Unrolled build for rust-lang#125573

Rollup merge of rust-lang#125573 - GuillaumeGomez:migrate-allow-warnings-cmdline-stability, r=jieyouxu

Migrate `run-make/allow-warnings-cmdline-stability` to `rmake.rs`

Part of rust-lang#121876.

r? ``@jieyouxu``

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

@@ -268,6 +268,17 @@ pub fn recursive_diff(dir1: impl AsRef<Path>, dir2: impl AsRef<Path>) {
     }
 }
 
+/// Check that `haystack` does not contain `needle`. Panic otherwise.
+pub fn assert_not_contains(haystack: &str, needle: &str) {
+    if haystack.contains(needle) {
+        eprintln!("=== HAYSTACK ===");
+        eprintln!("{}", haystack);
+        eprintln!("=== NEEDLE ===");
+        eprintln!("{}", needle);
+        panic!("needle was unexpectedly found in haystack");
+    }
+}
+
 /// Implement common helpers for command wrappers. This assumes that the command wrapper is a struct
 /// containing a `cmd: Command` field and a `output` function. The provided helpers are:
 ///

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -1,6 +1,5 @@
 run-make/allocator-shim-circular-deps/Makefile
 run-make/allow-non-lint-warnings-cmdline/Makefile
-run-make/allow-warnings-cmdline-stability/Makefile
 run-make/archive-duplicate-names/Makefile
 run-make/atomic-lock-free/Makefile
 run-make/bare-outfile/Makefile

tests/run-make/allow-warnings-cmdline-stability/rmake.rs

@@ -0,0 +1,11 @@
+// Test that `-Awarnings` suppresses warnings for unstable APIs.
+
+use run_make_support::{assert_not_contains, rustc};
+
+fn main() {
+    rustc().input("bar.rs").run();
+    let output = rustc().input("foo.rs").arg("-Awarnings").run();
+
+    assert_not_contains(&String::from_utf8(output.stdout).unwrap(), "warning");
+    assert_not_contains(&String::from_utf8(output.stderr).unwrap(), "warning");
+}