diff --git a/src/tools/run-make-support/src/lib.rs b/src/tools/run-make-support/src/lib.rs
index ba4524c150c46..9e7d917032205 100644
--- a/src/tools/run-make-support/src/lib.rs
+++ b/src/tools/run-make-support/src/lib.rs
@@ -30,7 +30,8 @@ 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_profdata, llvm_readobj, LlvmFilecheck, LlvmProfdata, LlvmReadobj,
+    llvm_filecheck, llvm_objdump, llvm_profdata, llvm_readobj, LlvmFilecheck, LlvmObjdump,
+    LlvmProfdata, LlvmReadobj,
 };
 pub use run::{cmd, run, run_fail, run_with_args};
 pub use rustc::{aux_build, rustc, Rustc};
@@ -214,6 +215,38 @@ pub fn cwd() -> PathBuf {
     env::current_dir().unwrap()
 }
 
+// FIXME(Oneirical): This will no longer be required after compiletest receives the ability
+// to manipulate read-only files. See https://github.com/rust-lang/rust/issues/126334
+/// Ensure that the path P is read-only while the test runs, and restore original permissions
+/// at the end so compiletest can clean up.
+/// This will panic on Windows if the path is a directory (as it would otherwise do nothing)
+#[track_caller]
+pub fn test_while_readonly<P: AsRef<Path>, F: FnOnce() + std::panic::UnwindSafe>(
+    path: P,
+    closure: F,
+) {
+    let path = path.as_ref();
+    if is_windows() && path.is_dir() {
+        eprintln!("This helper function cannot be used on Windows to make directories readonly.");
+        eprintln!(
+            "See the official documentation:
+            https://doc.rust-lang.org/std/fs/struct.Permissions.html#method.set_readonly"
+        );
+        panic!("`test_while_readonly` on directory detected while on Windows.");
+    }
+    let metadata = fs_wrapper::metadata(&path);
+    let original_perms = metadata.permissions();
+
+    let mut new_perms = original_perms.clone();
+    new_perms.set_readonly(true);
+    fs_wrapper::set_permissions(&path, new_perms);
+
+    let success = std::panic::catch_unwind(closure);
+
+    fs_wrapper::set_permissions(&path, original_perms);
+    success.unwrap();
+}
+
 /// Use `cygpath -w` on a path to get a Windows path string back. This assumes that `cygpath` is
 /// available on the platform!
 #[track_caller]
@@ -271,6 +304,34 @@ pub fn set_host_rpath(cmd: &mut Command) {
     });
 }
 
+/// Read the contents of a file that cannot simply be read by
+/// read_to_string, due to invalid utf8 data, then assert that it contains `expected`.
+#[track_caller]
+pub fn invalid_utf8_contains<P: AsRef<Path>>(path: P, expected: &str) {
+    let buffer = fs_wrapper::read(path.as_ref());
+    if !String::from_utf8_lossy(&buffer).contains(expected) {
+        eprintln!("=== FILE CONTENTS (LOSSY) ===");
+        eprintln!("{}", String::from_utf8_lossy(&buffer));
+        eprintln!("=== SPECIFIED TEXT ===");
+        eprintln!("{}", expected);
+        panic!("specified text was not found in file");
+    }
+}
+
+/// Read the contents of a file that cannot simply be read by
+/// read_to_string, due to invalid utf8 data, then assert that it does not contain `expected`.
+#[track_caller]
+pub fn invalid_utf8_not_contains<P: AsRef<Path>>(path: P, expected: &str) {
+    let buffer = fs_wrapper::read(path.as_ref());
+    if String::from_utf8_lossy(&buffer).contains(expected) {
+        eprintln!("=== FILE CONTENTS (LOSSY) ===");
+        eprintln!("{}", String::from_utf8_lossy(&buffer));
+        eprintln!("=== SPECIFIED TEXT ===");
+        eprintln!("{}", expected);
+        panic!("specified text was unexpectedly found in file");
+    }
+}
+
 /// Copy a directory into another.
 pub fn copy_dir_all(src: impl AsRef<Path>, dst: impl AsRef<Path>) {
     fn copy_dir_all_inner(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> io::Result<()> {
diff --git a/src/tools/run-make-support/src/llvm.rs b/src/tools/run-make-support/src/llvm.rs
index 664093e072d72..99bce08fc2387 100644
--- a/src/tools/run-make-support/src/llvm.rs
+++ b/src/tools/run-make-support/src/llvm.rs
@@ -2,8 +2,8 @@ use std::path::{Path, PathBuf};
 
 use crate::{env_var, Command};
 
-/// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
-/// at `$LLVM_BIN_DIR/llvm-readobj`.
+/// Construct a new `llvm-readobj` invocation with the `GNU` output style.
+/// This assumes that `llvm-readobj` is available at `$LLVM_BIN_DIR/llvm-readobj`.
 #[track_caller]
 pub fn llvm_readobj() -> LlvmReadobj {
     LlvmReadobj::new()
@@ -23,6 +23,12 @@ pub fn llvm_filecheck() -> LlvmFilecheck {
     LlvmFilecheck::new()
 }
 
+/// Construct a new `llvm-objdump` invocation. This assumes that `llvm-objdump` is available
+/// at `$LLVM_BIN_DIR/llvm-objdump`.
+pub fn llvm_objdump() -> LlvmObjdump {
+    LlvmObjdump::new()
+}
+
 /// A `llvm-readobj` invocation builder.
 #[derive(Debug)]
 #[must_use]
@@ -44,9 +50,17 @@ pub struct LlvmFilecheck {
     cmd: Command,
 }
 
+/// A `llvm-objdump` invocation builder.
+#[derive(Debug)]
+#[must_use]
+pub struct LlvmObjdump {
+    cmd: Command,
+}
+
 crate::impl_common_helpers!(LlvmReadobj);
 crate::impl_common_helpers!(LlvmProfdata);
 crate::impl_common_helpers!(LlvmFilecheck);
+crate::impl_common_helpers!(LlvmObjdump);
 
 /// Generate the path to the bin directory of LLVM.
 #[must_use]
@@ -56,13 +70,24 @@ pub fn llvm_bin_dir() -> PathBuf {
 }
 
 impl LlvmReadobj {
-    /// Construct a new `llvm-readobj` invocation. This assumes that `llvm-readobj` is available
-    /// at `$LLVM_BIN_DIR/llvm-readobj`.
+    /// Construct a new `llvm-readobj` invocation with the `GNU` output style.
+    /// This assumes that `llvm-readobj` is available at `$LLVM_BIN_DIR/llvm-readobj`.
     #[track_caller]
     pub fn new() -> Self {
         let llvm_readobj = llvm_bin_dir().join("llvm-readobj");
         let cmd = Command::new(llvm_readobj);
-        Self { cmd }
+        let mut readobj = Self { cmd };
+        readobj.elf_output_style("GNU");
+        readobj
+    }
+
+    /// Specify the format of the ELF information.
+    ///
+    /// Valid options are `LLVM` (default), `GNU`, and `JSON`.
+    pub fn elf_output_style(&mut self, style: &str) -> &mut Self {
+        self.cmd.arg("--elf-output-style");
+        self.cmd.arg(style);
+        self
     }
 
     /// Provide an input file.
@@ -76,6 +101,13 @@ impl LlvmReadobj {
         self.cmd.arg("--file-header");
         self
     }
+
+    /// Specify the section to display.
+    pub fn section(&mut self, section: &str) -> &mut Self {
+        self.cmd.arg("--string-dump");
+        self.cmd.arg(section);
+        self
+    }
 }
 
 impl LlvmProfdata {
@@ -131,3 +163,19 @@ impl LlvmFilecheck {
         self
     }
 }
+
+impl LlvmObjdump {
+    /// Construct a new `llvm-objdump` invocation. This assumes that `llvm-objdump` is available
+    /// at `$LLVM_BIN_DIR/llvm-objdump`.
+    pub fn new() -> Self {
+        let llvm_objdump = llvm_bin_dir().join("llvm-objdump");
+        let cmd = Command::new(llvm_objdump);
+        Self { cmd }
+    }
+
+    /// Provide an input file.
+    pub fn input<P: AsRef<Path>>(&mut self, path: P) -> &mut Self {
+        self.cmd.arg(path.as_ref());
+        self
+    }
+}
diff --git a/src/tools/tidy/src/allowed_run_make_makefiles.txt b/src/tools/tidy/src/allowed_run_make_makefiles.txt
index fdd0be79a4de7..6486bffc78308 100644
--- a/src/tools/tidy/src/allowed_run_make_makefiles.txt
+++ b/src/tools/tidy/src/allowed_run_make_makefiles.txt
@@ -11,7 +11,6 @@ run-make/c-unwind-abi-catch-panic/Makefile
 run-make/cat-and-grep-sanity-check/Makefile
 run-make/cdylib-dylib-linkage/Makefile
 run-make/cdylib-fewer-symbols/Makefile
-run-make/comment-section/Makefile
 run-make/compiler-lookup-paths-2/Makefile
 run-make/compiler-lookup-paths/Makefile
 run-make/compiler-rt-works-on-mingw/Makefile
@@ -35,12 +34,10 @@ run-make/emit-shared-files/Makefile
 run-make/emit-stack-sizes/Makefile
 run-make/emit-to-stdout/Makefile
 run-make/env-dep-info/Makefile
-run-make/error-found-staticlib-instead-crate/Makefile
 run-make/error-writing-dependencies/Makefile
 run-make/export-executable-symbols/Makefile
 run-make/extern-diff-internal-name/Makefile
 run-make/extern-flag-disambiguates/Makefile
-run-make/extern-flag-fun/Makefile
 run-make/extern-flag-pathless/Makefile
 run-make/extern-flag-rename-transitive/Makefile
 run-make/extern-fn-explicit-align/Makefile
@@ -61,20 +58,15 @@ run-make/foreign-double-unwind/Makefile
 run-make/foreign-exceptions/Makefile
 run-make/foreign-rust-exceptions/Makefile
 run-make/glibc-staticlib-args/Makefile
-run-make/inaccessible-temp-dir/Makefile
 run-make/include_bytes_deps/Makefile
 run-make/incr-add-rust-src-component/Makefile
 run-make/incr-foreign-head-span/Makefile
-run-make/incremental-debugger-visualizer/Makefile
-run-make/incremental-session-fail/Makefile
 run-make/inline-always-many-cgu/Makefile
 run-make/interdependent-c-libraries/Makefile
 run-make/intrinsic-unreachable/Makefile
 run-make/invalid-library/Makefile
 run-make/invalid-so/Makefile
-run-make/invalid-staticlib/Makefile
 run-make/issue-107094/Makefile
-run-make/issue-10971-temps-dir/Makefile
 run-make/issue-109934-lto-debuginfo/Makefile
 run-make/issue-14698/Makefile
 run-make/issue-15460/Makefile
@@ -93,7 +85,6 @@ run-make/issue-40535/Makefile
 run-make/issue-47384/Makefile
 run-make/issue-47551/Makefile
 run-make/issue-51671/Makefile
-run-make/issue-64153/Makefile
 run-make/issue-68794-textrel-on-minimal-lib/Makefile
 run-make/issue-69368/Makefile
 run-make/issue-83045/Makefile
@@ -140,20 +131,14 @@ run-make/missing-crate-dependency/Makefile
 run-make/mixing-libs/Makefile
 run-make/msvc-opt-minsize/Makefile
 run-make/native-link-modifier-bundle/Makefile
-run-make/native-link-modifier-verbatim-linker/Makefile
-run-make/native-link-modifier-verbatim-rustc/Makefile
 run-make/native-link-modifier-whole-archive/Makefile
 run-make/no-alloc-shim/Makefile
 run-make/no-builtins-attribute/Makefile
-run-make/no-builtins-lto/Makefile
 run-make/no-duplicate-libs/Makefile
 run-make/obey-crate-type-flag/Makefile
 run-make/optimization-remarks-dir-pgo/Makefile
 run-make/optimization-remarks-dir/Makefile
-run-make/output-filename-conflicts-with-directory/Makefile
-run-make/output-filename-overwrites-input/Makefile
 run-make/output-type-permutations/Makefile
-run-make/output-with-hyphens/Makefile
 run-make/override-aliased-flags/Makefile
 run-make/overwrite-input/Makefile
 run-make/panic-abort-eh_frame/Makefile
diff --git a/tests/run-make/comment-section/Makefile b/tests/run-make/comment-section/Makefile
deleted file mode 100644
index d0b98176ffed9..0000000000000
--- a/tests/run-make/comment-section/Makefile
+++ /dev/null
@@ -1,18 +0,0 @@
-# Both GCC and Clang write by default a `.comment` section with compiler information. Rustc received a similar .comment section, so this tests checks that this section properly appears.
-# See https://github.com/rust-lang/rust/commit/74b8d324eb77a8f337b35dc68ac91b0c2c06debc
-
-include ../tools.mk
-
-# only-linux
-
-all:
-	echo 'fn main(){}' | $(RUSTC) - --emit=link,obj -Csave-temps --target=$(TARGET)
-
-	# Check linked output has a `.comment` section with the expected content.
-	readelf -p '.comment' $(TMPDIR)/rust_out | $(CGREP) -F 'rustc version 1.'
-
-	# Check all object files (including temporary outputs) have a `.comment`
-	# section with the expected content.
-	set -e; for f in $(TMPDIR)/*.o; do \
-		readelf -p '.comment' $$f | $(CGREP) -F 'rustc version 1.'; \
-	done
diff --git a/tests/run-make/comment-section/rmake.rs b/tests/run-make/comment-section/rmake.rs
new file mode 100644
index 0000000000000..ad37c24c4724d
--- /dev/null
+++ b/tests/run-make/comment-section/rmake.rs
@@ -0,0 +1,45 @@
+// Both GCC and Clang write by default a `.comment` section with compiler information.
+// Rustc received a similar .comment section, so this tests checks that this section
+// properly appears.
+// See https://github.com/rust-lang/rust/commit/74b8d324eb77a8f337b35dc68ac91b0c2c06debc
+
+//@ only-linux
+
+use std::path::PathBuf;
+
+use run_make_support::llvm_readobj;
+use run_make_support::rustc;
+use run_make_support::{cwd, env_var, read_dir, run_in_tmpdir};
+
+fn main() {
+    let target = env_var("TARGET");
+
+    rustc()
+        .arg("-")
+        .stdin("fn main() {}")
+        .emit("link,obj")
+        .arg("-Csave-temps")
+        .target(&target)
+        .run();
+
+    // Check linked output has a `.comment` section with the expected content.
+    llvm_readobj()
+        .section(".comment")
+        .input("rust_out")
+        .run()
+        .assert_stdout_contains("rustc version 1.");
+
+    // Check all object files (including temporary outputs) have a `.comment`
+    // section with the expected content.
+    read_dir(cwd(), |f| {
+        if !f.extension().is_some_and(|ext| ext == "o") {
+            return;
+        }
+
+        llvm_readobj()
+            .section(".comment")
+            .input(&f)
+            .run()
+            .assert_stdout_contains("rustc version 1.");
+    });
+}
diff --git a/tests/run-make/error-found-staticlib-instead-crate/Makefile b/tests/run-make/error-found-staticlib-instead-crate/Makefile
deleted file mode 100644
index 0eae41d720ccc..0000000000000
--- a/tests/run-make/error-found-staticlib-instead-crate/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-include ../tools.mk
-
-all:
-	$(RUSTC) foo.rs --crate-type staticlib
-	$(RUSTC) bar.rs 2>&1 | $(CGREP) "found staticlib"
diff --git a/tests/run-make/error-found-staticlib-instead-crate/rmake.rs b/tests/run-make/error-found-staticlib-instead-crate/rmake.rs
new file mode 100644
index 0000000000000..8c707092b7e44
--- /dev/null
+++ b/tests/run-make/error-found-staticlib-instead-crate/rmake.rs
@@ -0,0 +1,11 @@
+// When rustc is looking for a crate but is given a staticlib instead,
+// the error message should be helpful and indicate precisely the cause
+// of the compilation failure.
+// See https://github.com/rust-lang/rust/pull/21978
+
+use run_make_support::rustc;
+
+fn main() {
+    rustc().input("foo.rs").crate_type("staticlib").run();
+    rustc().input("bar.rs").run_fail().assert_stderr_contains("found staticlib");
+}
diff --git a/tests/run-make/extern-flag-fun/Makefile b/tests/run-make/extern-flag-fun/Makefile
deleted file mode 100644
index 687cdfd76755b..0000000000000
--- a/tests/run-make/extern-flag-fun/Makefile
+++ /dev/null
@@ -1,20 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) bar.rs --crate-type=rlib
-	$(RUSTC) bar.rs --crate-type=rlib -C extra-filename=-a
-	$(RUSTC) bar-alt.rs --crate-type=rlib
-	$(RUSTC) foo.rs --extern bar=no-exist && exit 1 || exit 0
-	$(RUSTC) foo.rs --extern bar=foo.rs && exit 1 || exit 0
-	$(RUSTC) foo.rs \
-		--extern bar=$(TMPDIR)/libbar.rlib \
-		--extern bar=$(TMPDIR)/libbar-alt.rlib \
-		&& exit 1 || exit 0
-	$(RUSTC) foo.rs \
-		--extern bar=$(TMPDIR)/libbar.rlib \
-		--extern bar=$(TMPDIR)/libbar-a.rlib
-	$(RUSTC) foo.rs --extern bar=$(TMPDIR)/libbar.rlib
-	# Try to be sneaky and load a private crate from with a non-private name.
-	$(RUSTC) rustc.rs -Zforce-unstable-if-unmarked --crate-type=rlib
-	$(RUSTC) gated_unstable.rs --extern alloc=$(TMPDIR)/librustc.rlib 2>&1 | $(CGREP) 'rustc_private'
diff --git a/tests/run-make/extern-flag-fun/rmake.rs b/tests/run-make/extern-flag-fun/rmake.rs
new file mode 100644
index 0000000000000..c1825f6bbb888
--- /dev/null
+++ b/tests/run-make/extern-flag-fun/rmake.rs
@@ -0,0 +1,38 @@
+// The --extern flag can override the default crate search of
+// the compiler and directly fetch a given path. There are a few rules
+// to follow: for example, there can't be more than one rlib, the crates must
+// be valid ("no-exist" in this test), and private crates can't be loaded
+// as non-private. This test checks that these rules are enforced.
+// See https://github.com/rust-lang/rust/pull/15319
+
+use run_make_support::{rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("bar.rs").crate_type("rlib").run();
+    // Exactly the same rlib as the first line, only the filename changes.
+    rustc().input("bar.rs").crate_type("rlib").extra_filename("-a").run();
+    rustc().input("bar-alt.rs").crate_type("rlib").run();
+    // The crate must be valid.
+    rustc().input("foo.rs").extern_("bar", "no-exist").run_fail();
+    rustc().input("foo.rs").extern_("bar", "foo.rs").run_fail();
+    // Compilation fails with two different rlibs.
+    rustc()
+        .input("foo.rs")
+        .extern_("bar", rust_lib_name("bar"))
+        .extern_("bar", rust_lib_name("bar-alt"))
+        .run_fail();
+    // Even though this one has seemingly two rlibs, they are one and the same.
+    rustc()
+        .input("foo.rs")
+        .extern_("bar", rust_lib_name("bar"))
+        .extern_("bar", rust_lib_name("bar-a"))
+        .run();
+    rustc().input("foo.rs").extern_("bar", rust_lib_name("bar")).run();
+    // Try to be sneaky and load a private crate from with a non-private name.
+    rustc().input("rustc.rs").arg("-Zforce-unstable-if-unmarked").crate_type("rlib").run();
+    rustc()
+        .input("gated_unstable.rs")
+        .extern_("alloc", rust_lib_name("rustc"))
+        .run_fail()
+        .assert_stderr_contains("rustc_private");
+}
diff --git a/tests/run-make/inaccessible-temp-dir/Makefile b/tests/run-make/inaccessible-temp-dir/Makefile
deleted file mode 100644
index abdba4eb86145..0000000000000
--- a/tests/run-make/inaccessible-temp-dir/Makefile
+++ /dev/null
@@ -1,32 +0,0 @@
-# only-linux
-# ignore-arm - linker error on `armhf-gnu`
-
-include ../tools.mk
-
-# Issue #66530: We would ICE if someone compiled with `-o /dev/null`,
-# because we would try to generate auxiliary files in `/dev/` (which
-# at least the OS X file system rejects).
-#
-# An attempt to `-Ztemps-dir` into a directory we cannot write into should
-# indeed be an error; but not an ICE.
-#
-# However, some folks run tests as root, which can write `/dev/` and end
-# up clobbering `/dev/null`. Instead we'll use an inaccessible path, which
-# also used to ICE, but even root can't magically write there.
-#
-# Note that `-Ztemps-dir` uses `create_dir_all` so it is not sufficient to
-# use a directory with non-existing parent like `/does-not-exist/output`.
-
-all:
-	# Create an inaccessible directory
-	mkdir $(TMPDIR)/inaccessible
-	chmod 000 $(TMPDIR)/inaccessible
-
-	# Run rustc with `-Ztemps-dir` set to a directory 
-	# *inside* the inaccessible one, so that it can't create it
-	$(RUSTC) program.rs -Ztemps-dir=$(TMPDIR)/inaccessible/tmp 2>&1 \
-		| $(CGREP) 'failed to find or create the directory specified by `--temps-dir`'
-
-	# Make the inaccessible directory accessible,
-	# so that compiletest can delete the temp dir
-	chmod +rw $(TMPDIR)/inaccessible
diff --git a/tests/run-make/inaccessible-temp-dir/rmake.rs b/tests/run-make/inaccessible-temp-dir/rmake.rs
new file mode 100644
index 0000000000000..be24e47b6decc
--- /dev/null
+++ b/tests/run-make/inaccessible-temp-dir/rmake.rs
@@ -0,0 +1,38 @@
+// Issue #66530: We would ICE if someone compiled with `-o /dev/null`,
+// because we would try to generate auxiliary files in `/dev/` (which
+// at least the OS X file system rejects).
+//
+// An attempt to `-Ztemps-dir` into a directory we cannot write into should
+// indeed be an error; but not an ICE.
+//
+// However, some folks run tests as root, which can write `/dev/` and end
+// up clobbering `/dev/null`. Instead we'll use an inaccessible path, which
+// also used to ICE, but even root can't magically write there.
+//
+// Note that `-Ztemps-dir` uses `create_dir_all` so it is not sufficient to
+// use a directory with non-existing parent like `/does-not-exist/output`.
+// See https://github.com/rust-lang/rust/issues/66530
+
+//@ ignore-arm
+// Reason: linker error on `armhf-gnu`
+//@ ignore-windows
+// Reason: `set_readonly` has no effect on directories
+// and does not prevent modification.
+
+use run_make_support::{fs_wrapper, rustc, test_while_readonly};
+
+fn main() {
+    // Create an inaccessible directory.
+    fs_wrapper::create_dir("inaccessible");
+    test_while_readonly("inaccessible", || {
+        // Run rustc with `-Z temps-dir` set to a directory *inside* the inaccessible one,
+        // so that it can't create `tmp`.
+        rustc()
+            .input("program.rs")
+            .arg("-Ztemps-dir=inaccessible/tmp")
+            .run_fail()
+            .assert_stderr_contains(
+                "failed to find or create the directory specified by `--temps-dir`",
+            );
+    });
+}
diff --git a/tests/run-make/incremental-debugger-visualizer/Makefile b/tests/run-make/incremental-debugger-visualizer/Makefile
deleted file mode 100644
index 8cfe41597adf8..0000000000000
--- a/tests/run-make/incremental-debugger-visualizer/Makefile
+++ /dev/null
@@ -1,49 +0,0 @@
-include ../tools.mk
-
-# This test makes sure that changes to files referenced via #[debugger_visualizer]
-# are picked up when compiling incrementally.
-
-# We have to copy the source to $(TMPDIR) because Github CI mounts the source
-# directory as readonly. We need to apply modifications to some of the source
-# file.
-SRC_DIR := $(TMPDIR)/src
-INCR_CACHE_DIR := $(TMPDIR)/incremental
-
-all:
-	rm -rf $(TMPDIR)/*
-	mkdir $(SRC_DIR)
-	cp ./foo.rs $(SRC_DIR)
-	echo "GDB script v1" > $(SRC_DIR)/foo.py
-	echo "Natvis v1" > $(SRC_DIR)/foo.natvis
-	$(RUSTC) $(SRC_DIR)/foo.rs \
-	  --crate-type=rlib \
-	  --emit metadata \
-	  -C incremental=$(INCR_CACHE_DIR) \
-	  -Z incremental-verify-ich
-	$(CGREP) "GDB script v1" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) "Natvis v1" < $(TMPDIR)/libfoo.rmeta
-
-	# Change only the GDB script and check that the change has been picked up
-	echo "GDB script v2" > $(SRC_DIR)/foo.py
-	$(RUSTC) $(SRC_DIR)/foo.rs \
-	  --crate-type=rlib \
-	  --emit metadata \
-	  -C incremental=$(INCR_CACHE_DIR) \
-	  -Z incremental-verify-ich
-
-	$(CGREP) "GDB script v2" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) -v "GDB script v1" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) "Natvis v1" < $(TMPDIR)/libfoo.rmeta
-
-	# Now change the Natvis version and check that the change has been picked up
-	echo "Natvis v2" > $(SRC_DIR)/foo.natvis
-	$(RUSTC) $(SRC_DIR)/foo.rs \
-	  --crate-type=rlib \
-	  --emit metadata \
-	  -C incremental=$(INCR_CACHE_DIR) \
-	  -Z incremental-verify-ich
-
-	$(CGREP) "GDB script v2" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) -v "GDB script v1" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) "Natvis v2" < $(TMPDIR)/libfoo.rmeta
-	$(CGREP) -v "Natvis v1" < $(TMPDIR)/libfoo.rmeta
diff --git a/tests/run-make/incremental-debugger-visualizer/rmake.rs b/tests/run-make/incremental-debugger-visualizer/rmake.rs
new file mode 100644
index 0000000000000..1ef3af873530e
--- /dev/null
+++ b/tests/run-make/incremental-debugger-visualizer/rmake.rs
@@ -0,0 +1,56 @@
+// This test ensures that changes to files referenced via #[debugger_visualizer]
+// (in this case, foo.py and foo.natvis) are picked up when compiling incrementally.
+// See https://github.com/rust-lang/rust/pull/111641
+
+use run_make_support::{fs_wrapper, invalid_utf8_contains, invalid_utf8_not_contains, rustc};
+use std::io::Read;
+
+fn main() {
+    fs_wrapper::create_file("foo.py");
+    fs_wrapper::write("foo.py", "GDB script v1");
+    fs_wrapper::create_file("foo.natvis");
+    fs_wrapper::write("foo.natvis", "Natvis v1");
+    rustc()
+        .input("foo.rs")
+        .crate_type("rlib")
+        .emit("metadata")
+        .incremental("incremental")
+        .arg("-Zincremental-verify-ich")
+        .run();
+
+    invalid_utf8_contains("libfoo.rmeta", "GDB script v1");
+    invalid_utf8_contains("libfoo.rmeta", "Natvis v1");
+
+    // Change only the GDB script and check that the change has been picked up
+    fs_wrapper::remove_file("foo.py");
+    fs_wrapper::create_file("foo.py");
+    fs_wrapper::write("foo.py", "GDB script v2");
+    rustc()
+        .input("foo.rs")
+        .crate_type("rlib")
+        .emit("metadata")
+        .incremental("incremental")
+        .arg("-Zincremental-verify-ich")
+        .run();
+
+    invalid_utf8_contains("libfoo.rmeta", "GDB script v2");
+    invalid_utf8_not_contains("libfoo.rmeta", "GDB script v1");
+    invalid_utf8_contains("libfoo.rmeta", "Natvis v1");
+
+    // Now change the Natvis version and check that the change has been picked up
+    fs_wrapper::remove_file("foo.natvis");
+    fs_wrapper::create_file("foo.natvis");
+    fs_wrapper::write("foo.natvis", "Natvis v2");
+    rustc()
+        .input("foo.rs")
+        .crate_type("rlib")
+        .emit("metadata")
+        .incremental("incremental")
+        .arg("-Zincremental-verify-ich")
+        .run();
+
+    invalid_utf8_contains("libfoo.rmeta", "GDB script v2");
+    invalid_utf8_not_contains("libfoo.rmeta", "GDB script v1");
+    invalid_utf8_not_contains("libfoo.rmeta", "Natvis v1");
+    invalid_utf8_contains("libfoo.rmeta", "Natvis v2");
+}
diff --git a/tests/run-make/incremental-session-fail/Makefile b/tests/run-make/incremental-session-fail/Makefile
deleted file mode 100644
index f43eece2eb709..0000000000000
--- a/tests/run-make/incremental-session-fail/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-include ../tools.mk
-
-SESSION_DIR := $(TMPDIR)/session
-OUTPUT_FILE := $(TMPDIR)/build-output
-
-all:
-	echo $(TMPDIR)
-	# Make it so that rustc will fail to create a session directory.
-	touch $(SESSION_DIR)
-	# Check exit code is 1 for an error, and not 101 for ICE.
-	$(RUSTC) foo.rs --crate-type=rlib -C incremental=$(SESSION_DIR) > $(OUTPUT_FILE) 2>&1; [ $$? -eq 1 ]
-	$(CGREP) "could not create incremental compilation crate directory" < $(OUTPUT_FILE)
-	# -v tests are fragile, hopefully this text won't change
-	$(CGREP) -v "internal compiler error" < $(OUTPUT_FILE)
diff --git a/tests/run-make/incremental-session-fail/rmake.rs b/tests/run-make/incremental-session-fail/rmake.rs
new file mode 100644
index 0000000000000..0283709f2cf8c
--- /dev/null
+++ b/tests/run-make/incremental-session-fail/rmake.rs
@@ -0,0 +1,15 @@
+// Failing to create the directory where output incremental
+// files would be stored used to cause an ICE (Internal Compiler
+// Error). This was patched in #85698, and this test checks that
+// the ensuing compilation failure is not an ICE.
+// See https://github.com/rust-lang/rust/pull/85698
+
+use run_make_support::{fs_wrapper, rustc};
+
+fn main() {
+    fs_wrapper::create_file("session");
+    // rustc should fail to create the session directory here.
+    let out = rustc().input("foo.rs").crate_type("rlib").incremental("session").run_fail();
+    out.assert_stderr_contains("could not create incremental compilation crate directory");
+    out.assert_stderr_not_contains("internal compiler error");
+}
diff --git a/tests/run-make/invalid-staticlib/Makefile b/tests/run-make/invalid-staticlib/Makefile
deleted file mode 100644
index 3f0f74ce3cb02..0000000000000
--- a/tests/run-make/invalid-staticlib/Makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-include ../tools.mk
-
-all:
-	touch $(TMPDIR)/libfoo.a
-	echo | $(RUSTC) - --crate-type=rlib -lstatic=foo 2>&1 | $(CGREP) "failed to add native library"
diff --git a/tests/run-make/invalid-staticlib/rmake.rs b/tests/run-make/invalid-staticlib/rmake.rs
new file mode 100644
index 0000000000000..451292932477c
--- /dev/null
+++ b/tests/run-make/invalid-staticlib/rmake.rs
@@ -0,0 +1,17 @@
+// If the static library provided is not valid (in this test,
+// created as an empty file),
+// rustc should print a normal error message and not throw
+// an internal compiler error (ICE).
+// See https://github.com/rust-lang/rust/pull/28673
+
+use run_make_support::{fs_wrapper, rustc, static_lib_name};
+
+fn main() {
+    fs_wrapper::create_file(static_lib_name("foo"));
+    rustc()
+        .arg("-")
+        .crate_type("rlib")
+        .arg("-lstatic=foo")
+        .run_fail()
+        .assert_stderr_contains("failed to add native library");
+}
diff --git a/tests/run-make/issue-10971-temps-dir/Makefile b/tests/run-make/issue-10971-temps-dir/Makefile
deleted file mode 100644
index 6e1649a58d231..0000000000000
--- a/tests/run-make/issue-10971-temps-dir/Makefile
+++ /dev/null
@@ -1,10 +0,0 @@
-include ../tools.mk
-
-# Regression test for issue #10971
-# Running two invocations in parallel would overwrite each other's temp files.
-
-all:
-	touch $(TMPDIR)/lib.rs
-
-	$(RUSTC) --crate-type=lib -Z temps-dir=$(TMPDIR)/temp1 $(TMPDIR)/lib.rs & \
-	$(RUSTC) --crate-type=staticlib -Z temps-dir=$(TMPDIR)/temp2 $(TMPDIR)/lib.rs
diff --git a/tests/run-make/issue-64153/Makefile b/tests/run-make/issue-64153/Makefile
deleted file mode 100644
index f42ea620fb9d1..0000000000000
--- a/tests/run-make/issue-64153/Makefile
+++ /dev/null
@@ -1,26 +0,0 @@
-include ../tools.mk
-
-# `llvm-objdump`'s output looks different on windows than on other platforms.
-# It should be enough to check on Unix platforms, so:
-# ignore-windows
-
-# Staticlibs don't include Rust object files from upstream crates if the same
-# code was already pulled into the lib via LTO. However, the bug described in
-# https://github.com/rust-lang/rust/issues/64153 lead to this exclusion not
-# working properly if the upstream crate was compiled with an explicit filename
-# (via `-o`).
-#
-# This test makes sure that functions defined in the upstream crates do not
-# appear twice in the final staticlib when listing all the symbols from it.
-
-all:
-	$(RUSTC) --crate-type rlib upstream.rs -o $(TMPDIR)/libupstream.rlib -Ccodegen-units=1
-	$(RUSTC) --crate-type staticlib downstream.rs -Clto -Ccodegen-units=1 -o $(TMPDIR)/libdownstream.a
-	# Dump all the symbols from the staticlib into `syms`
-	"$(LLVM_BIN_DIR)"/llvm-objdump -t $(TMPDIR)/libdownstream.a > $(TMPDIR)/syms
-	# Count the global instances of `issue64153_test_function`. There'll be 2
-	# if the `upstream` object file got erroneously included twice.
-	# The line we are testing for with the regex looks something like:
-	# 0000000000000000 g     F .text.issue64153_test_function	00000023 issue64153_test_function
-	grep -c -e "[[:space:]]g[[:space:]]*F[[:space:]].*issue64153_test_function" $(TMPDIR)/syms > $(TMPDIR)/count
-	[ "$$(cat $(TMPDIR)/count)" -eq "1" ]
diff --git a/tests/run-make/issue-64153/downstream.rs b/tests/run-make/lto-avoid-object-duplication/downstream.rs
similarity index 100%
rename from tests/run-make/issue-64153/downstream.rs
rename to tests/run-make/lto-avoid-object-duplication/downstream.rs
diff --git a/tests/run-make/lto-avoid-object-duplication/rmake.rs b/tests/run-make/lto-avoid-object-duplication/rmake.rs
new file mode 100644
index 0000000000000..b0e7494cb5132
--- /dev/null
+++ b/tests/run-make/lto-avoid-object-duplication/rmake.rs
@@ -0,0 +1,40 @@
+// ignore-tidy-tab
+// Staticlibs don't include Rust object files from upstream crates if the same
+// code was already pulled into the lib via LTO. However, the bug described in
+// https://github.com/rust-lang/rust/issues/64153 lead to this exclusion not
+// working properly if the upstream crate was compiled with an explicit filename
+// (via `-o`).
+
+// This test makes sure that functions defined in the upstream crates do not
+// appear twice in the final staticlib when listing all the symbols from it.
+
+//@ ignore-windows
+// Reason: `llvm-objdump`'s output looks different on windows than on other platforms.
+// Only checking on Unix platforms should suffice.
+//FIXME(Oneirical): This could be adapted to work on Windows by checking how
+// that output differs.
+
+use run_make_support::{llvm_objdump, regex, rust_lib_name, rustc, static_lib_name};
+
+fn main() {
+    rustc()
+        .crate_type("rlib")
+        .input("upstream.rs")
+        .output(rust_lib_name("upstream"))
+        .codegen_units(1)
+        .run();
+    rustc()
+        .crate_type("staticlib")
+        .input("downstream.rs")
+        .arg("-Clto")
+        .output(static_lib_name("downstream"))
+        .codegen_units(1)
+        .run();
+    let syms = llvm_objdump().arg("-t").input(static_lib_name("downstream")).run().stdout_utf8();
+    let re = regex::Regex::new(r#"\s*g\s*F\s.*issue64153_test_function"#).unwrap();
+    // Count the global instances of `issue64153_test_function`. There'll be 2
+    // if the `upstream` object file got erroneously included twice.
+    // The line we are testing for with the regex looks something like:
+    // 0000000000000000 g     F .text.issue64153_test_function	00000023 issue64153_test_function
+    assert_eq!(re.find_iter(syms.as_str()).count(), 1);
+}
diff --git a/tests/run-make/issue-64153/upstream.rs b/tests/run-make/lto-avoid-object-duplication/upstream.rs
similarity index 100%
rename from tests/run-make/issue-64153/upstream.rs
rename to tests/run-make/lto-avoid-object-duplication/upstream.rs
diff --git a/tests/run-make/native-link-modifier-verbatim-linker/Makefile b/tests/run-make/native-link-modifier-verbatim-linker/Makefile
deleted file mode 100644
index 47ed2a1429185..0000000000000
--- a/tests/run-make/native-link-modifier-verbatim-linker/Makefile
+++ /dev/null
@@ -1,15 +0,0 @@
-# ignore-cross-compile
-# ignore-apple
-
-include ../tools.mk
-
-all:
-	# Verbatim allows specify precise name.
-	$(RUSTC) local_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/local_some_strange_name.ext
-	$(RUSTC) main.rs -l static:+verbatim=local_some_strange_name.ext
-
-	# With verbatim any other name cannot be used (local).
-	$(RUSTC) local_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/liblocal_native_dep.a
-	$(RUSTC) local_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/local_native_dep.a
-	$(RUSTC) local_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/local_native_dep.lib
-	$(RUSTC) main.rs -l static:+verbatim=local_native_dep 2>&1 | $(CGREP) "local_native_dep"
diff --git a/tests/run-make/native-link-modifier-verbatim-linker/rmake.rs b/tests/run-make/native-link-modifier-verbatim-linker/rmake.rs
new file mode 100644
index 0000000000000..6868cb368ccc3
--- /dev/null
+++ b/tests/run-make/native-link-modifier-verbatim-linker/rmake.rs
@@ -0,0 +1,41 @@
+// `verbatim` is a native link modifier that forces rustc to only accept libraries with
+// a specified name. This test checks that this modifier works as intended.
+// This test is the same as native-link-modifier-rustc, but without rlibs.
+// See https://github.com/rust-lang/rust/issues/99425
+
+//@ ignore-apple
+// Reason: linking fails due to the unusual ".ext" staticlib name.
+
+use run_make_support::rustc;
+
+fn main() {
+    // Verbatim allows for the specification of a precise name
+    // - in this case, the unconventional ".ext" extension.
+    rustc()
+        .input("local_native_dep.rs")
+        .crate_type("staticlib")
+        .output("local_some_strange_name.ext")
+        .run();
+    rustc().input("main.rs").arg("-lstatic:+verbatim=local_some_strange_name.ext").run();
+
+    // This section voluntarily avoids using static_lib_name helpers to be verbatim.
+    // With verbatim, even these common library names are refused
+    // - it wants local_native_dep without
+    // any file extensions.
+    rustc()
+        .input("local_native_dep.rs")
+        .crate_type("staticlib")
+        .output("liblocal_native_dep.a")
+        .run();
+    rustc().input("local_native_dep.rs").crate_type("staticlib").output("local_native_dep.a").run();
+    rustc()
+        .input("local_native_dep.rs")
+        .crate_type("staticlib")
+        .output("local_native_dep.lib")
+        .run();
+    rustc()
+        .input("main.rs")
+        .arg("-lstatic:+verbatim=local_native_dep")
+        .run_fail()
+        .assert_stderr_contains("local_native_dep");
+}
diff --git a/tests/run-make/native-link-modifier-verbatim-rustc/Makefile b/tests/run-make/native-link-modifier-verbatim-rustc/Makefile
deleted file mode 100644
index dfd6ec50fc008..0000000000000
--- a/tests/run-make/native-link-modifier-verbatim-rustc/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-include ../tools.mk
-
-all:
-	# Verbatim allows specify precise name.
-	$(RUSTC) upstream_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/upstream_some_strange_name.ext
-	$(RUSTC) rust_dep.rs -l static:+verbatim=upstream_some_strange_name.ext --crate-type rlib
-
-	# With verbatim any other name cannot be used (upstream).
-	$(RUSTC) upstream_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/libupstream_native_dep.a
-	$(RUSTC) upstream_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/upstream_native_dep.a
-	$(RUSTC) upstream_native_dep.rs --crate-type=staticlib -o $(TMPDIR)/upstream_native_dep.lib
-	$(RUSTC) rust_dep.rs -l static:+verbatim=upstream_native_dep --crate-type rlib 2>&1 | $(CGREP) "upstream_native_dep"
diff --git a/tests/run-make/native-link-modifier-verbatim-rustc/rmake.rs b/tests/run-make/native-link-modifier-verbatim-rustc/rmake.rs
new file mode 100644
index 0000000000000..703b8a80ef3ed
--- /dev/null
+++ b/tests/run-make/native-link-modifier-verbatim-rustc/rmake.rs
@@ -0,0 +1,47 @@
+// `verbatim` is a native link modifier that forces rustc to only accept libraries with
+// a specified name. This test checks that this modifier works as intended.
+// This test is the same as native-link-modifier-linker, but with rlibs.
+// See https://github.com/rust-lang/rust/issues/99425
+
+use run_make_support::rustc;
+
+fn main() {
+    // Verbatim allows for the specification of a precise name
+    // - in this case, the unconventional ".ext" extension.
+    rustc()
+        .input("upstream_native_dep.rs")
+        .crate_type("staticlib")
+        .output("upstream_some_strange_name.ext")
+        .run();
+    rustc()
+        .input("rust_dep.rs")
+        .crate_type("rlib")
+        .arg("-lstatic:+verbatim=upstream_some_strange_name.ext")
+        .run();
+
+    // This section voluntarily avoids using static_lib_name helpers to be verbatim.
+    // With verbatim, even these common library names are refused
+    // - it wants upstream_native_dep without
+    // any file extensions.
+    rustc()
+        .input("upstream_native_dep.rs")
+        .crate_type("staticlib")
+        .output("libupstream_native_dep.a")
+        .run();
+    rustc()
+        .input("upstream_native_dep.rs")
+        .crate_type("staticlib")
+        .output("upstream_native_dep.a")
+        .run();
+    rustc()
+        .input("upstream_native_dep.rs")
+        .crate_type("staticlib")
+        .output("upstream_native_dep.lib")
+        .run();
+    rustc()
+        .input("rust_dep.rs")
+        .crate_type("rlib")
+        .arg("-lstatic:+verbatim=upstream_native_dep")
+        .run_fail()
+        .assert_stderr_contains("upstream_native_dep");
+}
diff --git a/tests/run-make/no-builtins-lto/Makefile b/tests/run-make/no-builtins-lto/Makefile
deleted file mode 100644
index c8f05d9918b91..0000000000000
--- a/tests/run-make/no-builtins-lto/Makefile
+++ /dev/null
@@ -1,9 +0,0 @@
-include ../tools.mk
-
-all:
-	# Compile a `#![no_builtins]` rlib crate
-	$(RUSTC) no_builtins.rs
-	# Build an executable that depends on that crate using LTO. The no_builtins crate doesn't
-	# participate in LTO, so its rlib must be explicitly linked into the final binary. Verify this by
-	# grepping the linker arguments.
-	$(RUSTC) main.rs -C lto --print link-args | $(CGREP) 'libno_builtins.rlib'
diff --git a/tests/run-make/no-builtins-lto/rmake.rs b/tests/run-make/no-builtins-lto/rmake.rs
new file mode 100644
index 0000000000000..8e0c3a636490f
--- /dev/null
+++ b/tests/run-make/no-builtins-lto/rmake.rs
@@ -0,0 +1,20 @@
+// The rlib produced by a no_builtins crate should be explicitely linked
+// during compilation, and as a result be present in the linker arguments.
+// See the comments inside this file for more details.
+// See https://github.com/rust-lang/rust/pull/35637
+
+use run_make_support::{rust_lib_name, rustc};
+
+fn main() {
+    // Compile a `#![no_builtins]` rlib crate
+    rustc().input("no_builtins.rs").run();
+    // Build an executable that depends on that crate using LTO. The no_builtins crate doesn't
+    // participate in LTO, so its rlib must be explicitly
+    // linked into the final binary. Verify this by grepping the linker arguments.
+    rustc()
+        .input("main.rs")
+        .arg("-Clto")
+        .print("link-args")
+        .run()
+        .assert_stdout_contains(rust_lib_name("no_builtins"));
+}
diff --git a/tests/run-make/output-filename-conflicts-with-directory/Makefile b/tests/run-make/output-filename-conflicts-with-directory/Makefile
deleted file mode 100644
index 45221356cd97f..0000000000000
--- a/tests/run-make/output-filename-conflicts-with-directory/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-include ../tools.mk
-
-all:
-	cp foo.rs $(TMPDIR)/foo.rs
-	mkdir $(TMPDIR)/foo
-	$(RUSTC) $(TMPDIR)/foo.rs -o $(TMPDIR)/foo 2>&1 \
-		| $(CGREP) -e "the generated executable for the input file \".*foo\.rs\" conflicts with the existing directory \".*foo\""
diff --git a/tests/run-make/output-filename-conflicts-with-directory/rmake.rs b/tests/run-make/output-filename-conflicts-with-directory/rmake.rs
new file mode 100644
index 0000000000000..4b5c9e8d1187d
--- /dev/null
+++ b/tests/run-make/output-filename-conflicts-with-directory/rmake.rs
@@ -0,0 +1,14 @@
+// ignore-tidy-linelength
+// When the compiled executable would conflict with a directory, a
+// rustc error should be displayed instead of a verbose and
+// potentially-confusing linker error.
+// See https://github.com/rust-lang/rust/pull/47203
+
+use run_make_support::{fs_wrapper, rustc};
+
+fn main() {
+    fs_wrapper::create_dir("foo");
+    rustc().input("foo.rs").output("foo").run_fail().assert_stderr_contains(
+        r#"the generated executable for the input file "foo.rs" conflicts with the existing directory "foo""#,
+    );
+}
diff --git a/tests/run-make/output-filename-overwrites-input/Makefile b/tests/run-make/output-filename-overwrites-input/Makefile
deleted file mode 100644
index fe5d231382dcd..0000000000000
--- a/tests/run-make/output-filename-overwrites-input/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	cp foo.rs $(TMPDIR)/foo
-	$(RUSTC) $(TMPDIR)/foo -o $(TMPDIR)/foo 2>&1 \
-		| $(CGREP) -e "the input file \".*foo\" would be overwritten by the generated executable"
-	cp bar.rs $(TMPDIR)/bar.rlib
-	$(RUSTC) $(TMPDIR)/bar.rlib -o $(TMPDIR)/bar.rlib 2>&1 \
-		| $(CGREP) -e "the input file \".*bar.rlib\" would be overwritten by the generated executable"
-	$(RUSTC) foo.rs 2>&1 && $(RUSTC) -Z ls=root $(TMPDIR)/foo 2>&1
-	cp foo.rs $(TMPDIR)/foo.rs
-	$(RUSTC) $(TMPDIR)/foo.rs -o $(TMPDIR)/foo.rs 2>&1 \
-		| $(CGREP) -e "the input file \".*foo.rs\" would be overwritten by the generated executable"
diff --git a/tests/run-make/output-filename-overwrites-input/rmake.rs b/tests/run-make/output-filename-overwrites-input/rmake.rs
new file mode 100644
index 0000000000000..c6055e818a175
--- /dev/null
+++ b/tests/run-make/output-filename-overwrites-input/rmake.rs
@@ -0,0 +1,21 @@
+// If rustc is invoked on a file that would be overwritten by the
+// compilation, the compilation should fail, to avoid accidental loss.
+// See https://github.com/rust-lang/rust/pull/46814
+
+//@ ignore-cross-compile
+
+use run_make_support::{fs_wrapper, rustc};
+
+fn main() {
+    fs_wrapper::copy("foo.rs", "foo");
+    rustc().input("foo").output("foo").run_fail().assert_stderr_contains(
+        r#"the input file "foo" would be overwritten by the generated executable"#,
+    );
+    fs_wrapper::copy("bar.rs", "bar.rlib");
+    rustc().input("bar.rlib").output("bar.rlib").run_fail().assert_stderr_contains(
+        r#"the input file "bar.rlib" would be overwritten by the generated executable"#,
+    );
+    rustc().input("foo.rs").output("foo.rs").run_fail().assert_stderr_contains(
+        r#"the input file "foo.rs" would be overwritten by the generated executable"#,
+    );
+}
diff --git a/tests/run-make/output-with-hyphens/Makefile b/tests/run-make/output-with-hyphens/Makefile
deleted file mode 100644
index 846c9a66a89a0..0000000000000
--- a/tests/run-make/output-with-hyphens/Makefile
+++ /dev/null
@@ -1,8 +0,0 @@
-# ignore-cross-compile
-include ../tools.mk
-
-all:
-	$(RUSTC) foo-bar.rs --crate-type bin
-	[ -f $(TMPDIR)/$(call BIN,foo-bar) ]
-	$(RUSTC) foo-bar.rs --crate-type lib
-	[ -f $(TMPDIR)/libfoo_bar.rlib ]
diff --git a/tests/run-make/output-with-hyphens/rmake.rs b/tests/run-make/output-with-hyphens/rmake.rs
new file mode 100644
index 0000000000000..79deb772bc5df
--- /dev/null
+++ b/tests/run-make/output-with-hyphens/rmake.rs
@@ -0,0 +1,17 @@
+// Rust files with hyphens in their filename should
+// not result in compiled libraries keeping that hyphen -
+// it should become an underscore. Only bin executables
+// should keep the hyphen. This test ensures that this rule
+// remains enforced.
+// See https://github.com/rust-lang/rust/pull/23786
+
+//@ ignore-cross-compile
+
+use run_make_support::{bin_name, path, rust_lib_name, rustc};
+
+fn main() {
+    rustc().input("foo-bar.rs").crate_type("bin").run();
+    assert!(path(bin_name("foo-bar")).exists());
+    rustc().input("foo-bar.rs").crate_type("lib").run();
+    assert!(path(rust_lib_name("foo_bar")).exists());
+}
diff --git a/tests/run-make/parallel-rustc-no-overwrite/rmake.rs b/tests/run-make/parallel-rustc-no-overwrite/rmake.rs
new file mode 100644
index 0000000000000..3f032cf3762a9
--- /dev/null
+++ b/tests/run-make/parallel-rustc-no-overwrite/rmake.rs
@@ -0,0 +1,25 @@
+// When two instances of rustc are invoked in parallel, they
+// can conflict on their temporary files and overwrite each others',
+// leading to unsuccessful compilation. The -Z temps-dir flag adds
+// separate designated directories for each rustc invocation, preventing
+// conflicts. This test uses this flag and checks for successful compilation.
+// See https://github.com/rust-lang/rust/pull/83846
+
+use run_make_support::{fs_wrapper, rustc};
+use std::sync::{Arc, Barrier};
+use std::thread;
+
+fn main() {
+    fs_wrapper::create_file("lib.rs");
+    let barrier = Arc::new(Barrier::new(2));
+    let handle = {
+        let barrier = Arc::clone(&barrier);
+        thread::spawn(move || {
+            barrier.wait();
+            rustc().crate_type("lib").arg("-Ztemps-dir=temp1").input("lib.rs").run();
+        })
+    };
+    barrier.wait();
+    rustc().crate_type("staticlib").arg("-Ztemps-dir=temp2").input("lib.rs").run();
+    handle.join().expect("lib thread panicked");
+}