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

Author: Oneirical

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

@@ -31,8 +31,8 @@ pub use cc::{cc, extra_c_flags, extra_cxx_flags, Cc};
 pub use clang::{clang, Clang};
 pub use diff::{diff, Diff};
 pub use llvm::{
-    llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmFilecheck, LlvmObjdump,
-    LlvmProfdata, LlvmReadobj,
+    llvm_ar, llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmAr, LlvmFilecheck,
+    LlvmObjdump, LlvmProfdata, LlvmReadobj,
 };
 pub use run::{cmd, run, run_fail, run_with_args};
 pub use rustc::{aux_build, bare_rustc, rustc, Rustc};
@@ -317,6 +317,26 @@ 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/run-make-support/src/llvm.rs

@@ -29,6 +29,12 @@ pub fn llvm_objdump() -> LlvmObjdump {
     LlvmObjdump::new()
 }
 
+/// Construct a new `llvm-ar` invocation. This assumes that `llvm-ar` is available
+/// at `$LLVM_BIN_DIR/llvm-ar`.
+pub fn llvm_ar() -> LlvmAr {
+    LlvmAr::new()
+}
+
 /// A `llvm-readobj` invocation builder.
 #[derive(Debug)]
 #[must_use]
@@ -57,10 +63,18 @@ pub struct LlvmObjdump {
     cmd: Command,
 }
 
+/// A `llvm-ar` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmAr {
+    cmd: Command,
+}
+
 crate::impl_common_helpers!(LlvmReadobj);
 crate::impl_common_helpers!(LlvmProfdata);
 crate::impl_common_helpers!(LlvmFilecheck);
 crate::impl_common_helpers!(LlvmObjdump);
+crate::impl_common_helpers!(LlvmAr);
 
 /// Generate the path to the bin directory of LLVM.
 #[must_use]
@@ -204,3 +218,26 @@ impl LlvmObjdump {
         self
     }
 }
+
+impl LlvmAr {
+    /// Construct a new `llvm-ar` invocation. This assumes that `llvm-ar` is available
+    /// at `$LLVM_BIN_DIR/llvm-ar`.
+    pub fn new() -> Self {
+        let llvm_ar = llvm_bin_dir().join("llvm-ar");
+        let cmd = Command::new(llvm_ar);
+        Self { cmd }
+    }
+
+    pub fn obj_to_ar(&mut self) -> &mut Self {
+        self.cmd.arg("rcus");
+        self
+    }
+
+    /// Provide an output, then an input file. Bundled in one function, as llvm-ar has
+    /// no "--output"-style flag.
+    pub fn output_input(&mut self, out: impl AsRef<Path>, input: impl AsRef<Path>) -> &mut Self {
+        self.cmd.arg(out.as_ref());
+        self.cmd.arg(input.as_ref());
+        self
+    }
+}

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -92,7 +92,6 @@ run-make/no-builtins-attribute/Makefile
 run-make/no-duplicate-libs/Makefile
 run-make/obey-crate-type-flag/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");
+}