https://git.ruby-lang.org/ruby.git/commit/?id=877bfd1b44

From 877bfd1b44e7b95ea02f6d8805a35093903cd073 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 22 Aug 2021 20:16:44 +0900
Subject: Suppress unused-label warnings

---
 vm_exec.h | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/vm_exec.h b/vm_exec.h
index 1f2a052..10434fc 100644
--- a/vm_exec.h
+++ b/vm_exec.h
@@ -130,9 +130,6 @@ error ! https://github.com/ruby/ruby/blob/trunk/vm_exec.h#L130
 
 #define NEXT_INSN() TC_DISPATCH(__NEXT_INSN__)
 
-#define START_OF_ORIGINAL_INSN(x) start_of_##x:
-#define DISPATCH_ORIGINAL_INSN(x) goto  start_of_##x;
-
 /************************************************/
 #else /* no threaded code */
 /* most common method */
@@ -157,9 +154,11 @@ default:                        \ https://github.com/ruby/ruby/blob/trunk/vm_exec.h#L154
 
 #define NEXT_INSN() goto first
 
-#define START_OF_ORIGINAL_INSN(x) start_of_##x:
-#define DISPATCH_ORIGINAL_INSN(x) goto  start_of_##x;
+#endif
 
+#ifndef START_OF_ORIGINAL_INSN
+#define START_OF_ORIGINAL_INSN(x) if (0) goto start_of_##x; start_of_##x:
+#define DISPATCH_ORIGINAL_INSN(x) goto  start_of_##x;
 #endif
 
 #define VM_SP_CNT(ec, sp) ((sp) - (ec)->vm_stack)
-- 
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