rewrite return-non-c-like-enum-from-c to rmake

Author: Oneirical

src/tools/run-make-support/src/lib.rs

@@ -328,6 +328,26 @@ pub fn count_regex_matches_in_files_with_extension(re: &regex::Regex, ext: &str)
     count
 }
 
+/// Builds a static lib (`.lib` on Windows MSVC and `.a` for the rest) with the given name.
+#[track_caller]
+pub fn build_native_static_lib(lib_name: &str) -> PathBuf {
+    let obj_file = if is_msvc() { format!("{lib_name}") } else { format!("{lib_name}.o") };
+    let src = format!("{lib_name}.c");
+    let lib_path = static_lib_name(lib_name);
+    if is_msvc() {
+        cc().arg("-c").out_exe(&obj_file).input(src).run();
+    } else {
+        cc().arg("-v").arg("-c").out_exe(&obj_file).input(src).run();
+    };
+    let mut obj_file = PathBuf::from(format!("{lib_name}.o"));
+    if is_msvc() {
+        obj_file.set_extension("");
+        obj_file.set_extension("obj");
+    }
+    llvm_ar().obj_to_ar().output_input(&lib_path, &obj_file).run();
+    path(lib_path)
+}
+
 /// Use `cygpath -w` on a path to get a Windows path string back. This assumes that `cygpath` is
 /// available on the platform!
 #[track_caller]

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -83,7 +83,6 @@ run-make/no-alloc-shim/Makefile
 run-make/no-builtins-attribute/Makefile
 run-make/no-duplicate-libs/Makefile
 run-make/panic-abort-eh_frame/Makefile
-run-make/pass-non-c-like-enum-to-c/Makefile
 run-make/pdb-buildinfo-cl-cmd/Makefile
 run-make/pgo-gen-lto/Makefile
 run-make/pgo-gen-no-imp-symbols/Makefile

tests/run-make/return-non-c-like-enum-from-c/Makefile

@@ -0,0 +1,17 @@
+// A reversed version of the `return-non-c-like-enum` test, though
+// this time, the C code is the library, and the Rust code compiles
+// into the executable. Once again, enum variants should be treated
+// like an union of structs, which should prevent segfaults or
+// unexpected results.
+// See https://github.com/rust-lang/rust/issues/68190
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+
+use run_make_support::{build_native_static_lib, run, rustc};
+
+fn main() {
+    build_native_static_lib("test");
+    rustc().input("nonclike.rs").arg("-ltest").run();
+    run("nonclike");
+}