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add #include guard hack

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According to MSVC manual (*1), cl.exe can skip including a header file
when that:

- contains #pragma once, or
- starts with #ifndef, or
- starts with #if ! defined.

GCC has a similar trick (*2), but it acts more stricter (e. g. there
must be _no tokens_ outside of #ifndef...#endif).

Sun C lacked #pragma once for a looong time.  Oracle Developer Studio
12.5 finally implemented it, but we cannot assume such recent version.

This changeset modifies header files so that each of them include
strictly one #ifndef...#endif.  I believe this is the most portable way
to trigger compiler optimizations. [Bug #16770]

*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
This commit is contained in:
卜部昌平 2020-04-10 14:11:40 +09:00
parent a3f6f67967
commit 4ff3f20540
Notes: git 2020-04-13 16:06:29 +09:00
255 changed files with 1141 additions and 1038 deletions
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31
include/ruby/version.h
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@ -1,17 +1,17 @@
/**********************************************************************
ruby/version.h -
$Author$
created at: Wed May 13 12:56:56 JST 2009
Copyright (C) 1993-2009 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
/*
#ifndef RUBY_VERSION_H /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_VERSION_H 1
/**
* @file
* @author $Author$
* @date Wed May 13 12:56:56 JST 2009
* @copyright Copyright (C) 1993-2009 Yukihiro Matsumoto
* @copyright Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
* @copyright Copyright (C) 2000 Information-technology Promotion Agency, Japan
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
*
* This file contains only
* - never-changeable information, and
* - interfaces accessible from extension libraries.
@ -20,9 +20,6 @@
* check the features with mkmf.rb instead.
*/
#ifndef RUBY_VERSION_H
#define RUBY_VERSION_H 1
/* The origin. */
#define RUBY_AUTHOR "Yukihiro Matsumoto"
#define RUBY_BIRTH_YEAR 1993