From 3a58869e87d22caec4818e780adc42a7de67521e Mon Sep 17 00:00:00 2001
From: Andrea Corallo <acorallo@gnu.org>
Date: Sat, 18 May 2024 08:59:17 +0200
Subject: [PATCH] * Work around GCC bug affecting Garbage Collection
 (bug#65727).

* src/lisp.h (flush_stack_call_func): Prevent GCC sibling call
optimization to run with an asm inline.

(cherry picked from commit 19c983ddedf083f82008472c13dfd08ec94b615f)
---
 src/lisp.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lisp.h b/src/lisp.h
index 41f8af35e8a..8ee37f5298a 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -4479,6 +4479,12 @@ flush_stack_call_func (void (*func) (void *arg), void *arg)
 {
   __builtin_unwind_init ();
   flush_stack_call_func1 (func, arg);
+  /* Work around GCC sibling call optimization making
+     '__builtin_unwind_init' ineffective (bug#65727).
+     See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115132>.  */
+#if defined __GNUC__ && !defined __clang__
+  asm ("");
+#endif
 }
 
 extern void garbage_collect (void);
-- 
2.39.5