Auto merge of #127338 - Oneirical:ready-your-arbatests, r=<try>

Migrate `extra-filename-with-temp-outputs` and `issue-85019-moved-src-dir` `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).

Please try:

try-job: armhf-gnu
// try-job: test-various // already tried
try-job: x86_64-msvc
try-job: aarch64-apple

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

@@ -303,6 +303,11 @@ pub fn filename_not_in_denylist<P: AsRef<Path>, V: AsRef<[String]>>(path: P, exp
         .is_some_and(|name| !expected.contains(&name.to_str().unwrap().to_owned()))
 }
 
+/// Returns true if the filename at `path` ends with `suffix`.
+pub fn has_suffix<P: AsRef<Path>>(path: P, suffix: &str) -> bool {
+    path.as_ref().file_name().is_some_and(|name| name.to_str().unwrap().ends_with(suffix))
+}
+
 /// 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

@@ -39,7 +39,6 @@ run-make/extern-fn-with-packed-struct/Makefile
 run-make/extern-fn-with-union/Makefile
 run-make/extern-multiple-copies/Makefile
 run-make/extern-multiple-copies2/Makefile
-run-make/extra-filename-with-temp-outputs/Makefile
 run-make/fmt-write-bloat/Makefile
 run-make/foreign-double-unwind/Makefile
 run-make/foreign-exceptions/Makefile
@@ -66,7 +65,6 @@ run-make/issue-69368/Makefile
 run-make/issue-83045/Makefile
 run-make/issue-83112-incr-test-moved-file/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile
-run-make/issue-85019-moved-src-dir/Makefile
 run-make/issue-85401-static-mir/Makefile
 run-make/issue-88756-default-output/Makefile
 run-make/issue-97463-abi-param-passing/Makefile

tests/run-make/extra-filename-with-temp-outputs/rmake.rs

@@ -0,0 +1,23 @@
+// In order to prevent temporary files from overwriting each other in parallel
+// compilation, rustc was changed to mix an extra filename with temporary
+// outputs. However, as this is a similar behavior with the codegen flag
+// -C extra-filename, this test checks that the manually passed flag
+// is not overwritten by this feature, and that the output files
+// are named as expected.
+// See https://github.com/rust-lang/rust/pull/15686
+
+//FIXME(Oneirical): ignore-cross-compile
+
+use run_make_support::{
+    bin_name, cwd, fs_wrapper, has_prefix, has_suffix, rustc, shallow_find_files,
+};
+
+fn main() {
+    rustc().extra_filename("bar").input("foo.rs").arg("-Csave-temps").run();
+    let object_files = shallow_find_files(cwd(), |path| {
+        has_prefix(path, "foobar.foo") && has_suffix(path, "0.rcgu.o")
+    });
+    let object_file = object_files.get(0).unwrap();
+    fs_wrapper::remove_file(object_file);
+    fs_wrapper::remove_file(bin_name("foobar"));
+}

tests/run-make/moved-src-dir-fingerprint-ice/rmake.rs

@@ -0,0 +1,38 @@
+// A SourceFile created during compilation may have a relative
+// path (e.g. if rustc itself is invoked with a relative path).
+// When we write out crate metadata, we convert all relative paths
+// to absolute paths using the current working directory.
+// However, the working directory was previously not included in the crate hash.
+// This meant that the crate metadata could change while the crate
+// hash remained the same. Among other problems, this could cause a
+// fingerprint mismatch ICE, since incremental compilation uses
+// the crate metadata hash to determine if a foreign query is green.
+// This test checks that we don't get an ICE when the working directory
+// (but not the build directory!) changes between compilation
+// sessions.
+// See https://github.com/rust-lang/rust/issues/85019
+
+//@ ignore-none
+// Reason: no-std is not supported
+//@ ignore-nvptx64-nvidia-cuda
+// FIXME: can't find crate for 'std'
+
+use run_make_support::{fs_wrapper, rust_lib_name, rustc};
+
+fn main() {
+    fs_wrapper::create_dir("incr");
+    fs_wrapper::create_dir("first_src");
+    fs_wrapper::create_dir("output");
+    fs_wrapper::rename("my_lib.rs", "first_src/my_lib.rs");
+    fs_wrapper::rename("main.rs", "first_src/main.rs");
+    // Build from "first_src"
+    std::env::set_current_dir("first_src").unwrap();
+    rustc().input("my_lib.rs").incremental("incr").crate_type("lib").run();
+    rustc().input("main.rs").incremental("incr").extern_("my_lib", rust_lib_name("my_lib")).run();
+    std::env::set_current_dir("..").unwrap();
+    fs_wrapper::rename("first_src", "second_src");
+    std::env::set_current_dir("second_src").unwrap();
+    // Build from "second_src" - the output and incremental directory remain identical
+    rustc().input("my_lib.rs").incremental("incr").crate_type("lib").run();
+    rustc().input("main.rs").incremental("incr").extern_("my_lib", rust_lib_name("my_lib")).run();
+}