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include/ruby/internal/stdalign.h: add doxygen

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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.
This commit is contained in:
卜部昌平 2021-01-18 19:57:48 +09:00
parent 73d2bf97c1
commit 818fabfcd9
Notes: git 2021-09-10 20:01:53 +09:00 
Merged: https://github.com/ruby/ruby/pull/4815
1 changed files with 4 additions and 2 deletions
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6
include/ruby/internal/stdalign.h
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@ -83,7 +83,9 @@
* @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 {
# * 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