https://git.ruby-lang.org/ruby.git/commit/?id=76d9be9ce9

From 76d9be9ce9c304f3fd59cee7624dbbcea1d2db39 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 1 May 2020 14:12:12 +0900
Subject: Get rid of -Wgnu-zero-variadic-macro-arguments errors

As zero variadic macro argument, `rb_scan_args(argc, argv, "")`
(or `"0"`), means 0-arity method and should be defined so, that
case doesn't need to consider.

diff --git a/include/ruby/3/scan_args.h b/include/ruby/3/scan_args.h
index b1a29f7..409cef9 100644
--- a/include/ruby/3/scan_args.h
+++ b/include/ruby/3/scan_args.h
@@ -380,7 +380,7 @@ rb_scan_args_set(int kw_flag, int argc, const VALUE *argv, https://github.com/ruby/ruby/blob/trunk/include/ruby/3/scan_args.h#L380
             argc, argvp, fmt,                                 \
             (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
             ((VALUE*[]){__VA_ARGS__})),                       \
-        (rb_scan_args)(argc, argvp, fmt, ## __VA_ARGS__))
+        (rb_scan_args)(argc, argvp, fmt, __VA_ARGS__))
 # define rb_scan_args_kw(kw_flag, argc, argvp, fmt, ...)      \
     __builtin_choose_expr(                                    \
         __builtin_constant_p(fmt),                            \
@@ -388,7 +388,7 @@ rb_scan_args_set(int kw_flag, int argc, const VALUE *argv, https://github.com/ruby/ruby/blob/trunk/include/ruby/3/scan_args.h#L388
             kw_flag, argc, argvp, fmt,                        \
             (sizeof((VALUE*[]){__VA_ARGS__})/sizeof(VALUE*)), \
             ((VALUE*[]){__VA_ARGS__})),                       \
-        (rb_scan_args_kw)(kw_flag, argc, argvp, fmt, ## __VA_ARGS__))
+        (rb_scan_args_kw)(kw_flag, argc, argvp, fmt, __VA_ARGS__ /**/))
 #endif
 
 #endif /* RUBY3_SCAN_ARGS_H */
-- 
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