https://git.ruby-lang.org/ruby.git/commit/?id=f108bc32af

From f108bc32af99b0802614c680e43013d828a68d29 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Thu, 29 Apr 2021 15:17:49 +0200
Subject: HAVE_* macros should not be defined with value 0

* See [Feature #17752]
---
 include/ruby/backward/2/attributes.h | 4 ----
 include/ruby/ruby.h                  | 2 +-
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/ruby/backward/2/attributes.h b/include/ruby/backward/2/attributes.h
index eaff9e3..0389f82 100644
--- a/include/ruby/backward/2/attributes.h
+++ b/include/ruby/backward/2/attributes.h
@@ -90,16 +90,12 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/backward/2/attributes.h#L90
 #define ERRORFUNC(mesg, x) RBIMPL_ATTR_ERROR(mesg) x
 #if RBIMPL_HAS_ATTRIBUTE(error)
 # define HAVE_ATTRIBUTE_ERRORFUNC 1
-#else
-# define HAVE_ATTRIBUTE_ERRORFUNC 0
 #endif
 
 #undef WARNINGFUNC
 #define WARNINGFUNC(mesg, x) RBIMPL_ATTR_WARNING(mesg) x
 #if RBIMPL_HAS_ATTRIBUTE(warning)
 # define HAVE_ATTRIBUTE_WARNINGFUNC 1
-#else
-# define HAVE_ATTRIBUTE_WARNINGFUNC 0
 #endif
 
 /*
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index ce5f6c6..341a716 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -72,7 +72,7 @@ VALUE rb_get_path_no_checksafe(VALUE); https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L72
     ((argc) == 0 ? (vargc) <= 1 : /* [ruby-core:85266] [Bug #14425] */ \
      (argc) == (vargc))
 # if defined(HAVE_BUILTIN___BUILTIN_CHOOSE_EXPR_CONSTANT_P)
-#   if HAVE_ATTRIBUTE_ERRORFUNC
+#   ifdef HAVE_ATTRIBUTE_ERRORFUNC
 ERRORFUNC((" argument length doesn't match"), int rb_varargs_bad_length(int,int));
 #   else
 #     define rb_varargs_bad_length(argc, vargc) \
-- 
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