https://git.ruby-lang.org/ruby.git/commit/?id=83f9183a7e

From 83f9183a7e549b0d7e6b68e298d57744ddb4d97f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 31 May 2019 14:05:01 +0900
Subject: Also GCC 9 provides -Waddress-of-packed-member


diff --git a/eval_intern.h b/eval_intern.h
index f4a48d8..ad74408 100644
--- a/eval_intern.h
+++ b/eval_intern.h
@@ -158,7 +158,7 @@ LONG WINAPI rb_w32_stack_overflow_handler(struct _EXCEPTION_POINTERS *); https://github.com/ruby/ruby/blob/trunk/eval_intern.h#L158
 #endif
 
 #if defined(USE_UNALIGNED_MEMBER_ACCESS) && USE_UNALIGNED_MEMBER_ACCESS && \
-    defined(__clang__)
+    (defined(__clang__) || GCC_VERSION_SINCE(9, 0, 0))
 # define UNALIGNED_MEMBER_ACCESS(expr) __extension__({ \
     COMPILER_WARNING_PUSH; \
     COMPILER_WARNING_IGNORED(-Waddress-of-packed-member); \
-- 
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