Rollup merge of #127985 - Oneirical:testibule-of-hell, r=Kobzol

Migrate `test-benches`, `c-unwind-abi-catch-panic` and `compiler-lookup-paths-2` `run-make` tests to rmake

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

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -2,10 +2,8 @@ run-make/branch-protection-check-IBT/Makefile
 run-make/c-dynamic-dylib/Makefile
 run-make/c-dynamic-rlib/Makefile
 run-make/c-unwind-abi-catch-lib-panic/Makefile
-run-make/c-unwind-abi-catch-panic/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
 run-make/cdylib-dylib-linkage/Makefile
-run-make/compiler-lookup-paths-2/Makefile
 run-make/compiler-rt-works-on-mingw/Makefile
 run-make/cross-lang-lto-clang/Makefile
 run-make/cross-lang-lto-pgo-smoketest/Makefile
@@ -90,7 +88,6 @@ run-make/staticlib-dylib-linkage/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/symbol-visibility/Makefile
 run-make/sysroot-crates-are-unstable/Makefile
-run-make/test-benches/Makefile
 run-make/thumb-none-cortex-m/Makefile
 run-make/thumb-none-qemu/Makefile
 run-make/translation/Makefile

tests/run-make/c-unwind-abi-catch-panic/rmake.rs

@@ -0,0 +1,18 @@
+// A test for calling `C-unwind` functions across foreign function boundaries (FFI).
+// This test triggers a panic when calling a foreign function that calls *back* into Rust.
+// This catches a panic across an FFI boundary and downcasts it into an integer.
+// The Rust code that panics is in the same directory, unlike `c-unwind-abi-catch-lib-panic`.
+// See https://github.com/rust-lang/rust/pull/76570
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+//@ needs-unwind
+// Reason: this test exercises panic unwinding
+
+use run_make_support::{build_native_static_lib, run, rustc};
+
+fn main() {
+    build_native_static_lib("add");
+    rustc().input("main.rs").run();
+    run("main");
+}

tests/run-make/compiler-lookup-paths-2/rmake.rs

@@ -0,0 +1,20 @@
+// This test checks that extern crate declarations in Cargo without a corresponding declaration
+// in the manifest of a dependency are NOT allowed. The last rustc call does it anyways, which
+// should result in a compilation failure.
+// See https://github.com/rust-lang/rust/pull/21113
+
+use run_make_support::{path, rfs, rust_lib_name, rustc};
+
+fn main() {
+    rfs::create_dir("a");
+    rfs::create_dir("b");
+    rustc().input("a.rs").run();
+    rfs::rename(rust_lib_name("a"), path("a").join(rust_lib_name("a")));
+    rustc().input("b.rs").library_search_path("a").run();
+    rfs::rename(rust_lib_name("b"), path("b").join(rust_lib_name("b")));
+    rustc()
+        .input("c.rs")
+        .library_search_path("crate=b")
+        .library_search_path("dependency=a")
+        .run_fail();
+}

tests/run-make/test-benches/rmake.rs

@@ -0,0 +1,22 @@
+// #[bench] is a Rust feature to run benchmarks on performance-critical
+// code, which previously experienced a runtime panic bug in #103794.
+// In order to ensure future breakages of this feature are detected, this
+// smoke test was created, using the benchmarking feature with various
+// runtime flags.
+// See https://github.com/rust-lang/rust/issues/103794
+
+//@ ignore-cross-compile
+// Reason: the compiled binary is executed
+//@ needs-unwind
+// Reason: #[bench] and -Zpanic-abort-tests can't be combined
+
+use run_make_support::{run, run_with_args, rustc};
+
+fn main() {
+    // Smoke-test that #[bench] isn't entirely broken.
+    rustc().arg("--test").input("smokebench.rs").opt().run();
+    run_with_args("smokebench", &["--bench"]);
+    run_with_args("smokebench", &["--bench", "noiter"]);
+    run_with_args("smokebench", &["--bench", "yesiter"]);
+    run("smokebench");
+}