From 58156c5cab242898ab0130b7a428b7e14bf3a066 Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Sat, 24 Jan 2026 11:45:53 -0500
Subject: [PATCH] Fix segfault related to __builtin_unreachable with inline asm

---
 src/asm.rs                        |  4 +---
 tests/run/unreachable-function.rs | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 tests/run/unreachable-function.rs

diff --git a/src/asm.rs b/src/asm.rs
index ceb3dd3ffedf..319f3d327873 100644
--- a/src/asm.rs
+++ b/src/asm.rs
@@ -575,9 +575,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         }
         if dest.is_none() && options.contains(InlineAsmOptions::NORETURN) {
             let builtin_unreachable = self.context.get_builtin_function("__builtin_unreachable");
-            let builtin_unreachable: RValue<'gcc> =
-                unsafe { std::mem::transmute(builtin_unreachable) };
-            self.call(self.type_void(), None, None, builtin_unreachable, &[], None, None);
+            self.llbb().add_eval(None, self.context.new_call(None, builtin_unreachable, &[]));
         }
 
         // Write results to outputs.
diff --git a/tests/run/unreachable-function.rs b/tests/run/unreachable-function.rs
new file mode 100644
index 000000000000..0a975487dd78
--- /dev/null
+++ b/tests/run/unreachable-function.rs
@@ -0,0 +1,27 @@
+// Compiler:
+//
+// Run-time:
+//   status: 0
+
+use std::arch::asm;
+
+fn exit_syscall(status: i32) -> ! {
+    #[cfg(target_arch = "x86_64")]
+    unsafe {
+        asm!(
+            "syscall",
+            in("rax") 60,
+            in("rdi") status,
+            options(noreturn)
+        );
+    }
+
+    #[cfg(not(target_arch = "x86_64"))]
+    std::process::exit(status);
+}
+
+fn main() {
+    // Used to crash with rustc_codegen_gcc.
+    exit_syscall(0);
+    std::process::exit(1);
+}