https://git.ruby-lang.org/ruby.git/commit/?id=121fa24a34

From 121fa24a3451b45c41ac0a661b64e9fc8600e589 Mon Sep 17 00:00:00 2001
From: xtkoba <69125751+xtkoba@u...>
Date: Fri, 30 Apr 2021 21:35:15 +0900
Subject: Adjust struct member offset for i386 Cygwin

Fixes [Bug #17606]
---
 vm_core.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/vm_core.h b/vm_core.h
index 31ac4ac..f21d850 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -218,6 +218,10 @@ struct rb_control_frame_struct; https://github.com/ruby/ruby/blob/trunk/vm_core.h#L218
 /* iseq data type */
 typedef struct rb_compile_option_struct rb_compile_option_t;
 
+#if (SIZEOF_SERIAL_T > SIZEOF_VOIDP) && defined(__CYGWIN__)
+#pragma pack(push, 4) /* == SIZEOF_VOIDP */
+#endif
+
 // imemo_constcache
 struct iseq_inline_constant_cache_entry {
     VALUE flags;
@@ -228,6 +232,10 @@ struct iseq_inline_constant_cache_entry { https://github.com/ruby/ruby/blob/trunk/vm_core.h#L232
                               // v3
 };
 
+#if (SIZEOF_SERIAL_T > SIZEOF_VOIDP) && defined(__CYGWIN__)
+#pragma pack(pop)
+#endif
+
 struct iseq_inline_constant_cache {
     struct iseq_inline_constant_cache_entry *entry;
 };
-- 
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