https://git.ruby-lang.org/ruby.git/commit/?id=f1dcc3da5d

From f1dcc3da5d89b0a03cbc280e7eafb845d63a1f6a Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Thu, 29 Apr 2021 14:28:08 +0200
Subject: Add RBIMPL_RVALUE_EMBED_LEN_MAX neeeded by internal/bignum.h

* It evaluated to 0 before, revealed by -Wundef
* See [Feature #17752]

Co-authored-by: xtkoba (Tee KOBAYASHI) <xtkoba+ruby@g...>
---
 include/ruby/internal/core/rbasic.h | 5 +++--
 internal/bignum.h                   | 4 ++--
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/ruby/internal/core/rbasic.h b/include/ruby/internal/core/rbasic.h
index a6093c0..aafec24 100644
--- a/include/ruby/internal/core/rbasic.h
+++ b/include/ruby/internal/core/rbasic.h
@@ -37,10 +37,11 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/core/rbasic.h#L37
 
 /** @cond INTERNAL_MACRO */
 #define RBIMPL_EMBED_LEN_MAX_OF(T) \
-    RBIMPL_CAST((int)(sizeof(VALUE[RVALUE_EMBED_LEN_MAX]) / (sizeof(T))))
+    RBIMPL_CAST((int)(sizeof(VALUE[RBIMPL_RVALUE_EMBED_LEN_MAX]) / (sizeof(T))))
 /** @endcond */
 
-enum ruby_rvalue_flags { RVALUE_EMBED_LEN_MAX = 3 };
+#define RBIMPL_RVALUE_EMBED_LEN_MAX 3
+enum ruby_rvalue_flags { RVALUE_EMBED_LEN_MAX = RBIMPL_RVALUE_EMBED_LEN_MAX };
 
 struct
 RUBY_ALIGNAS(SIZEOF_VALUE)
diff --git a/internal/bignum.h b/internal/bignum.h
index aaada45..9b89e61 100644
--- a/internal/bignum.h
+++ b/internal/bignum.h
@@ -83,8 +83,8 @@ https://github.com/ruby/ruby/blob/trunk/internal/bignum.h#L83
 #define BIGNUM_EMBED_LEN_SHIFT \
     (FL_USHIFT+3) /* bit offset of BIGNUM_EMBED_LEN_MASK */
 #ifndef BIGNUM_EMBED_LEN_MAX
-# if (SIZEOF_VALUE*RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT) < (1 << BIGNUM_EMBED_LEN_NUMBITS)-1
-#  define BIGNUM_EMBED_LEN_MAX (SIZEOF_VALUE*RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT)
+# if (SIZEOF_VALUE*RBIMPL_RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT) < (1 << BIGNUM_EMBED_LEN_NUMBITS)-1
+#  define BIGNUM_EMBED_LEN_MAX (SIZEOF_VALUE*RBIMPL_RVALUE_EMBED_LEN_MAX/SIZEOF_ACTUAL_BDIGIT)
 # else
 #  define BIGNUM_EMBED_LEN_MAX ((1 << BIGNUM_EMBED_LEN_NUMBITS)-1)
 # endif
-- 
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