From 2453a68ad4d679788ad87f96f8219d4980e8d4e7 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Fri, 17 Jul 2026 17:49:21 -0400
Subject: [PATCH 1/2] Add command to run specified UI tests

---
 build_system/src/test.rs | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/build_system/src/test.rs b/build_system/src/test.rs
index c7f104ca4ca..fcbc09b2708 100644
--- a/build_system/src/test.rs
+++ b/build_system/src/test.rs
@@ -28,6 +28,7 @@ fn get_runners() -> Runners {
         ("Run failing ui pattern tests", test_failing_ui_pattern_tests),
     );
     runners.insert("--test-failing-rustc", ("Run failing rustc tests", test_failing_rustc));
+    runners.insert("--run-ui-tests", ("Run specified rustc UI tests", run_ui_tests));
     runners.insert("--projects", ("Run the tests of popular crates", test_projects));
     runners.insert("--test-libcore", ("Run libcore tests", test_libcore));
     runners.insert("--alloc-tests", ("Run alloc tests", test_alloc));
@@ -1218,6 +1219,45 @@ fn test_failing_ui_pattern_tests(env: &Env, args: &TestArg) -> Result<(), String
     )
 }
 
+fn run_ui_tests(env: &Env, args: &TestArg) -> Result<(), String> {
+    let mut env = env.clone();
+    let rust_path = setup_rustc(&mut env, args)?;
+
+    let extra =
+        if args.is_using_gcc_master_branch() { "" } else { " -Csymbol-mangling-version=v0" };
+
+    let rustc_args = format!(
+        "{test_flags} -Zcodegen-backend={backend} --sysroot {sysroot}{extra}",
+        test_flags = env.get("TEST_FLAGS").unwrap_or(&String::new()),
+        backend = args.config_info.cg_backend_path,
+        sysroot = args.config_info.sysroot_path,
+        extra = extra,
+    );
+
+    env.get_mut("RUSTFLAGS").unwrap().clear();
+
+    let mut command: Vec<&dyn AsRef<OsStr>> = vec![
+        &"./x.py",
+        &"test",
+        &"--run",
+        &"always",
+        &"--stage",
+        &"0",
+        &"--set",
+        &"build.compiletest-allow-stage0=true",
+        &"--compiletest-rustc-args",
+        &rustc_args,
+        &"--bypass-ignore-backends",
+    ];
+
+    for test_name in &args.test_args {
+        command.push(test_name);
+    }
+
+    run_command_with_output_and_env(&command, Some(&rust_path), Some(&env))?;
+    Ok(())
+}
+
 fn retain_files_callback<'a>(
     file_path: &'a str,
     test_type: &'a str,

From d5ed2d4b20de839b4fe7bf9924151629be36826d Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Fri, 17 Jul 2026 17:49:54 -0400
Subject: [PATCH 2/2] Implement stack protector

---
 src/gcc_util.rs            | 9 ++++++++-
 tests/failing-ui-tests.txt | 1 -
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/gcc_util.rs b/src/gcc_util.rs
index 2615d93e427..79bbb8a72df 100644
--- a/src/gcc_util.rs
+++ b/src/gcc_util.rs
@@ -7,7 +7,7 @@ use gccjit::Version;
 use rustc_codegen_ssa::target_features;
 use rustc_data_structures::smallvec::{SmallVec, smallvec};
 use rustc_session::Session;
-use rustc_target::spec::{Arch, RelocModel};
+use rustc_target::spec::{Arch, RelocModel, StackProtector};
 
 fn gcc_features_by_flags(sess: &Session, features: &mut Vec<String>) {
     target_features::retpoline_features_by_flags(sess, features);
@@ -204,6 +204,13 @@ pub fn new_context<'gcc>(sess: &Session) -> Context<'gcc> {
         });
     }
 
+    match sess.stack_protector() {
+        StackProtector::All => context.add_command_line_option("-fstack-protector-all"),
+        StackProtector::Strong => context.add_command_line_option("-fstack-protector-strong"),
+        StackProtector::Basic => context.add_command_line_option("-fstack-protector"),
+        StackProtector::None => (),
+    }
+
     add_pic_option(&context, sess.relocation_model());
 
     let target_cpu = target_cpu(sess);
diff --git a/tests/failing-ui-tests.txt b/tests/failing-ui-tests.txt
index 5d55ad31d1e..97a58cc89af 100644
--- a/tests/failing-ui-tests.txt
+++ b/tests/failing-ui-tests.txt
@@ -106,6 +106,5 @@ tests/ui/eii/static/default_cross_crate_explicit.rs
 tests/ui/explicit-tail-calls/tailcc-no-signature-restriction.rs
 tests/ui/abi/rust-tail-cc.rs
 tests/ui/abi/rust-preserve-none-cc.rs
-tests/ui/abi/stack-protector.rs
 tests/ui/extern/extern-types-field-offset.rs
 tests/ui/abi/stack-probes-lto.rs