();
+    }
+    use std::os::unix::fs;
+    fs::symlink(original.as_ref(), link.as_ref()).expect(&format!(
+        "failed to create symlink {:?} for {:?}",
+        link.as_ref().display(),
+        original.as_ref().display(),
+    ));
+}
+
 /// Construct the static library name based on the platform.
 pub fn static_lib_name(name: &str) -> String {
     // See tools.mk (irrelevant lines omitted):
diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index 87185eef952..a4d19eee980 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -227,9 +227,6 @@ run-make/std-core-cycle/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/symbol-visibility/Makefile
 run-make/symbols-include-type-name/Makefile
-run-make/symlinked-extern/Makefile
-run-make/symlinked-libraries/Makefile
-run-make/symlinked-rlib/Makefile
 run-make/sysroot-crates-are-unstable/Makefile
 run-make/target-cpu-native/Makefile
 run-make/target-specs/Makefile