https://git.ruby-lang.org/ruby.git/commit/?id=818fabfcd9

From 818fabfcd96898192ab9de3cb31fc424bcd167c6 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: Mon, 18 Jan 2021 19:57:48 +0900
Subject: include/ruby/internal/stdalign.h: add doxygen

Unlike other "add doxygen" commits this one adds a preprocessor branch
that doxygen would process.  This prevents it from parsing other parts
of the file.
---
 include/ruby/internal/stdalign.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/ruby/internal/stdalign.h b/include/ruby/internal/stdalign.h
index dbc2784..ec68f6a 100644
--- a/include/ruby/internal/stdalign.h
+++ b/include/ruby/internal/stdalign.h
@@ -83,7 +83,9 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/stdalign.h#L83
  * @see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560
  * @see https://bugs.llvm.org/show_bug.cgi?id=26547
  */
-#if defined(__cplusplus)
+#if defined(__DOXYGEN__)
+# define RBIMPL_ALIGNOF alignof
+#elif defined(__cplusplus)
 # /* C++11 `alignof()` can be buggy. */
 # /* see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560 */
 # /* But don't worry, we can use templates. */
@@ -117,7 +119,7 @@ struct rbimpl_alignof { https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/stdalign.h#L119
 #  * There are 2 known pitfalls for this fallback implementation:
 #  *
 #  * First, it is either an undefined  behaviour (C) or an explicit error (C++)
-#  * to define a  struct inside of `offsetof`. C compilers  tend to accept such
+#  * to define a  struct inside of `offsetof`.  C compilers  tend to accept such
 #  * things, but AFAIK C++ has no room to allow.
 #  *
 #  * Second, there exist T  such that `struct { char _; T t;  }` is invalid.  A
-- 
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