https://git.ruby-lang.org/ruby.git/commit/?id=64f271241d

From 64f271241d79448ec75040d97df611f86d44ecda Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 9 Sep 2021 15:35:18 +0900
Subject: suppress GCC's -Wnonnull-compare

This particular NULL check must be a good thing to do both statically
and dynamically.
---
 gc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gc.c b/gc.c
index bae2bdd..ac280f1 100644
--- a/gc.c
+++ b/gc.c
@@ -2767,6 +2767,11 @@ rb_data_object_zalloc(VALUE klass, size_t size, RUBY_DATA_FUNC dmark, RUBY_DATA_ https://github.com/ruby/ruby/blob/trunk/gc.c#L2767
     return obj;
 }
 
+COMPILER_WARNING_PUSH
+#if __has_warning("-Wnonnull-compare") || GCC_VERSION_SINCE(6, 1, 0)
+COMPILER_WARNING_IGNORED(-Wnonnull-compare)
+#endif
+
 VALUE
 rb_data_typed_object_wrap(VALUE klass, void *datap, const rb_data_type_t *type)
 {
@@ -2775,6 +2780,8 @@ rb_data_typed_object_wrap(VALUE klass, void *datap, const rb_data_type_t *type) https://github.com/ruby/ruby/blob/trunk/gc.c#L2780
     return newobj_of(klass, T_DATA, (VALUE)type, (VALUE)1, (VALUE)datap, type->flags & RUBY_FL_WB_PROTECTED, sizeof(RVALUE));
 }
 
+COMPILER_WARNING_POP
+
 VALUE
 rb_data_typed_object_zalloc(VALUE klass, size_t size, const rb_data_type_t *type)
 {
-- 
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