https://git.ruby-lang.org/ruby.git/commit/?id=7c07300491

From 7c07300491de502cd94e07fcbf9b30f2df31a0d5 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: Tue, 5 Nov 2019 13:46:08 +0900
Subject: let the .bss section initialize static variables

ISO/IEC 9899:1999 section 6.7.8 specifies the values of static
storage which are not explicitly initialized.  According to that
these initializers can be omitted.  Doing so improvoes future
compatibility against addition / deletion of the fields of this
struct.

diff --git a/internal.h b/internal.h
index 0c245c3..703dd57 100644
--- a/internal.h
+++ b/internal.h
@@ -2395,12 +2395,12 @@ RUBY_FUNC_NONNULL(1, bool rb_method_basic_definition_p_with_cc(struct rb_call_da https://github.com/ruby/ruby/blob/trunk/internal.h#L2395
 #ifdef __GNUC__
 # define rb_funcallv(recv, mid, argc, argv) \
     __extension__({ \
-        static struct rb_call_data rb_funcallv_data = { { 0, }, { 0, }, }; \
+        static struct rb_call_data rb_funcallv_data; \
         rb_funcallv_with_cc(&rb_funcallv_data, recv, mid, argc, argv); \
     })
 # define rb_method_basic_definition_p(klass, mid) \
     __extension__({ \
-        static struct rb_call_data rb_mbdp = { { 0, }, { 0, }, }; \
+        static struct rb_call_data rb_mbdp; \
         (klass == Qfalse) ? /* hidden object cannot be overridden */ true : \
             rb_method_basic_definition_p_with_cc(&rb_mbdp, klass, mid); \
     })
-- 
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